CN107446589A - A kind of acid soil cadmium passivator and its application - Google Patents
A kind of acid soil cadmium passivator and its application Download PDFInfo
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- CN107446589A CN107446589A CN201710812496.6A CN201710812496A CN107446589A CN 107446589 A CN107446589 A CN 107446589A CN 201710812496 A CN201710812496 A CN 201710812496A CN 107446589 A CN107446589 A CN 107446589A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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Abstract
The invention discloses a kind of acid soil cadmium passivator, composition includes rice hull carbon, lime, hydroxyapatite, bloodstone.Acid soil cadmium passivator of the present invention can improve soil pH, reduce CaCl2With the content of Acetic acid extraction cadmium, Cadmium in Soil is promoted to be converted from bioavailable state (ion-exchange state) to potential using state (carbonate combine state, iron and manganese oxides reference state) and not using state (residual form), reach the purpose of passivation Cd activity, effectively repair Cd pollution acid soils, promote plant growth, reduce absorption of the crop to cadmium.
Description
Technical field
The present invention relates to heavy-metal contaminated soil repair field, relate in particular to a kind of acid soil cadmium passivator and its
Using.
Background technology
Heavy metal can not be degraded by microorganisms in nature, thus its enter soil environment after can persistently exist.2014
National environmental protection portion and Ministry of Land and Resources's issue《National Soil Pollution Investigation publication》Show, the following points of contamination position of severe
Exceeded ratio reaches 15%, and wherein cadmium turns into primary pollutant in China's arable soil, and point position exceeding standard rate is 7%.Large area
Soil pollution not only threatens 1,800,000,000 mu of arable land red lines, and influences health and social stability.
Chemical stabilization method is by adding passivating material into contaminated soil, reducing effective work of heavy metal in soil
Property, reduce plant heavy metal absorption, it is possible to achieve heavy metal pollution agricultural land soil while production, while repair purpose.The party
Method is simple to operate, cost is low, applied widely, be current heavy metal pollution farmland repair promote mainly restorative procedure.
Have a scholar's research discovery, single passivating material heavy metal has selectivity, exist passivation effect it is unstable with
And the problems such as destroying soil quality.As chronic administration lime can cause soil hardening, cause the elements such as calcium and magnesium unbalance, reduce soil
Arability.Therefore, it is necessary to screen and assemble economic, efficient and effect stability passivator.
The content of the invention
The technical problems to be solved by the invention, which are to provide one kind, can significantly reduce acid soil cadmium activity, improve soil
PH acid soil cadmium passivator.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：A kind of acid soil cadmium passivator, composition
Including rice hull carbon, lime, hydroxyapatite, bloodstone.
Rice hull carbon can adsorb Cd on its pore interior and surface, can also reduce Cd work by being complexed and precipitating
Property；In addition, rice hull carbon is alkalescence, being capable of the faint pH for improving soil；Moreover, containing certain ash content in rice hull carbon, it is rich in
Si, Ca, Mg, Fe etc., there is preferable effect for improving acid soil available state calcium and magnesium.
Lime can not only significantly improve soil pH value, while can also react (Cd with Cd2++CO3 2-=CdCO3；Cd2++
2OH-=Cd (OH)2) form carbonate and hydroxide precipitation.
Hydroxyapatite can act on (3Cd by ion exchange, surface complexation, co-precipitation etc.2++2PO4 3-=Cd3
(PO4)2) Adsorption of Cadmium.
Bloodstone is one kind of soil ferriferous oxide, itself is a kind of material for being advantageous to alleviate soil acidification, for
Phosphate and heavy metal are respectively provided with certain absorption crystallized ability, and its iron phosphorus formed with phosphorus also can react (Fe with Cd3
(PO4)2·8H2O+2H+=3Fe2++2HPO4 2-+8H2O；3Cd2++2HPO4 2-=Cd3(PO4)2+2H+) generation slightly solubility precipitation.
Further, rice hull carbon and the weight ratio of lime, hydroxyapatite, bloodstone are 35:35:20:10.Implementing this
During invention, inventor has found, the acid soil cadmium passivator under said ratio reaches optimal to the passivation effect of cadmium.
Further, composition also includes active silica flour and fertile soil.
Further, the active silica flour, which is prepared as follows, forms：Calcium hydroxide, silica and water are mixed,
Filtered off after hydro-thermal reaction except supernatant, obtained precipitation is the active silica flour after calcination processing.
Further, the fertile soil, which is prepared as follows, forms：Pollution-free soil is gathered, by pollution-free soil and excrement
Fertilizer, agricultural crop straw mixing, then add urea, add EM bacterium dilutions, the fertile soil is obtained after fermentation process.
Active silica flour reacts to form silicate precipitates under the organic egency in fertile soil and soil with heavy metal, reaches
Reduce the purpose of heavy metal activity；Fertile soil has the function that to improve soil organic nutrient, additionally it is possible to is formed and chelated with heavy metal
Thing, reduces the bioactivity of cadmium, and improves soil microbial activities.In implementing the present invention, it may, inventor has found, lime
Assembled with humus and be significantly higher than the passivation effect of single lime or fertile soil to cadmium to the passivation effect of cadmium, and with organic and
It is inorganic to assemble, soil pH can not only be improved, reduces cadmium activity, soil nutrient level can also be improved, realize crop heavy metal
Low absorption and yield increase.
Further, rice hull carbon and lime, hydroxyapatite, bloodstone, active silica flour, weight humous ratio be 25~
35:25~35:18~22:6~10:5~9:4~6.In implementing the present invention, it may, inventor has found, under said ratio
Acid soil cadmium passivator reaches optimal to the passivation effect of cadmium, and can effectively improve the pH of acid soil, eliminates soil
It is hardened, ensure the element balances such as calcium and magnesium, improve soil arability, and with relatively low phosphorus release risk.
The preparation method of above-mentioned acid soil cadmium passivator, comprises the following steps：Pulverization process is carried out respectively to each composition,
Then it is homogenously mixed together, obtains the acid soil cadmium passivator.
The present invention also provides a kind of acidic cadmium polluted soil restorative procedure, comprises the following steps：By above-mentioned acid soil cadmium
Passivator is well mixed with contaminated soil, and acid soil cadmium passivator dosage is the 0.2%~0.4% of contaminated soil weight, it
Afterwards according to 70% plus water of contaminated soil maximum water-holding capacity, finally balance more than two days.
The present invention also provides a kind of acidic cadmium polluted arable land restorative procedure, comprises the following steps：Smooth arable land, is ploughed in 20cm
Layer soil applies above-mentioned acid soil cadmium passivator, turns over processing afterwards.
Further, the amount of application of acid soil cadmium passivator is 450~600kg/667m2。
Beneficial effects of the present invention are embodied in：
Acid soil cadmium passivator of the present invention can improve the pH of acid soil, reduce CaCl2With Acetic acid extraction cadmium
Content, promote Cadmium in Soil from bioavailable state (ion-exchange state) to potential using state (carbonate combine state, Fe-Mn oxidation
Thing reference state) and do not converted using state (residual form), reach the purpose of passivation Cd activity, effectively repair Cd pollution acid soils
Earth, promote plant growth, reduce absorption of the crop to cadmium.
The present invention can either solve the problems, such as agricultural organic waste recycling, and and can enough realizes the passivation of heavy metal
Effect, technical support is provided for the stabilisation reparation of acid heavy metal contaminated soil and safe utilization.
Acidic cadmium polluted soil restorative procedure of the present invention and acidic cadmium polluted arable land restorative procedure can make full use of acidity
The passivation of Cadmium in Soil passivator, can either reduce passivator dosage, and and can enough ensures cadmium repairing effect.
Brief description of the drawings
Fig. 1 is the schematic diagram influenceed using the acid buffer capacity of potting soil after passivator.
Embodiment
The present invention is described in detail with reference to embodiment.This part to the material that arrives used in present invention experiment and
Experimental method carries out general description.Although to realize that many materials used in the object of the invention and operating method are abilities
Known to domain, but the present invention is described in detail as far as possible herein.It will be apparent to those skilled in the art that hereinafter, if not special
Do not mentionlet alone bright, material therefor, equipment and operating method of the present invention are well known in the art.Different materials are described as follows used in experiment：
Rice hull carbon is that rice husk is prepared through low temperature pyrogenation, pH=8.37, organic 418g/kg, full P=1.26g/kg, full N=
8.35g/kg, full Cd=0.13mg/kg；
Lime, pH 12.3, CaO content 15.6%；
Potassium dihydrogen phosphate is purchased from Chemical Reagent Co., Ltd., Sinopharm Group, purity 99.5%.
Hydroxyapatite is purchased from Nanjing Ai Purui nano materials Co., Ltd, purity 96%, pH=7.23；
Bloodstone (α-Fe2O3) it is purchased from Nanjing Ai Purui nano materials Co., Ltd, purity 99.5%, specific surface area
38.6m2/g；
Embodiment 1
The preparation of acid soil cadmium passivator
For overcome the deficiencies in the prior art, the present invention provides a kind of acid soil cadmium for being used to repair acid soil cadmium pollution
Passivator, its composition include rice hull carbon, lime, hydroxyapatite, bloodstone, rice hull carbon and lime, hydroxyapatite, bloodstone
Weight ratio be 35:35:20:10, in addition on the basis of above-mentioned four kinds of compositions, active silica flour and fertile soil two can also be increased
Kind composition, after increasing both compositions, rice hull carbon and lime, hydroxyapatite, bloodstone, active silica flour, weight humous
Than for 25~35:25~35:18~22:6~10:5~9:4~6.
Wherein, active silica flour, is prepared as follows and forms：Calcium hydroxide aqueous solution and silica are rubbed according to calcium silicon
You are than being 1:1 ratio mixes, and is filtered off after hydro-thermal reaction 24h except supernatant, gained is deposited at 1000~1200 DEG C and calcined
10~15 hours, active silica flour is obtained, obtains active silica flour SiO2Content 45.3%.
Fertile soil, it is prepared as follows and forms：The pollution-free soil of topsoil 20cm is gathered, according to pollution-free soil quality:
Muck (in the livestock and poultry muck such as chicken manure fertilizer, cow and bullock manure, sheep manure any one or more):Agricultural crop straw (it is crushed to 1~
2cm)=6:2:2 ratio mixes pollution-free soil quality, muck and agricultural crop straw, then adds urea, makes gained mixed
Compound C/N=30, EM bacterium dilution (EM bacterium stostes are diluted with water 80 times) is eventually adding, it is 35% to make final material water content,
Plastic foil covers, and fermentation obtains the fertile soil after 3 weeks.
Rice hull carbon and fertile soil pulverized 40 mesh sieves respectively, and other compositions were crushed to 100 mesh sieves, and each composition uniformly mixes
Together, that is, the acid soil cadmium passivator is obtained.Several specific formulas composition of acid soil cadmium passivator is provided below,
Refer to table 1.
The formula composition of the acid soil cadmium passivator of table 1
Embodiment 2
Acid soil cadmium repairing test
The present embodiment is for trying using Jiangxi Province Guixi City Guixi Smelter periphery fountain village heavy metal pollution agricultural land soil
Cadmium pollution acid soil sample, soil pH=5.16, CEC=9.29cmol/kg, organic matter=21.7g/kg, rapid available phosphorus=
53.1mg/kg, alkali-hydrolyzable nitrogen=115mg/kg, full cadmium=1.17mg/kg, full copper=124mg/kg, full lead=80.5mg/kg；Soil
Cadmium content is light between (containing) in 1 times to 3 times of China's soil environment quality secondary standard (GB 15618-1995) in earth
Degree pollution；Soil cadmium content is intermediate pollution between 3 times to 5 times (containing).
Test procedure：Take 1kg to cross the confession of 10 mesh sieves and try cadmium pollution acid soil sample in plastic beaker, then add acidity
Cadmium in Soil passivator, is stirred, and deionized water is added according to the 70% of soil maxmun field capacity, then in constant temperature
In case 25 DEG C it is incubated.Balance 5 days, sampling, air-dry, grinding post analysis soil pH, 0.01mol/L CaCl are respectively adopted2It is molten
The leachability of liquid and solid waste Leaching leaching method hac buffer method (HJ/T300-2007) test Cd.
Meanwhile a space management (CK) for not adding acid soil cadmium passivator and eight addition contrast passivator are set
Reference is done in DS1-8 processing；Contrast passivator DS1-8 composition is shown in Table 2.Acid soil cadmium repairing test the results are shown in Table 3.
Table 2 contrasts the composition of passivator (DS1-8)
Soil pH, CaCl after the processing of the passivator of table 32Change with acid extractable cadmium, water extraction phosphorus and rapid available phosphorus
As a result show：
(1) as passivator dosage from 0.2% increases to 0.4%, soil pH dramatically increases, such as 3# passivator, soil pH
6.11 increased to from the 5.48 of 0.2% dosage under 0.4% dosage.4# passivator is best to soil pH raising effect, relatively compares
Improve 0.94 unit；Next to that 1# passivator, improves 0.9 unit；Passivator DS6 effect is worst, 0.4% dosage
Under improve only 0.45 unit.Meanwhile 0.4% dosage 1#, 2#, 3# and 4# passivator to CaCl2Extraction state and acetic acid carry
State Cd range of decrease highest, respectively 74.9-81.7% and 36.1-39.9% are taken, contrast passivator effect is poor, wherein DS6 pairs
CaCl2The range of decrease for extracting state and Acetic acid extraction Cd is only 53.5% and 19.9%.
(2) as the increase of passivator dosage, the content of soil water extraction phosphorus dramatically increase, as soil water extraction phosphorus content with
558mg/kg of the passivator DS4 dosages from 0.2% 258mg/kg increases by 0.4%.Meanwhile all places containing hydroxyapatite
Reason, the content of water extraction phosphorus are below the processing containing potassium dihydrogen phosphate.In addition, with the addition of bloodstone, soil water extraction phosphorus
Content significantly reduces, and the processing available phosphorus content containing hydroxyapatite and bloodstone further reduces.Such as 0.4% dosage
DS7 is compared with DS4, and water extraction phosphorus reduces 10.4%, and passivator 5# reduces 97.9% compared with DS7 water extraction phosphorus.It is identical with water extraction phosphorus, soil
Rapid available phosphorus increases also with the increase of passivator dosage, but increased amplitude is substantially less than water extraction phosphorus.Equally, containing phosphoric acid
The content of the processing available phosphorus of potassium dihydrogen is higher than the processing of hydroxyapatite.Because water extraction phosphorus is to the wind of earth's surface body eutrophication
Danger is larger, therefore after soluble phosphate (potassium dihydrogen phosphate) processing heavy-metal contaminated soil, the risk of phosphorus release is noticeably greater than
Slightly solubility (hydroxyapatite) phosphate.Passivator rich in bloodstone and hydroxyapatite is better than containing to Cd passivation effect
The processing of potassium dihydrogen phosphate and bloodstone, and discharged with less phosphorus.From the point of view of the dosage of addition, passivator dosage 0.3-
0.4% is relatively more reasonable, according to agricultural land soil unit weight 1.3g/cm3, every mu of topsoil 20cm soil dosage is 450-600kg.
Embodiment 3
Indoor pot is tested
The present embodiment uses the water of Changsha, Hunan Changsha County Beishan Mountain town Rong Heqiao communities Xiang Tian gulfs industrial wastewater pollution
Rice soil is for examination cadmium pollution acid soil sample, soil pH=5.2, CEC=13.9cmol/kg, organic matter=24.8g/kg, speed
Effect phosphorus=28.9mg/kg, alkali-hydrolyzable nitrogen=140mg/kg, full copper=52.4mg/kg, full cadmium=0.92mg/kg, full lead=
61.4mg/kg。
Experimental procedure：2g passivator is well mixed with 500g for examination cadmium pollution acid soil sample, i.e., passivator accounts for soil
The 0.4% of earth weight.70% according to soil maxmun field capacity adds deionized water, and balance sows rye grass 20 after 5 days
Grain, experiment totally 5 processing, each handles 3 repetitions.The thinning after rye grass seedling emergence 1 week, seedling 10 is stayed per basin rye grass
Strain.In after planting the 45th day collection sample of rye grass, rye grass fresh weight and Cd uptake amount, soil pH and calcium chloride extraction state are determined
Cadmium (is shown in Table 4), while carries out acid-base titration experiment to soil, investigates its acid buffer capacity (see Fig. 1).
Potted plant with passivator is respectively 1#, 3#, and sets one and do not add passivator, as control treatment CK, and it is right
Than passivator DS1, DS3, DS4, DS8 reference.
The rye grass biomass of table 4 and Cd uptakes
As a result show：
Passivator 1# and 3# processing are best to the raising effect of rye grass aerial part and root biomass, relatively compare respectively
Improve 0.42 and 0.41 times.In addition, passivator 1# and 3# processing significantly reduce rye grass aerial part and root compared with comparative example
The content of portion's cadmium, as passivator 1# processing rye grass aerial part Cd contents reduce 47.2% compared with CK；Meanwhile passivator 1# and
3# processing soil pHs improve 0.57 and 0.54 unit compared with CK processing respectively.
In addition, passivator 1# and 3# processing soil CaCl2It is minimum to extract state Cd contents, reduces 69.6% He compared with CK respectively
67.6%.Passivator 1# and 3# the processing water extraction phosphorus content handled containing hydroxyapatite and bloodstone is minimum, and content is not as good as DS4
Handle the 1% of water extraction phosphorus.Although 1# and 3# processing available phosphorus contents are less than the processing containing potassium dihydrogen phosphate, its content is high
In CK.
Soil acid-base buffer curve shows (Fig. 1) after different passivator processing, after different passivator processing between each sample
Buffer capacity differs greatly, and the addition of generally passivator improves the acid buffer capacity of soil, and at passivator 1# and 3#
The acid buffer capacity of reason be higher than other comparative examples so, passivator 1# and 3# not only can effectively be passivated Cadmium in Soil activity, improve
Soil pH and available phosphorus content, and there is stronger acids buffer capacity, there is preferable application potential in Red Soils in Southern China area.
Embodiment 4
Field rice drop cadmium experiment
Field experiment is arranged in south of the River village of Guixi City Binjiang township, the ground is apart from smeltery southeastern direction 8.0km or so.Cell
Length × wide=5.0m × 4.0m, each cell surrounding have 50cm ridge, polyethylene plastic film, vinyon are covered on ridge
Film is embedded to 50~60cm of underground, prevents exchange of moisture being present between neighbor cell.There is wide 50cm between adjacent two rows cell, it is deep
50cm ditch, pours water and draining for cell.Soil pH=5.45, CEC=11.3cmol/kg, organic matter=28.9g/kg,
Rapid available phosphorus=37.2mg/kg, full copper=79.4mg/kg, full cadmium=0.82mg/kg.It is that five excellent China account for for examination rice varieties.
Test procedure：Soil is arranged first, spreads fertilizer over the fields passivator according to dosage, then turned over rotary cultivator,
Rice cultivation rice shoot after stirring, fertilising and irrigation.Rice and in July, 2016 are planted, and rice yield and not is determined after November harvest
With position Cd uptake amount (table 5), while determine soil pH, water extraction phosphorus and rapid available phosphorus, CaCl2Extract state cadmium (table 6) and do not assimilate
Learn form cadmium content (table 7).
Crop field is respectively 1#, 3# with passivator, and sets a conduct control treatment CK for not adding passivator and one
Add the conduct control treatment S of single lime, and contrast passivator DS1, DS3, DS4, DS8 reference.Wherein, 1#, 3# with
And 0.3% (the 450kg/ mus) that contrast passivator DS1, DS3, DS4, DS8 dosage are top layer 20cm soil qualities, control treatment S
In, lime consumption is 0.2% (200kg/ mu) of top layer 20cm soil qualities.
Influence of the soil passivator of table 5 to rice yield, brown rice, leaf, stem and root cadmium content
The soil pH of table 6, available Cd, water extraction phosphorus and rapid available phosphorus change
The soil Cd of table 7 chemical speciation
As a result show：
Single lime (S) processing, rice yield improve 13kg/ mus compared with control, at comparative example DS1, DS3, DS4, DS8
Reason makes rice yield add 54,41,32 and 50kg/ mus compared with CK respectively, and passivator 1# and 3# is 72 and 61 compared with CK output increaseds
Kg/ mus (table 4).Compared to S and CK processing, it is more conducive to containing the processing of the composite passivant of potassium dihydrogen phosphate and hydroxyapatite
Reduce the content that cadmium is enriched with Brown Rice, leaf, stem and root, especially passivator 1# and 3# processing range of decrease highests, cadmium in brown rice
Content be reduced to 0.17 and 0.19mg/kg, meet in food《Pollutants in food is limited the quantity》(GB2762-2012) limitation of cadmium
0.2mg/kg.But other processing fail to make brown rice cadmium content be reduced to below 0.2mg/kg.
Table 6 shows that single lime treatment makes soil pH improve 0.27 unit, contains hydroxyapatite and bloodstone
Composite passivant 1# and 3# processing soil pH improve effect it is best, respectively reach 0.68 and 0.65 unit, and CaCl2Extraction
State cadmium content reduces by 50% or so respectively compared with CK.In addition, the addition of passivator adds containing for soil water extraction phosphorus and rapid available phosphorus
Amount, especially DS4 and DS8 processing are with higher phosphorus release risk, and passivator 1# and 3# processing phosphorus release risk are smaller.
As shown in table 7, compared with the control, passivator processing significantly reduces soil ion exchange state Cd contents, and blunt
Agent 1# and 3# handle range of decrease highest；Meanwhile passivator processing adds soil carbonate reference state, iron and manganese oxides combine
State, organically combine state and residual form Cd contents.It can be seen that the addition of passivator can promote cadmium from using state to potential available
State does not convert using state, serves heavy metal-passivated Cd effect, reduces heavy metal activity, and then promote the life of plant
It is long.
It should be understood that example as described herein and embodiment are not intended to limit the invention, this area only for explanation
Technical staff can make various modifications or change according to it, within the spirit and principles of the invention, any modification for being made,
Equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. acid soil cadmium passivator, it is characterised in that：Composition includes rice hull carbon, lime, hydroxyapatite, bloodstone.
- 2. acid soil cadmium passivator as claimed in claim 1, it is characterised in that：It is rice hull carbon and lime, hydroxyapatite, red The weight ratio of iron ore is 35:35:20:10.
- 3. acid soil cadmium passivator as claimed in claim 1, it is characterised in that：Composition also includes active silica flour and humic Soil.
- 4. acid soil cadmium passivator as claimed in claim 3, it is characterised in that：It is rice hull carbon and lime, hydroxyapatite, red Iron ore, active silica flour, weight humous ratio are 25~35:25~35:18~22:6~10:5~9:4~6.
- 5. the acid soil cadmium passivator as described in claim 3 or 4, it is characterised in that：The active silica flour is by the following method It is prepared：Calcium hydroxide, silica and water are mixed, the precipitation except supernatant, obtained is filtered off after hydro-thermal reaction and is passed through It is the active silica flour after calcination processing.
- 6. the acid soil cadmium passivator as described in claim 3 or 4, it is characterised in that：The fertile soil is made by the following method It is standby to form：Pollution-free soil is gathered, pollution-free soil is mixed with muck, agricultural crop straw, urea is then added, adds EM Bacterium dilution, the fertile soil is obtained after fermentation process.
- 7. the preparation method of the acid soil cadmium passivator as any one of claim 1 to 6, it is characterised in that：Including Following steps：Pulverization process is carried out respectively to each composition, is then homogenously mixed together, obtains the acid soil cadmium passivation Agent.
- A kind of 8. acidic cadmium polluted soil restorative procedure, it is characterised in that：Comprise the following steps：Will be any in claim 1 to 6 Acid soil cadmium passivator described in is well mixed with contaminated soil, and acid soil cadmium passivator dosage is contaminated soil weight 0.2%~0.4%, afterwards according to contaminated soil maximum water-holding capacity 70% plus water, finally balance more than five days.
- A kind of 9. acidic cadmium polluted arable land restorative procedure, it is characterised in that：Comprise the following steps：Smooth arable land, in 20cm topsoils Soil applies the acid soil cadmium passivator any one of claim 1 to 6, turns over processing afterwards.
- 10. acid arable land cadmium restorative procedure as described in claim 9, it is characterised in that：Acid soil cadmium passivator is applied Dosage is 450~600kg/667m2。
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| CN108329919A (en) * | 2017-12-21 | 2018-07-27 | 南京信息工程大学 | A kind of conditioner and its preparation and application for cadmium pollution conditioner for acidified soil |
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| CN109294588A (en) * | 2018-08-30 | 2019-02-01 | 安徽农业大学 | A kind of passivator and its application method for repairing heavy metals in farmland cadmium pollution |
| CN110016345A (en) * | 2019-04-24 | 2019-07-16 | 广西博世科环保科技股份有限公司 | A kind of steady arsenic soil passivator of drop cadmium and its application method |
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| CN110028974A (en) * | 2019-05-09 | 2019-07-19 | 湖南联和环保科技有限公司 | A kind of heavy metal cadmium soil remediation passivator, preparation method and applications |
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| CN111234828A (en) * | 2020-02-03 | 2020-06-05 | 南阳师范学院 | Passivating agent, preparation method and method for inhibiting cadmium absorption of overground part of crop |
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| CN113416012A (en) * | 2021-07-05 | 2021-09-21 | 常熟理工学院 | Method for preparing curing agent by using concrete waste residues |
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