CN111239232A - Method for detecting multiple heavy metals in children toys, pigments and coatings - Google Patents
Method for detecting multiple heavy metals in children toys, pigments and coatings Download PDFInfo
- Publication number
- CN111239232A CN111239232A CN202010070412.8A CN202010070412A CN111239232A CN 111239232 A CN111239232 A CN 111239232A CN 202010070412 A CN202010070412 A CN 202010070412A CN 111239232 A CN111239232 A CN 111239232A
- Authority
- CN
- China
- Prior art keywords
- detected
- solution
- sample
- plastic
- heavy metals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000576 coating method Methods 0.000 title claims abstract description 25
- 239000000049 pigment Substances 0.000 title description 13
- 239000004033 plastic Substances 0.000 claims abstract description 44
- 229920003023 plastic Polymers 0.000 claims abstract description 44
- 239000003960 organic solvent Substances 0.000 claims abstract description 27
- 238000004451 qualitative analysis Methods 0.000 claims abstract description 19
- 238000004445 quantitative analysis Methods 0.000 claims abstract description 19
- 239000000706 filtrate Substances 0.000 claims abstract description 12
- 238000003968 anodic stripping voltammetry Methods 0.000 claims abstract description 11
- 239000003973 paint Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000047 product Substances 0.000 claims abstract description 8
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000010355 oscillation Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 5
- 238000004832 voltammetry Methods 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 13
- 229910021645 metal ion Inorganic materials 0.000 claims description 11
- 150000002500 ions Chemical class 0.000 claims description 5
- 108091023037 Aptamer Proteins 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- 239000004793 Polystyrene Substances 0.000 description 5
- 239000005020 polyethylene terephthalate Substances 0.000 description 5
- 229920000139 polyethylene terephthalate Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
- 239000004800 polyvinyl chloride Substances 0.000 description 5
- 229920000915 polyvinyl chloride Polymers 0.000 description 5
- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- 235000019253 formic acid Nutrition 0.000 description 4
- RLSSMJSEOOYNOY-UHFFFAOYSA-N m-cresol Chemical compound CC1=CC=CC(O)=C1 RLSSMJSEOOYNOY-UHFFFAOYSA-N 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229910000497 Amalgam Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229960000583 acetic acid Drugs 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 239000012362 glacial acetic acid Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 229930003836 cresol Natural products 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 108091008104 nucleic acid aptamers Proteins 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4055—Concentrating samples by solubility techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4055—Concentrating samples by solubility techniques
- G01N2001/4061—Solvent extraction
Abstract
The invention discloses a method for detecting various heavy metals in toys for children, paint and coating. The method comprises the following steps: sampling the toy finished product to obtain a sample to be detected; selecting a corresponding organic solvent according to the material type of a sample to be detected, putting the sample to be detected into a sealable container filled with the organic solvent, and heating and vibrating the sample to be detected to obtain a plastic dissolving solution; adding dilute nitric acid into the plastic dissolving solution, placing the plastic dissolving solution in an ultrasonic oscillator for oscillation for a preset time, and then filtering the oscillated plastic dissolving solution to extract a filtrate containing heavy metals; and determining the filtrate as a solution to be detected, and performing qualitative and quantitative analysis on the heavy metal in the solution to be detected by using anodic stripping voltammetry. Under the method, the heavy metal content in toys for children, paint and coating can be effectively detected.
Description
Technical Field
The invention relates to the technical field of heavy metal detection, in particular to a method for detecting various heavy metals in toys for children, pigments and coatings.
Background
According to the statistics of the Chinese toy society, more than 70% of the toys produced in China all over the world are shown. Toy manufacturers in China generally adopt recycled plastics as raw materials of toys, the recycled plastics contain various toxic and harmful heavy metals, and most of children toys made of the recycled plastics exceed the standard. Therefore, many inferior toys are becoming invisible killers that affect the physical and mental health and life safety of children. For example, the surfaces of toys such as building blocks, children's vehicles, iron toys, etc. are coated with various paints or coatings, and the surface coatings may bring heavy metals into the body under the action of human body contact friction or a suitable solvent, that is, the heavy metals may migrate into the human body through a suitable medium. Then, when harmful metals such as lead, chromium, antimony, arsenic, barium, cadmium, mercury in these paints or coatings exceed standards, a threat to the health of children is created. Therefore, how to effectively detect the content of heavy metals in toys for children, pigments and coatings becomes a key factor for protecting the health of children.
Disclosure of Invention
The invention provides a method for detecting various heavy metals in children toys, pigments and coatings, and aims to solve the technical problem that the heavy metal content in the children toys, the pigments and the coatings cannot be effectively detected in the related technology.
The embodiment of the invention discloses a method for detecting multiple heavy metals in children toys, pigments and coatings in a first aspect, which comprises the following steps:
sampling the toy finished product to obtain a sample to be detected;
selecting a corresponding organic solvent according to the material type of the sample to be detected, putting the sample to be detected into a sealable container filled with the organic solvent, and heating and vibrating the sample to be detected to obtain a plastic dissolving solution;
adding dilute nitric acid into the plastic dissolving solution, placing the plastic dissolving solution in an ultrasonic oscillator for oscillation for a preset time, and then filtering the oscillated plastic dissolving solution to extract a filtrate containing heavy metals;
determining the filtrate as a solution to be detected, and carrying out qualitative and quantitative analysis on the heavy metal in the solution to be detected by using anodic stripping voltammetry.
As an alternative implementation manner, in the first aspect of the embodiments of the present invention, the performing qualitative and quantitative analysis on the heavy metal in the solution to be detected by using anodic stripping voltammetry includes:
electrolyzing the solution to be detected to ensure that metal ions in the solution to be detected are electrically reduced into atomic metal, so that a metal layer is enriched and formed on the surface of the working electrode;
re-oxidizing the metal layer to ions using a reverse voltage applied to the working electrode;
recording a voltammetry curve of the solution to be detected, and carrying out qualitative and quantitative analysis on the heavy metal in the solution to be detected according to the voltammetry curve.
As an alternative embodiment, in the first aspect of this embodiment of the invention, the working electrode is an immuno-electrode or a aptamer electrode.
As an alternative implementation manner, in the first aspect of the embodiments of the present invention, the performing qualitative and quantitative analysis on the heavy metal in the solution to be detected according to the voltammetry curve includes:
determining a peak potential value according to the position of a peak on the voltammetry curve to serve as a qualitative analysis basis of the heavy metal in the solution to be detected;
and determining the peak current of the voltammetry curve to be used as a quantitative analysis basis of the heavy metal in the solution to be detected.
As an alternative implementation manner, in the first aspect of the embodiment of the present invention, the peak current is proportional to the concentration of the metal ions in the solution to be detected.
As an alternative implementation, in the first aspect of this embodiment of the invention, the material type is PVC, PE, PA, PET, PU, PP or PS plastic.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the detection method of multiple heavy metals in the children toys, the pigments and the coatings comprises the following steps of sampling finished toy products to obtain samples to be detected; selecting a corresponding organic solvent according to the material type of a sample to be detected, putting the sample to be detected into a sealable container filled with the organic solvent, and heating and vibrating the sample to be detected to obtain a plastic dissolving solution; adding dilute nitric acid into the plastic dissolving solution, placing the plastic dissolving solution in an ultrasonic oscillator for oscillation for a preset time, and then filtering the oscillated plastic dissolving solution to extract a filtrate containing heavy metals; and determining the filtrate as a solution to be detected, and performing qualitative and quantitative analysis on the heavy metal in the solution to be detected by using anodic stripping voltammetry.
According to the method, the characteristic that the plastic has good solubility in the organic solvent can be utilized, the plastic is dissolved by using the appropriate organic solvent, heavy metal in the plastic is extracted to form the solution to be detected containing the organic solvent, qualitative and quantitative analysis is carried out on the heavy metal in the solution to be detected by using the anodic stripping voltammetry, the process operation is simple and convenient, and the problem of effectively detecting the content of the heavy metal in toys for children, pigments and coatings is solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flow diagram illustrating a method for detecting heavy metals in a child's toy, paint, or coating, according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating another method for detecting heavy metals in children's toys, paint, or coatings, according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
FIG. 1 is a flow chart illustrating a method for detecting heavy metals in a child's toy, paint, or coating, according to an exemplary embodiment. As shown in fig. 1, the method includes the following steps.
And 101, sampling the toy finished product to obtain a sample to be detected.
In the embodiment of the invention, the main raw material of the toy finished product is plastic, so the sample to be detected sampled from the toy finished product at least comprises plastic.
In the embodiment of the invention, optionally, after the finished toy product is sampled to obtain a sample to be detected, the sample to be detected can be washed and dried by using deionized water, so that the subsequent detection result of heavy metal is prevented from being polluted by other factors.
And 102, selecting a corresponding organic solvent according to the material type of the sample to be detected, putting the sample to be detected into a sealable container filled with the organic solvent, and heating and oscillating the sample to be detected to obtain a plastic dissolving solution.
As an alternative embodiment, the above material types may include, but are not limited to, PVC, PE, PA, PET, PU, PP or PS plastic.
In the embodiment of the present invention, the type of plastic may include PVC (polyvinyl chloride), PE (polyethylene), PA (polyamide), PET (polyethylene terephthalate), PU (polyurethane), PP (polypropylene), PS (polystyrene), or other polymer plastics, and the organic solvent for dissolving the plastic includes tetrahydrofuran, formic acid, glacial acetic acid, phenol/tetrachloroethane, m-cresol, benzene, toluene, ethanol, and the like. Plastics are various in kind (material type), and depending on the composition and structure, the organic solvent capable of dissolving is different. For example, PVC and PE plastic are soluble in tetrahydrofuran, PE is also soluble in formic acid, PA is soluble in formic acid, glacial acetic acid, phenol and cresol, PET is soluble in phenol/tetrachloroethane, m-cresol, PU is soluble in formic acid, PP, PS are soluble in aromatic hydrocarbon organic solvents such as benzene, and therefore, organic solvents can be selected to match the types of materials of the specimen to be detected.
In the embodiment of the invention, the dissolving speed of the sample to be detected in the organic solvent can be increased by heating and vibrating, so that the detection efficiency of heavy metals in the toy is improved.
103, adding dilute nitric acid into the plastic solution, placing the plastic solution in an ultrasonic oscillator for oscillating for a preset time, and then filtering the oscillated plastic solution to extract a filtrate containing heavy metals.
In the embodiments of the present invention, it is easy to know that the solution to be measured contains an organic solvent and also contains a heavy metal. After the filtration operation, the solution to be measured containing the organic solvent may be obtained by washing the solution with the same dilute nitric acid as described above and fixing the volume of the filtrate. Since the plastic solution obtained by dissolving the organic solvent is generally turbid, and heavy metals such as lead and cadmium in the dissolved plastic are adsorbed on the precipitate of the solution, the heavy metals need to be extracted by dilute nitric acid. The preset duration of the oscillation of the ultrasonic oscillator can be determined according to the set oscillation intensity, preferably 15-30 minutes, and the embodiment of the invention is not limited specifically.
And 104, determining the filtrate as the solution to be detected, and performing qualitative and quantitative analysis on the heavy metals in the solution to be detected by using anodic stripping voltammetry.
In the embodiment of the invention, the anodic stripping voltammetry is an electrochemical analysis method combining potentiostatic electrolytic enrichment and voltammetry measurement. The method can continuously measure various metal ions at one time, has high sensitivity, and can measure 10 < -7 > -10 < -9 > mol/L of metal ions, so that the method can be used for qualitatively and quantitatively analyzing the heavy metals in the solution to be detected.
Therefore, by implementing the detection method described in fig. 1, the plastic can be dissolved by using a proper organic solvent by utilizing the characteristic that the plastic has better solubility in the organic solvent, heavy metals in the plastic are extracted to form a solution to be detected containing the organic solvent, and qualitative and quantitative analysis is performed on the heavy metals in the solution to be detected by using an anodic stripping voltammetry, so that the process operation is simple and convenient, and the problem of effectively detecting the content of the heavy metals in toys for children, pigments and coatings is solved.
Referring to fig. 2, fig. 2 is a schematic flow chart of another method for detecting heavy metals in children's toys, paints and coatings according to an embodiment of the invention. As shown in fig. 2, the detection method may include the following steps:
in the embodiment of the invention, the method for detecting multiple heavy metals in children toys, pigments and coatings comprises steps 201-203, and for the description of the steps 201-203, please refer to the detailed description of the steps 101-103 in the first embodiment, which is not repeated in the embodiment of the invention.
And step 204, determining the filtrate as the solution to be detected.
In the embodiment of the invention, the solution to be detected can be electrolyzed under the condition of constant potential, so that metal ions in the solution to be detected are enriched on the working electrode and generate amalgam with mercury on the working electrode. For a given metal ion, if the stirring speed is constant and the pre-electrolysis time is fixed, then m = Kc, i.e. the amount of metal deposited is directly proportional to the concentration of the metal ion to be measured.
In this embodiment of the present invention, optionally, the working electrode may be an immune electrode or a nucleic acid aptamer electrode, and this embodiment of the present invention is not limited thereto.
The metal layer is reoxidized into ions using a reverse voltage applied to the working electrode, step 206.
In the embodiment of the present invention, after the enrichment in step 205 is completed, the device may be left at rest for 30s or 60s, and then a reverse voltage is applied to the working electrode to re-oxidize the metal in the amalgam into the ion-regressive solution by negative and positive scanning.
And step 207, recording the voltammetry curve of the solution to be detected, and performing qualitative and quantitative analysis on the heavy metals in the solution to be detected according to the voltammetry curve.
As an alternative embodiment, the qualitative and quantitative analysis of the heavy metal in the solution to be detected according to the voltammetry curve may include:
determining a peak potential value according to the position of a peak on the voltammetry curve, and using the peak potential value as a qualitative analysis basis of the heavy metal in the solution to be detected;
and determining the peak current of the voltammetry curve to be used as a quantitative analysis basis of the heavy metal in the solution to be detected.
Wherein the peak current is in direct proportion to the concentration of the metal ions to be detected in the solution to be detected.
In the embodiment of the invention, because the metal in the amalgam is re-oxidized into the ion regression solution, the oxidation current is generated, and the voltage-current curve, namely the volt-ampere curve, is recorded. The curve is in a peak shape, the peak current is in direct proportion to the concentration of the detected ions in the solution and can be used as the basis of quantitative analysis, and the peak potential can be used as the basis of qualitative analysis.
Therefore, by implementing the method for detecting various heavy metals in children toys, pigments and coatings described in fig. 2, the plastic can be dissolved by using a proper organic solvent by utilizing the characteristic of better solubility of the plastic in the organic solvent, the heavy metals in the plastic are extracted to form a solution to be detected containing the organic solvent, and the heavy metals in the solution to be detected are qualitatively and quantitatively analyzed by utilizing an anodic stripping voltammetry, so that the method is simple and convenient to operate, and the problem of effectively detecting the content of the heavy metals in the children toys, the pigments and the coatings is solved.
The present invention also provides an electronic device, including:
a processor;
the storage is stored with computer readable instructions, and when the computer readable instructions are executed by the processor, the detection method for the heavy metals in the children toys, the paint and the coating is realized.
In an exemplary embodiment, the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the method for detecting multiple heavy metals in children's toys, paints, and coatings as described above.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (6)
1. A method for detecting multiple heavy metals in toys for children, paints and coatings is characterized by comprising the following steps:
sampling the toy finished product to obtain a sample to be detected;
selecting a corresponding organic solvent according to the material type of the sample to be detected, putting the sample to be detected into a sealable container filled with the organic solvent, and heating and vibrating the sample to be detected to obtain a plastic dissolving solution;
adding dilute nitric acid into the plastic dissolving solution, placing the plastic dissolving solution in an ultrasonic oscillator for oscillation for a preset time, and then filtering the oscillated plastic dissolving solution to extract a filtrate containing heavy metals;
determining the filtrate as a solution to be detected, and carrying out qualitative and quantitative analysis on the heavy metal in the solution to be detected by using anodic stripping voltammetry.
2. The method according to claim 1, wherein the qualitative and quantitative analysis of the heavy metal in the solution to be detected by using anodic stripping voltammetry comprises:
electrolyzing the solution to be detected to ensure that metal ions in the solution to be detected are electrically reduced into atomic metal, so that a metal layer is enriched and formed on the surface of the working electrode;
re-oxidizing the metal layer to ions using a reverse voltage applied to the working electrode;
recording a voltammetry curve of the solution to be detected, and carrying out qualitative and quantitative analysis on the heavy metal in the solution to be detected according to the voltammetry curve.
3. The method of claim 2, wherein the working electrode is an immuno electrode or a aptamer electrode.
4. The method according to claim 2 or 3, wherein the qualitative and quantitative analysis of the heavy metal in the solution to be detected according to the voltammetry curve comprises:
determining a peak potential value according to the position of a peak on the voltammetry curve to serve as a qualitative analysis basis of the heavy metal in the solution to be detected;
and determining the peak current of the voltammetry curve to be used as a quantitative analysis basis of the heavy metal in the solution to be detected.
5. The method according to claim 4, wherein the peak current is proportional to the concentration of metal ions in the solution to be detected.
6. Method according to claim 1, characterized in that the material type is PVC, PE, PA, PET, PU, PP or PS plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010070412.8A CN111239232A (en) | 2020-01-21 | 2020-01-21 | Method for detecting multiple heavy metals in children toys, pigments and coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010070412.8A CN111239232A (en) | 2020-01-21 | 2020-01-21 | Method for detecting multiple heavy metals in children toys, pigments and coatings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111239232A true CN111239232A (en) | 2020-06-05 |
Family
ID=70867321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010070412.8A Pending CN111239232A (en) | 2020-01-21 | 2020-01-21 | Method for detecting multiple heavy metals in children toys, pigments and coatings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111239232A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034529A (en) * | 2021-11-11 | 2022-02-11 | 广东睿鹏材料科学有限公司 | Detection pretreatment method of anti-counterfeiting material containing trace fluorescent groups |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354652A (en) * | 1991-07-11 | 1994-10-11 | The University Of Maryland At Baltimore | Lead assay |
| US5391270A (en) * | 1993-08-11 | 1995-02-21 | General Electric Company | Detection and measurement of heavy metals |
| CN101074941A (en) * | 2007-06-21 | 2007-11-21 | 中国科学院长春应用化学研究所 | Method for producing carbon magma bismuth membrane electrode |
| CN104122218A (en) * | 2014-07-31 | 2014-10-29 | 深圳出入境检验检疫局玩具检测技术中心 | Method for detecting heavy metals in plastics |
-
2020
- 2020-01-21 CN CN202010070412.8A patent/CN111239232A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5354652A (en) * | 1991-07-11 | 1994-10-11 | The University Of Maryland At Baltimore | Lead assay |
| US5391270A (en) * | 1993-08-11 | 1995-02-21 | General Electric Company | Detection and measurement of heavy metals |
| CN101074941A (en) * | 2007-06-21 | 2007-11-21 | 中国科学院长春应用化学研究所 | Method for producing carbon magma bismuth membrane electrode |
| CN104122218A (en) * | 2014-07-31 | 2014-10-29 | 深圳出入境检验检疫局玩具检测技术中心 | Method for detecting heavy metals in plastics |
Non-Patent Citations (1)
| Title |
|---|
| 吴敦虎 等: "阳极溶出伏安法测定塑料制品中的铜和铅", 《分析测试学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034529A (en) * | 2021-11-11 | 2022-02-11 | 广东睿鹏材料科学有限公司 | Detection pretreatment method of anti-counterfeiting material containing trace fluorescent groups |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Pauliukaitė et al. | Characterization and application of bismuth‐film modified carbon film electrodes | |
| Carrera et al. | Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles | |
| JP6022480B2 (en) | Aqueous amino acid sensor with molecularly imprinted conductive polymer film | |
| Alizadeh et al. | An extraordinarily sensitive voltammetric sensor with picomolar detection limit for Pb2+ determination based on carbon paste electrode impregnated with nano-sized imprinted polymer and multi-walled carbon nanotubes | |
| Zhang et al. | High sensitive on-site cadmium sensor based on AuNPs amalgam modified screen-printed carbon electrodes | |
| Jayaprakash et al. | Quantum chemical and electrochemical studies of lysine modified carbon paste electrode surfaces for sensing dopamine | |
| CN105067691B (en) | Synchronous detection mercury, copper, lead, the preparation method of the electrochemical sensor of cadmium ion content | |
| CN111239232A (en) | Method for detecting multiple heavy metals in children toys, pigments and coatings | |
| CN112485317A (en) | Electrochemical method and device for detecting bisphenol A | |
| CN106248769B (en) | The method for detecting hydroquinone concentration in solution | |
| Pickup et al. | Extraction of silver by polypyrrole films upon a base–acid treatment | |
| Hu et al. | An electrochemical sensor based on ion imprinted PPy/rGO composite for Cd (II) determination in water | |
| CN104730132A (en) | Graphene modified electrode as well as preparation and rapid detection on phoxim | |
| CN104237361B (en) | Detect Cd based on Cys/graphene modified electrode simultaneously2+、Pb2+Electrochemical method | |
| CN103402327B (en) | A kind of manufacture method printed electrode for Portable heavy metal detection | |
| CN107179345A (en) | Using two step electro-deposition and the heavy metal-polluted soil Voltammetric detection method of dissolution step | |
| CN109444229B (en) | Electrochemical method for detecting trace mercury ions | |
| Jayaprakash et al. | Pre/post electron transfer regioselectivity at glycine modified graphene electrode interface for voltammetric sensing applications | |
| Wu et al. | Shrink-induced microelectrode arrays for trace mercury ions detection | |
| CN104034772A (en) | Preparation method and application of modification electrode | |
| CN105158318B (en) | A kind of preparation method for the electrochemical sensor for detecting polycyclic aromatic hydrocarbon | |
| Beneš et al. | The use of anodic stripping voltammetry for determination of the concentration and forms of existence of lead in natural waters | |
| Ramanaviciene et al. | Molecularly imprinted polypyrrole for sensor design | |
| Mariame et al. | Determination of traces of copper by anodic stripping voltammetry at a rotating carbon paste disk electrode modified with poly (1, 8-diaminonaphtalene) | |
| Tsai et al. | Electrochemical Detection of 2‐Naphthol at a Glassy Carbon Electrode Modified with Tosflex Film |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200605 |