CN109187706A - A method of refining gutter oil is detected using polyaniline chip - Google Patents
A method of refining gutter oil is detected using polyaniline chip Download PDFInfo
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- CN109187706A CN109187706A CN201810829535.8A CN201810829535A CN109187706A CN 109187706 A CN109187706 A CN 109187706A CN 201810829535 A CN201810829535 A CN 201810829535A CN 109187706 A CN109187706 A CN 109187706A
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- polyaniline
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- gutter oil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/48—Systems using polarography, i.e. measuring changes in current under a slowly-varying voltage
Abstract
The invention discloses a kind of method for detecting refining gutter oil using polyaniline chip, the method obtains electric current-concentration standard curve in the conductivity of several Sodium ion concentration gradients by measurement polyaniline chip, detects gutter oil further according to the standard curve.The present invention selects polyaniline chip, sodium ion is entrained in original nonconducting polyaniline chip, by the conductivity for repeatedly measuring the polyaniline chip under different Na ion concentrations, one can be made under certain voltage, electric current-concentration curve of different Na ion concentrations, different degrees of gutter oil and edible oil can be distinguished using this curve, realize the purpose for detecting gutter oil rapidly and efficiently and extensively.
Description
Technical field
The present invention relates to gutter oil detection technique fields more particularly to a kind of detected using polyaniline chip to refine trench
The method of oil.
Background technique
With the development of the times, scientific and technological, people increasingly pay attention to taste of diet and health.But people
In edible food, it is difficult to judge the difference of normal oil and edible oil, it is even to this day, precisely and public there are no releasing one
The identification recognized identifies the method for gutter oil, and gutter oil is caused to have great harm to the health of people.
Gutter oil is mostly that the edible oil after use extracts refinement, wherein necessarily using edible salt, and is eaten
Essential there are sodium ion in salt, this sodium ion adjoint always will not can be removed in gutter oil；On the other hand,
Gutter oil a large amount of substances as present in it and it is aobvious apparent acid, use carbonic acid to remove the acidity in gutter oil
Sodium or ammonium hydrogen carbonate etc., and among these there is also a large amount of sodium ion.Used food is not eaten in the presence of these sodium ions usually
Be not in that release is such a in oil to identify based on the conductivity having in detection gutter oil by sodium ion
Gutter oil.
Polyaniline is a kind of high molecular synthetic material, is commonly called as conductive plastics.It is a kind of special type function material, has modeling
The density of material, and the machinability of the electric conductivity with metal and plastics, are also equipped with the chemistry and electricity that metal and plastics are short of
Chemical property, can be used as stealth material, anti-corrosion material in national defense industry, it is civilian on can be used as anti-corrosion of metal corrosion material, resist it is quiet
Electric material, electronic chemical product etc..
At present both at home and abroad for gutter oil can not develop it is a kind of rationally, effectively and rapidly method detection method is main
Reason is not determining a clearly convictive gutter oil marker to identify gutter oil.The present invention is directed to trench
Sodium ion in oil usually implements identification for gutter oil to do underlying member, selects polyaniline chip, sodium ion is adulterated
In original nonconducting polyaniline chip, using electrochemical workstation, its electric conductivity is detected.With such as the method, by multiple
The conductivity for measuring the polyaniline chip under different Na ion concentrations can make one under certain voltage, different sodium ions
Electric current-concentration curve of concentration can distinguish different degrees of gutter oil and edible oil using this curve.
Summary of the invention
Technical problems based on background technology are detected refinedly the invention proposes a kind of using polyaniline chip
The method of ditch oil selects polyaniline chip, sodium ion is entrained in original nonconducting polyaniline chip, by repeatedly surveying
The conductivity of polyaniline chip under fixed different Na ion concentrations, can make one under certain voltage, different sodium ions are dense
Electric current-concentration curve of degree can distinguish different degrees of gutter oil and edible oil using this curve, realize quick height
Effect and the extensively purpose of detection gutter oil.
A kind of method detecting refining gutter oil using polyaniline chip proposed by the present invention, the method pass through measurement
Polyaniline chip obtains electric current-concentration standard curve in the conductivity of several Sodium ion concentration gradients, further according to the standard
Curve detection gutter oil.
Preferably, the described method comprises the following steps:
(1) concentration-current standard curve production: first with three probe electrodes of electrochemical workstation, it is added in polyphenyl
On amine interdigital electrode chip, working electrode and reference electrode are made in side to electrode in the corresponding other side with soap solution
Solution to be measured；Reselection CV-Cyclic Voltammetry sweeps different soap solution concentration using cyclic voltammetry
Test is retouched, data is arranged and obtains the concentration-current standard curve；
(2) gutter oil is tested: taking 100ml deionized water first, 1-5mg aniline and 1~2 drop gutter oil are added thereto
Sample is thoroughly mixed；Take the trench oil droplet mixed on polyaniline electrode chip, drying operates 2~3 times repeatedly；
Finally using the test of electrochemistry station under -0.15V voltage, corresponding current-vs-time map, according to above-mentioned concentration-current standard
Curve carries out analysis of experimental results.
Preferably, it is -0.8V~0.8V that voltage range, which is arranged, in cyclic voltammetry in step (1), sweep speed is
0.05V/s。
Preferably, the preparation process of the polyaniline chip the following steps are included:
S1,0.0010g soap solid is weighed using electronic balance, be dissolved in 100ml deionized water, stirred with glass bar
To being completely dissolved, it is denoted as solution A；
S2,10ml soap solution is taken in solution A with 10ml graduated cylinder, be added in 90ml deionized water, it is slight with glass bar
Stirring, is denoted as solution B；
S3,10ml soap solution is taken in solution B with 10ml graduated cylinder, be added in 90ml deionized water, it is slight with glass bar
Stirring, is denoted as solution C；
S4, and so on, difference obtained solution D, solution E, solution F, solution G, Solution H, solution I, solution J；
S5,5ml solution is taken from solution A~J respectively, 1-5mg polyaniline powder is added, after concussion stirs evenly, ultrasound 10~
15 minutes, obtained solution be denoted as respectively solution a, solution b, solution c, solution d, solution e, solution f, solution g, solution h,
Solutions i, solution j；
S6, solution a~j is dripped respectively in making solution be paved with interdigital electrode in interdigital electrode, is put into 3~5 points of oven drying
Clock corresponds dropwise addition solution a~j after taking out the interdigital electrode of drying again, is put into oven drying 3~5 minutes, so anti-
It is 2~3 times multiple, the polyaniline interdigital electrode chip of various concentration sodium ion doping is prepared.
Preferably, the preparation method of the polyaniline is the following steps are included: deionized water is added in A, weighing aniline monomer
Beaker in, with glass bar stir to solution clarify, obtain concentration be 16~17g/L aniline solution；It is molten to weigh ammonium persulfate
In the beaker of deionized water, with glass bar gentle agitation, the ammonium persulfate solution that concentration is 4.1~4.2 g/L is obtained；B, will
Isometric ammonium persulfate solution is added drop-wise in aniline solution, is stirred to react 5-6 hours；C, by above-mentioned reaction product ethyl alcohol and
Deionized water washing, and it is dried to obtain the polyaniline.
The present invention has made polyaniline chip a~j to solution a~j respectively, and on the other side mixed in polyaniline respectively
Miscellaneous 10-3g/100ml、10-4g/100ml、10-5g/100ml、10-6g/100ml、10-7g/100ml、 10-8g/100ml、10- 9g/100ml、10-10g/100ml、10-11G/100ml and 10-12Soap solution under g/100ml concentration, just forms one in this way
The Na ion concentration of a steady decrease, the doping under different ions concentration, has the polyaniline conductivity after doping different
It influences, will occur different C-V curves in this way, finally oppose to the polyaniline C-V curve under the doping of each concentration sodium ion
Than, synthesis and analysis.Technical solution of the present invention can be realized and effectively and rapidly detect gutter oil and its content, and method letter
Singly it is easily achieved.
Detailed description of the invention
Fig. 1 is the present invention polyaniline chip i-c that under -0.15V voltage prepared by various concentration soap solution figure.
Fig. 2 is one i-t curve of trench oil samples of the present invention.
Fig. 3 is two i-t curve of trench oil samples of the present invention.
Specific embodiment
In the following, technical solution of the present invention is described in detail by specific embodiment.Embodiment agents useful for same is
Routine test or commercially available acquisition.
Embodiment 1:
A method of refining gutter oil is detected using polyaniline chip, comprising the following steps:
1.1 prepare anacidity polyaniline
(1) a 100ml beaker is taken, fills 30ml deionized water with the addition of electronic balance weighing 0.5000g aniline monomer
Beaker in, with glass bar stir to solution clarify；
(2) 100ml beaker separately is taken, is dissolved in electronic balance weighing 1.2500g ammonium persulfate and fills 30ml deionized water
In beaker, with glass bar gentle agitation；
Aniline solution is stirred using electric mixer, it is slow that blend compounds head dropper draws configured ammonium persulfate solution
It is added dropwise in aniline solution (using ice bag control temperature in zero degrees celsius or so),
(3) after being added dropwise to complete, to solution reaction 5-6 hours；
(4) it is filtered, is intersected repeatedly for three times with the polyaniline solutions that ethyl alcohol and deionized water complete reaction；
(5) polyaniline solutions completed will be filtered to dry；After the completion of drying, polyaniline nano-rod is obtained.
The production of 1.2 polyaniline chips
(1) 0.0010g soap solid is weighed using electronic balance, is dissolved in 100ml deionized water, is stirred with glass bar
To being completely dissolved, it is denoted as solution A；
(2) 10ml soap solution is taken in solution A with 10ml graduated cylinder, be added in 90ml deionized water, it is slight with glass bar
Stirring, is denoted as solution B；
(3) 10ml soap solution is taken in solution B with 10ml graduated cylinder, be added in 90ml deionized water, it is slight with glass bar
Stirring, is denoted as solution C；
(4) upper two step by step rapid, difference obtained solution D, solution E, solution F, solution G, Solution H, solution I, solution J are repeated；
(5) 5ml solution is taken from solution A~J respectively, 2mg polyaniline powder is added, after concussion stirs evenly, ultrasound 10~15
Minute, obtained solution is denoted as solution a, solution b, solution c, solution d, solution e, solution f, solution g, solution h, molten respectively
Liquid i, solution j
(6) using dropper is taken out from solution a micro solution drop in interdigital electrode, be put into baking oven drying 3-5 minutes.
Baking oven is put into 3-5 minutes after dripping solution a after taking-up again, 2~3 times repeatedly；
(7) repetition the 6th is step by step rapid, until 15~20 same polyaniline chips are made；
(8) it is step by step rapid to repeat the 6th step the 7th, it is stand-by to make same polyaniline chip using solution b~j.It is manufactured
Polyaniline interdigital electrode chip is denoted as chip a~j respectively；
(9) laboratory apparatus is arranged, after polyaniline chip mark arranges well, to use in next step.
The production of 1.3 concentration-current standard curve
(1) three probe electrodes for utilizing electrochemical workstation, are added on the polyaniline interdigital electrode chip prepared, work
Make electrode and reference electrode in side, to electrode in the other side；
(2) CV-Cyclic Voltammetry is selected, using cyclic voltammetric, voltage range is set in -0.8V~0.8V,
Scanning circle number is a circle, and sweep speed 0.05V/s is scanned；
(3) it repeats the above steps, test is scanned to the polyaniline chip prepared before；
(4) instrument is arranged, induction-arrangement simultaneously analyzes data；
(5) it is mapped using OriginPro, synthesizes the current curve under different soap solution concentration.
The test of 1.4 gutter oils
(1) 100ml deionized water is taken, the synthetic polyaniline nano-rod of 4mg and 1~2 drop gutter oil one are added thereto
Number sample, is thoroughly mixed；
(2) it takes the trench oil droplet mixed on electrode slice, dries 3~5min, operate 2~3 times repeatedly；
(3) using the test of electrochemistry station under -0.15V voltage, the i-t image of manufactured gutter oil chip；
(4) above-mentioned three are repeated step by step suddenly to No. two samples of gutter oil, data image arranges stand-by.
According to the above test result, for more efficient more accurate test gutter oil, it is horizontal seat that the present embodiment, which takes concentration,
It marks, the current value under -0.15V is ordinate, and a current curve corresponding to the various concentration under -0.15V voltage is made
(working curve), as shown in Figure 1, at constant voltage -0.15V, with the raising of soap solution concentration, corresponding to electricity
Flow valuve also increases, 10-5G/100ml~10-3During g/100ml, curve has approach smooth trend, 10-12g/
100ml~10-11Under g/100ml process, there is also nearly smooth trends, because when soap solution is 0, corresponding electric current
Value is 0, so tending towards stability is reasonable phenomenon, and the curve upper right corner is tended towards stability likely the reason is that concentration increases to one
When definite value, sodium ion doping level discrimination is little, and electric conductivity difference degree is caused not have centre to tend to be obvious.
In order to verify the feasibility of this experimental result, gutter oil No.1 sample and No. two samples are acquired from school lunch service,
It takes identical experimental procedure to carry out test operation instead of soap solution, finally adds constant -0.15V voltage to chip, see
Examine its size of current, as shown in Figures 2 and 3, when given voltage is -0.15V, No.1 sample show one it is stable
This value is compared, Na ion concentration corresponding to sample one and sample two by current value with working curve i-c figure before
About the concentration of soap solution is 10-11G/100ml~10-12Na ion concentration under g/100ml.Under this curve, Wo Menzhi
Road is basic feasible solution using the method measurement gutter oil.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited to
This, anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention
And its inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of method for detecting refining gutter oil using polyaniline chip, which is characterized in that the method passes through measurement polyphenyl
Amine chip obtains electric current-concentration standard curve in the conductivity of several Sodium ion concentration gradients, further according to the standard curve
Detect gutter oil.
2. the method according to claim 1 for detecting refining gutter oil using polyaniline chip, which is characterized in that the side
Method the following steps are included:
(1) concentration-current standard curve production: first with three probe electrodes of electrochemical workstation, it is added in polyaniline fork
Refer on electrode chip, working electrode and reference electrode are made to be measured molten in side to electrode in the corresponding other side with soap solution
Liquid；Reselection CV-Cyclic Voltammetry is scanned test to different soap solution concentration using cyclic voltammetry,
It arranges data and obtains the concentration-current standard curve；
(2) gutter oil is tested: taking 100ml deionized water first, 1-5mg polyaniline and 1~2 drop trench oil sample are added thereto
Product are thoroughly mixed；Take the trench oil droplet mixed on polyaniline electrode chip, drying operates 2~3 times repeatedly；Finally
Using the test of electrochemistry station under -0.15V voltage, corresponding current-vs-time map, according to above-mentioned concentration-current standard curve
Carry out analysis of experimental results.
3. the method according to claim 2 for detecting refining gutter oil using polyaniline chip, which is characterized in that step
(1) in, it is -0.8V~0.8V, sweep speed 0.05V/s that voltage range, which is arranged, in cyclic voltammetry.
4. the method according to claim 1,2 or 3 for detecting refining gutter oil using polyaniline chip, which is characterized in that
The preparation process of the polyaniline chip the following steps are included:
S1,0.0010g soap solid is weighed using electronic balance, be dissolved in 100ml deionized water, stirred with glass bar to complete
Dissolution, is denoted as solution A；
S2, it takes 10ml soap solution in solution A with 10ml graduated cylinder, is added in 90ml deionized water, with glass bar gentle agitation,
It is denoted as solution B；
S3, it takes 10ml soap solution in solution B with 10ml graduated cylinder, is added in 90ml deionized water, with glass bar gentle agitation,
It is denoted as solution C；
S4, and so on, difference obtained solution D, solution E, solution F, solution G, Solution H, solution I, solution J；
S5,5ml solution is taken from solution A~J respectively, 1-5mg aniline powder is added, after concussion stirs evenly, ultrasound 10~15 minutes,
Obtained solution is denoted as solution a, solution b, solution c, solution d, solution e, solution f, solution g, solution h, solutions i, molten respectively
Liquid j；
S6, solution a~j is dripped respectively in making solution be paved with interdigital electrode in interdigital electrode, is put into oven drying 3~5 minutes, takes
It is corresponded again after the interdigital electrode dried out and solution a~j is added dropwise, be put into oven drying 3~5 minutes, repeatedly 2~3
It is secondary, the polyaniline interdigital electrode chip of various concentration sodium ion doping is prepared.
5. the method according to claim 4 for detecting refining gutter oil using polyaniline chip, which is characterized in that described poly-
The preparation method of aniline the following steps are included: A, weigh aniline monomer and be added in the beaker of deionized water, with glass bar stir to
Solution clarification obtains the aniline solution that concentration is 16~17g/L；It weighs ammonium persulfate to be dissolved in the beaker of deionized water, uses glass
Glass stick gentle agitation obtains the ammonium persulfate solution that concentration is 4.1~4.2g/L；B, isometric ammonium persulfate solution is added drop-wise to
In aniline solution, it is stirred to react 5-6 hours；C, above-mentioned reaction product ethyl alcohol and deionized water are washed, and is dried to obtain institute
State polyaniline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810829535.8A CN109187706B (en) | 2018-07-25 | 2018-07-25 | Method for detecting refined illegal cooking oil by using polyaniline chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810829535.8A CN109187706B (en) | 2018-07-25 | 2018-07-25 | Method for detecting refined illegal cooking oil by using polyaniline chip |
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| CN109187706A true CN109187706A (en) | 2019-01-11 |
| CN109187706B CN109187706B (en) | 2021-01-15 |
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Citations (5)
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| CN101387612A (en) * | 2008-07-23 | 2009-03-18 | 昆明理工大学 | Method for detecting waste oil in qualified edible oil |
| CN201281697Y (en) * | 2008-09-02 | 2009-07-29 | 昆明理工大学 | Rapid detector for identifying whether edible oil being doped with trench oil or not |
| CN102721723A (en) * | 2012-07-04 | 2012-10-10 | 中南林业科技大学 | Hogwash oil identifying method based on volatile matter |
| CN203981624U (en) * | 2014-07-22 | 2014-12-03 | 遵义师范学院 | A kind of waste oil LED detects meter |
| CN104849251A (en) * | 2015-05-06 | 2015-08-19 | 广州市疾病预防控制中心 | Time resolution fluorescence immunoassay method and kit for fast detecting gutter oil |
-
2018
- 2018-07-25 CN CN201810829535.8A patent/CN109187706B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387612A (en) * | 2008-07-23 | 2009-03-18 | 昆明理工大学 | Method for detecting waste oil in qualified edible oil |
| CN201281697Y (en) * | 2008-09-02 | 2009-07-29 | 昆明理工大学 | Rapid detector for identifying whether edible oil being doped with trench oil or not |
| CN102721723A (en) * | 2012-07-04 | 2012-10-10 | 中南林业科技大学 | Hogwash oil identifying method based on volatile matter |
| CN203981624U (en) * | 2014-07-22 | 2014-12-03 | 遵义师范学院 | A kind of waste oil LED detects meter |
| CN104849251A (en) * | 2015-05-06 | 2015-08-19 | 广州市疾病预防控制中心 | Time resolution fluorescence immunoassay method and kit for fast detecting gutter oil |
Non-Patent Citations (3)
| Title |
|---|
| WEIGUO LIU 等: "Tracing the Source of Cooking Oils with an Integrated Approach of Using Stable Carbon Isotope and Fatty Acid Abundance", 《JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY》 * |
| 刘薇 等: "电导率法快速鉴别潲水油", 《城市环境与城市生态》 * |
| 黄芳 等: "电导率法快速鉴别地沟油的方法研究", 《粮油食品科技》 * |
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