CN104646405A - Electrode device and method for lowering arsenic and lead concentrations in rice - Google Patents
Electrode device and method for lowering arsenic and lead concentrations in rice Download PDFInfo
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- CN104646405A CN104646405A CN201510082176.0A CN201510082176A CN104646405A CN 104646405 A CN104646405 A CN 104646405A CN 201510082176 A CN201510082176 A CN 201510082176A CN 104646405 A CN104646405 A CN 104646405A
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Abstract
The invention discloses an electrode device for lowering arsenic and lead concentrations in rice. The electrode device comprises an anode and a cathode, wherein an anode electrode is connected with a cathode electrode by a lead which is connected with a resistor in series; and the anode and the cathode are made of inert conductive materials. The invention further discloses a method for lowering arsenic and lead concentrations in rice by employing the electrode device. The accumulation of arsenic and lead in tissues of the rice can be significantly lowered; and transfer of lead and arsenic in paddy soil towards a plant body is effectively controlled.
Description
Technical field
The present invention relates to a kind of electrode assembly for reducing arsenic lead concentration in paddy rice.
The invention still further relates to the method utilizing above-mentioned electrode assembly to reduce arsenic lead concentration in paddy rice.
Background technology
Heavy metal problem in agricultural soil, serious threat is to the food security of China.Paddy rice, because its distinctive growing environment and self-characteristic, becomes a kind of crop of easy enriching heavy metal arsenic.2010 one show there is the arsenic content of 47 higher than national standard (thunderous etc., 2009) in 112 selective examination samples for the selective examination of market, Hunan rice.Simple and effective method controls the arsenic content in paddy rice, is to ensure that China take rice as an urgent demand of the population health of staple food.
Arsenic pollution control in agricultural soil, roughly can be divided into three types:
One, for the improvement of soil.The improvement of soil can be divided into Physical, chemical method and bioanalysis.Physical is by soil moved in improve the original, and vitrifying, the modes such as electric field driven, reach the object of to fix arsenic or removing.Physical is instant effect often, and cost is high, and be applied to the plot of high pollution in zonule that city causes because of industrial development, the Application comparison in agricultural soil is rare more.Chemistry is fixing, and elution technique counterpart logos cost is lower.Modified form soil-repairing agent based on iron and manganese oxides (is turned round and look at the gentle Zhang Mingkui of state by a large amount of for the effective arsenic in fixing agricultural soil and lead, 2008), and be used to promote that Arsenic in Soil shifts in solution with the anionic eluent that phosphate etc. is representative, and the arsenic removed by the mode of the extracting soil liquid in soil pore water, thus reach the object removing arsenic.Comparatively successfully bioanalysis is by arsenic super enriching plant to agrological reparation at present, and Typical Representative is ciliate desert-grass.Utilize ciliate desert-grass to have application to polluting the reparation of ploughing, but phytoremediation is for a long time consuming time, during repairing, arable land can not be cultivated, and is therefore difficult to wide the farm land being applied to arsenic and exceeding standard.
Two, for the optimization of rice varieties.Although the hereditary capacity of paddy rice and the special arsenic of cultivating environment and making in the easy Enriching soil of paddy rice, and arsenic in seed is caused to exceed standard.Numerous research shows, the genotypic difference of paddy rice significantly can affect the ability of its enriching heavy metal.The 239 increment product coming from national different regions are planted in areal by Jiang Bin etc., find that the existence of each kind lead, arsenic, cadmium content is extremely remarkable and obtain genotypic difference, and filtered out the kind of a series of low lead or low cadmium or low arsenic.The optimization method of rice varieties can avoid the process to soil, ensures that soil pollution is not while health risk, maintains the utilizability of cultivated soil.But, low arsenic kind may exist yield poorly, resistance is poor, promote not easily and cultivated the problems such as ambient influnence is large, it is actual that to promote case little.
Three, for the management of cropping pattern.Need a large amount of moisture in the planting process of paddy rice, significantly can be reduced the arsenic content in rice grain by effective water management.Gondola result of study finds, very large on the impact of arsenic content in rice grain with irrigation method, and research finds that sprinkling irrigation mode can make arsenic content in paddy compared with the continuous broad irrigation mode of tradition, reduce 98%.Water management may be the method for arsenic content in most promising reduction in future paddy rice.Mainly be limited at present the training that water management needs peasant; In addition, for the soil of arsenic cadmium combined pollution, minimizing Submergence time can reduce the arsenic in seed, but significantly improves the cadmium in seed.
Summary of the invention
The object of this invention is to provide a kind of electrode assembly for reducing arsenic lead concentration in paddy rice.
Another object of the present invention is to provide a kind of method utilizing above-mentioned electrode assembly to reduce arsenic lead concentration in paddy rice.
For achieving the above object, provided by the inventionly comprise anode and negative electrode for reducing the electrode assembly of arsenic lead concentration in paddy rice, connected by wired in series one resistance between anode and cathode electrode; Its Anodic and negative electrode are inactive, conductive material.
Described electrode assembly, wherein, inactive, conductive material is graphite carbon felt, granular graphite, carbon cloth or charcoal.
Described electrode assembly, wherein, the wire of jointed anode and negative electrode is stainless steel, the copper aluminum steel of titanium silk or parcel impermeable material.
Described electrode assembly, wherein, connect between anode and negative electrode the resistance of resistance between 5 ohm to 5000 ohm.
The method utilizing above-mentioned electrode assembly to reduce arsenic lead concentration in paddy rice provided by the invention:
Negative electrode is arranged in the higher water layer of rice field oxygen concentration, contacts with oxygen, for anode provides electron acceptor, under anode is positioned at the native water termination in rice field, plays the effect regulating redox of soil ability.
Described method, wherein, anode to be positioned under the native water termination in rice field 5 to 30cm place.
The present invention can significantly reduce paddy rice respectively organize in the accumulation of arsenic lead, effectively control lead in paddy soils and arsenic to the transfer in plant.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention for reducing the electrode assembly of arsenic lead concentration in paddy rice.
Symbol description in accompanying drawing
1 anode, 2 negative electrodes, 3 wires, 4 resistance.
Detailed description of the invention
The essence of water management reduction arsenic is to the redox adjustment of paddy soil, based on the long-term research to rice field problem, the present invention utilizes easy electrode system to replace complicated water management system, reach the object reducing reduction of ferrous oxide, and then reduce the activation of Arsenic in Soil, the final arsenic content reduced in rice tissue.
Waterflooding drainage procedure is repeatedly needed in the planting process of paddy rice.Under non-flooding condition, arsenic is plumbous most to be adsorbed by the iron and manganese oxides in soil, and biological utilizability is very low, to be not easy absorb by root system of plant; Under flooding condition, iron and manganese oxides is by micro-reduction, the ionic condition of solubilised state is changed into from water-fast solid state, after iron and manganese oxides is dissolved, be adsorbed on the arsenic lead that oxide shows also to be released in the middle of the soil liquid, the arsenic lead in the soil liquid has very high bioavailability simultaneously.Therefore, by controlling the redox change in soil, the rate of reduction of iron and manganese oxides in paddy soil can be affected, thus reduce the stripping of the arsenic lead of soil solid absorption.
The present invention utilizes natural redox system in paddy soil, by anode and cathode electrode be built into as shown in Figure 1 be applied to rice field repair electrode assembly.
Electrode assembly of the present invention is made up of anode 1 and negative electrode 2, is connected between anode 1 and negative electrode 2 by wire 4 resistance 4 of connecting.The material of anode and negative electrode can be the inactive, conductive material such as graphite carbon felt, granular graphite, carbon cloth, charcoal.
When installing electrode assembly of the present invention, negative electrode being arranged in the water layer that rice field oxygen concentration is higher, contacting with oxygen, for anode provides electron acceptor; Anode is positioned at about 5 to 30 centimeters under the native water termination in rice field, plays the effect regulating redox of soil ability.The wire of connecting electrode can be stainless steel, the copper aluminum steel of titanium silk or parcel impermeable material.The resistance connecting the resistance of two electrodes is determined according to the internal resistance of electrode assembly, generally between 5 ohm to 5000 ohm.
In the rice field not adding electrode, under flooding condition, anaerobe utilizes the organic matter in soil to be electron donor, fast restore iron and manganese oxides, thus discharges arsenic lead; In the paddy soil adding electrode, anode electrode replaces iron and manganese oxides, becomes the electron acceptor of anaerobe, thus decreases the release of arsenic lead.
Of the present inventionly to be characterized as:
A, utilize electrode system to the regulation and control of the redox of soil, reduce the arsenic lead content in paddy soils pore water and paddy rice;
Position 5 to 30 centimeters under paddy soils water termination of b, anode;
Between c, anode and cathode, resistive tissue is between 5 ohm to 5000 ohm.
Embodiment:
Paddy soil is that rice varieties is Xiushui 128 Zi adding the Jiaxing Paddy Soil of arsenic to 120ppm.Be placed on diameter 9cm in soil, in the plastic tank of dark 15cm, waterflooding moved into rice seedlings after 11 days, grew and sampled after 7 days, analyzed wherein heavy metal arsenic, copper, cadmium, lead concentration in root and blade.
Anode electrode area is divided into three gradients: 15,21 and 27cm
2.Thickness of electrode is: 0.5cm, and electrode buried depth is 6cm: outer meeting resistance is 500 ohm.Each gradient three repetition.
With or without in electrode system, paddy rice in-vivo heavy metal content is as shown in the table:
This result shows, after adding electrode, the arsenic in rice root drops to 3820mg/kg from 4544mg/kg, and in Rice Leaf, arsenic drops to 112mg/kg from 271mg/kg; Lead 30.2mg/kg from root, drop to 8.4mg/kg, 4.6mg/kg in leaf, drops to 0.25mg/kg.This result shows that the present invention can control lead in paddy soils and arsenic effectively to the transfer in plant.
Claims (6)
1. for reducing an electrode assembly for arsenic lead concentration in paddy rice, comprise anode and negative electrode, connected by wired in series one resistance between anode and cathode electrode;
Wherein, anode and negative electrode are inactive, conductive material.
2. electrode assembly according to claim 1, wherein, inactive, conductive material is graphite carbon felt, granular graphite, carbon cloth or charcoal.
3. electrode assembly according to claim 1, wherein, the wire of jointed anode and negative electrode is stainless steel, the copper aluminum steel of titanium silk or parcel impermeable material.
4. electrode assembly according to claim 1, wherein, connect between anode and negative electrode the resistance of resistance between 5 ohm to 5000 ohm.
5. utilize electrode assembly described in claim 1 to reduce the method for arsenic lead concentration in paddy rice:
Negative electrode is arranged in the higher water layer of rice field oxygen concentration, contacts with oxygen, for anode provides electron acceptor, under anode is positioned at the native water termination in rice field, plays the effect regulating redox of soil ability.
6. method according to claim 5, wherein, anode to be positioned under the native water termination in rice field 5 to 30cm place.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510082176.0A CN104646405A (en) | 2015-02-15 | 2015-02-15 | Electrode device and method for lowering arsenic and lead concentrations in rice |
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| CN201510082176.0A CN104646405A (en) | 2015-02-15 | 2015-02-15 | Electrode device and method for lowering arsenic and lead concentrations in rice |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259234A (en) * | 2015-11-06 | 2016-01-20 | 江西农业大学 | Preparation method for sensitive electrode based on pond pine charcoal |
| CN105521991A (en) * | 2015-12-04 | 2016-04-27 | 河海大学 | Combined remediation method for cadmium-polluted paddy field soil by drying and wetting control in combination with electrodynamic force and hyperaccumulators |
| CN108607878A (en) * | 2018-04-28 | 2018-10-02 | 厦门理工学院 | A kind of microorganism electrochemical method repairs the device and method of contaminated sites object |
| CN109772876A (en) * | 2019-03-25 | 2019-05-21 | 北京大学深圳研究生院 | A kind of method that electric power coupling pepper planting repairs arsenic pollution farming land soil |
| CN110695079A (en) * | 2019-10-23 | 2020-01-17 | 常熟理工学院 | Method for removing mercury in soil polluted by bottom mercury by using electric restoration coupled plant extraction technology |
| CN112514768A (en) * | 2020-11-16 | 2021-03-19 | 湖北三峡职业技术学院 | Method for reducing rice to absorb heavy metal in soil by soil microbial fuel cell |
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| CN1508074A (en) * | 2002-12-13 | 2004-06-30 | 中国科学院生态环境研究中心 | Method and apparatus for treating water by catalytic reduction of nano metal-memebrane composite electrode |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105259234A (en) * | 2015-11-06 | 2016-01-20 | 江西农业大学 | Preparation method for sensitive electrode based on pond pine charcoal |
| CN105521991A (en) * | 2015-12-04 | 2016-04-27 | 河海大学 | Combined remediation method for cadmium-polluted paddy field soil by drying and wetting control in combination with electrodynamic force and hyperaccumulators |
| CN105521991B (en) * | 2015-12-04 | 2018-04-20 | 河海大学 | A kind of dry and wet regulation and control are with reference to electric power and the cadmium pollution paddy soil combined remediation method of enriching plant |
| CN108607878A (en) * | 2018-04-28 | 2018-10-02 | 厦门理工学院 | A kind of microorganism electrochemical method repairs the device and method of contaminated sites object |
| CN109772876A (en) * | 2019-03-25 | 2019-05-21 | 北京大学深圳研究生院 | A kind of method that electric power coupling pepper planting repairs arsenic pollution farming land soil |
| CN110695079A (en) * | 2019-10-23 | 2020-01-17 | 常熟理工学院 | Method for removing mercury in soil polluted by bottom mercury by using electric restoration coupled plant extraction technology |
| CN110695079B (en) * | 2019-10-23 | 2021-06-25 | 常熟理工学院 | Method for removing mercury in soil polluted by bottom mercury by using electric restoration coupled plant extraction technology |
| CN112514768A (en) * | 2020-11-16 | 2021-03-19 | 湖北三峡职业技术学院 | Method for reducing rice to absorb heavy metal in soil by soil microbial fuel cell |
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Application publication date: 20150527 |