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Method for detecting artificially synthesized pigment by derivative voltammetry

A technology of artificial synthesis of pigments and voltammetry, applied in the direction of electrochemical variables of materials, etc., to achieve the effect of low detection limit, good anti-interference performance and low cost

Pending Publication Date: 2020-09-11
广州钰芯传感科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After reviewing the literature, it is found that the application of differential voltammetry to the detection of colorants is mostly for the detection of a single component, and some are for two components. It is rare to report the simultaneous determination of a multi-component mixture.

Method used

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  • Method for detecting artificially synthesized pigment by derivative voltammetry
  • Method for detecting artificially synthesized pigment by derivative voltammetry
  • Method for detecting artificially synthesized pigment by derivative voltammetry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Detection of synthetic pigments by derivative voltammetry:

[0040] A three-electrode system was used, with a suspended mercury electrode as the working electrode, an Ag / AgCl electrode as the reference electrode, and a platinum wire electrode as the counter electrode. The mixed pigments were qualitatively and quantitatively analyzed by linear scanning differential voltammetry for 1.5 times. Specifically using 0.10mol / L of Na 2 HPO 4 -KH 2 PO 4 The buffer solution is an electrolyte solution, its pH is 6.6, the enrichment potential is set at -0.15V, the static time is 120 seconds, and the scanning speed is 0.05V / s.

Embodiment 2

[0042] Detection of synthetic pigments by derivative voltammetry:

[0043] A three-electrode system was used, with a suspended mercury electrode as the working electrode, an Ag / AgCl electrode as the reference electrode, and a platinum wire electrode as the counter electrode. The mixed pigments were qualitatively and quantitatively analyzed by linear scanning differential voltammetry for 1.5 times. Specifically using 0.15mol / L of Na 2 HPO 4 -KH 2 PO 4 The buffer solution is an electrolyte solution, its pH is 6.6, the enrichment potential is set at -0.15V, the static time is 120 seconds, and the scanning speed is 0.05V / s.

Embodiment 3

[0045] Detection of synthetic pigments by derivative voltammetry:

[0046] A three-electrode system was used, with a suspended mercury electrode as the working electrode, an Ag / AgCl electrode as the reference electrode, and a platinum wire electrode as the counter electrode. The mixed pigments were qualitatively and quantitatively analyzed by linear scanning differential voltammetry for 1.5 times. Specifically using 0.10mol / L of Na 2 HPO 4 -KH 2 PO 4 The buffer solution is an electrolyte solution, its pH is 7.4, the enrichment potential is set to -0.15V, the static time is 120 seconds, and the scanning speed is 0.05V / s .

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Abstract

The invention provides a method for detecting an artificially synthesized pigment by derivative voltammetry. On the basis of an electrochemical analysis method, the differential voltammetry for simultaneously determining the five mixed artificially synthesized pigments is established. The method can be used for simply, conveniently and quickly detecting the multi-component colorant mixture, and has good anti-interference performance and relatively low detection limit. The detection limit for detecting the synthetic pigment amaranth is 0.03 [mu]g / mL, the detection limit for detecting sunset yellow is 0.005 [mu]g / mL, the detection limit for detecting lemon yellow is 0.005 [mu]g / mL, the detection limit for detecting carmine is 0.05 [mu]g / mL, and the detection limit for detecting erythrosine is 0.05 [mu]g / mL.

Description

technical field [0001] The invention belongs to the field of electrochemical detection, and relates to a method for detecting artificially synthesized pigments by using derivative voltammetry. Background technique [0002] Food coloring agents are divided into natural pigments and synthetic pigments. The advantages of synthetic pigments are bright color, strong tinting strength, stable properties, not easy to fade, low dosage, optional color matching, and low price. However, synthetic pigments are mainly chemically synthesized from benzene, toluene, naphthalene, etc., and mainly belong to aniline pigments. On the one hand, synthetic pigments have certain toxicity due to the mixture of intermediate products; on the other hand, some pigments can form carcinogenic substances β-naphthylamine and α-aminonaphthol in the human body. Therefore, all countries strictly control the scope of use, the type of use and the amount of use. Our country allows the use of 10 pigments includin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 奚亚男胡淑锦
Owner 广州钰芯传感科技有限公司
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