Rapid screening method for lead, arsenic and mercury in cosmetics

A fast technology for cosmetics, applied in the rapid screening of mercury, lead and arsenic in cosmetics, it can solve the problems of influential, time-consuming and complicated final determination results, and achieve the saving of supervision time and cost, high sensitivity and accuracy high effect

Inactive Publication Date: 2012-06-20
广东省药品检验所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, sample pretreatment (e.g. wet digestion) is necessary in order to remove possible contaminants

Method used

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  • Rapid screening method for lead, arsenic and mercury in cosmetics
  • Rapid screening method for lead, arsenic and mercury in cosmetics
  • Rapid screening method for lead, arsenic and mercury in cosmetics

Examples

Experimental program
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Effect test

preparation example Construction

[0037] The preparation of sodium mercaptoethanesulfonate modified gold electrode comprises the following steps:

[0038] 1) Gold electrodes with a diameter of 2 mm were coated with 1.0, 0.3 and 0.05 μm Al 2 o 3 The powder was polished on suede, ultrasonically cleaned 3 times in ultrapure water for 2–3 min each time, and then washed in 0.5 M H 2 SO 4 A cyclic voltammetry scan from 0 V to 1.5 V was carried out in the solution until the signal was stable, and a pretreated gold electrode was obtained;

[0039] 2) Soak the pretreated gold electrode in a modification solution containing 2.5 mM sodium mercaptoethanesulfonate and 0.1 M perchloric acid for 20–60 min, and then ultrasonically clean it in ultrapure water for 5 min to obtain mercaptoethanesulfonate NaCl modified gold electrodes.

Embodiment 1

[0041] The rapid screening method for lead and mercury in cosmetics includes the following steps:

[0042] 1) Preparation of standard solution: take appropriate amount of standard stock solutions of lead and mercury respectively, and dilute them with 1 M HCl until the concentrations of lead and mercury are 400 PPb and 10 PPb respectively, to obtain standard solutions;

[0043] 2) With the above-mentioned sodium mercaptoethanesulfonate modified gold electrode as the working electrode, and the Ag / AgCl electrode as the reference electrode, a portable electrochemical detector is used to detect the standard solution by stripping voltammetry, and the detection parameters are set to: initial potential- 0.4 V, termination potential +0.65 V, potential increment 4 mV, pulse amplitude 20 mV, frequency 40 Hz, resting time 2 s, deposition potential -0.4 V, deposition time 120 s, record data, draw standard current-voltage curve picture;

[0044] 3) Sample solution preparation: weigh about...

Embodiment 2

[0051] The rapid screening method for arsenic and mercury in cosmetics includes the following steps:

[0052] 1) Preparation of standard solution: Take an appropriate amount of standard stock solution of arsenic and mercury respectively, dilute it with 1 M HCl until the concentrations of arsenic and mercury are 100 PPb and 10 PPb respectively, to obtain a standard solution;

[0053] 2) With the above-mentioned sodium mercaptoethanesulfonate modified gold electrode as the working electrode, and the Ag / AgCl electrode as the reference electrode, a portable electrochemical detector is used to detect the standard solution by stripping voltammetry, and the detection parameters are set as follows: initial potential- 0.2 V, termination potential +0.65 V, potential increment 4 mV, pulse amplitude 20 mV, frequency 40 Hz, resting time 2 s, deposition potential -0.6 V, deposition time 60 s, record data, draw standard current-voltage curve picture;

[0054] 3) Preparation of sample soluti...

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Abstract

The invention discloses a rapid screening method for lead, arsenic and mercury in cosmetics. The rapid screening method comprises the simultaneous and rapid screening of lead and mercury or the simultaneous and rapid screening of arsenic and mercury and comprises the following steps of: taking the cosmetics to be detected, dissolving the cosmetics in a HCl solution, and obtaining a sample solution; taking a chemical modified electrode as a working electrode, taking a Ag/AgCl electrode as a reference electrode, carrying out stripping voltammetry detection on the sample solution, and recording data; and judging whether the lead or the arsenic or the mercury in the cosmetics to be detected is overproof according to the spike potentials and the peak currents of the lead and the mercury or the arsenic and the mercury in the sample solution. The rapid screening method disclosed by the invention is high in accuracy and high in sensitivity, the detection limits of the lead, the arsenic and the mercury are respectively 100 ppb, 25 ppb and 2.5ppb, and thus, the technical requirements on on-site rapid screening can be ensured; and the rapid screening method is simple and convenient in operation, the time and the cost for supervision can be greatly saved, and the supervision efficiency is increased.

Description

Technical field [0001] The present invention is the field of cosmetics testing, involving the fast screening method of lead, arsenic, and mercury in cosmetics. Background technique [0002] At present, the hazards caused by heavy metals have received attention in the whole society, especially in recent years, the poisoning and harmful incidents caused by heavy metals have greatly increased people's awareness of heavy metals.Heavy metal content, as an important quality control indicator, also requires strict control in the cosmetics industry.As a daily necessities that people often use, their safety is closely related to people's health. Cosmetics stay in the skin, face, hair and other parts for a long time. If the cosmetics contain heavy metals exceeding a certain levelharm.For example, heavy metal lead poisoning can damage the nervous system, digestive system, and hematopoietic system, and can also cause severe renal damage.Comecades accumulate in human tissues. Long -term conta...

Claims

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Application Information

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IPC IPC(8): G01N27/48G01N27/30
Inventor 方继辉刘亚雄
Owner 广东省药品检验所
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