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Method for testing overproof of mercury contained in spot-removing cream

A detection method and technology of freckle cream, which are applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problems of poor reproducibility of results and complicated operation, and achieve the accuracy rate. High, simple operation, fast detection effect

Inactive Publication Date: 2008-12-24
SHANGHAI QIBAO HIGH SCHOOL
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Problems solved by technology

The existing national standard method for the detection of mercury ions is cold atomic absorption method, which is complicated to operate, and the reproducibility of the results is poor, and it needs to be measured in a professional laboratory

Method used

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  • Method for testing overproof of mercury contained in spot-removing cream

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Embodiment Construction

[0010] Such as figure 1 Shown, aminomercuric chloride contains Hg (NH 2 ) + The zigzag chain structure of the unit, N-Hg-N is a linear structure. Two H atoms and two Hg atoms around N atoms form a tetrahedral structure; besides two N atoms around each Hg atom, there are four Cl - Coordination forms a distorted octahedral structure. The chains are bridged by the shared coordination Cl atoms, and the coordination Cl atoms in the bridge bond - It is not easy to ionize, and the valence bond of the N atom has reached saturation, there is no lone pair of electrons, and it is positively charged, H + Positively charged N atoms cannot be accessed. Ammonium mercury complexes of this structure are quite stable in non-coordinating acids. But if stronger than -NH 2 When the ligand attacks Hg (such as Br - , I - 、SCN - etc.), which will weaken the Hg-N coordination bond and transform it into a soluble complex ion.

[0011] Aminomercuric chloride is insoluble in water, alcohol and...

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Abstract

The invention relates to a detection method for detecting hydrargyrum contained in removing-freckle cream, which is characterized in that a CuI reagent is prepared; a small amount of removing-freckle cream is plastered on filter paper and the CuI test solution dropped on the paper and the phenomenon is observed; if the colour of henna or salmon pink appears, the ammoniated mercuric chloride in the removing-freckle cream severely exceeds the standard. The method of the invention has simple operation and quick detection speed and has low detection condition requirement; the quality legal operation department can complete the detection of the hydrargyrum contained in the removing-freckle cream in site; furthermore, the test result has strong specificity and high exactness.

Description

technical field [0001] The invention belongs to the technical field of cosmetic detection, in particular to a method for detecting mercury in freckle-removing cream. Background technique [0002] Aminomercuric chloride, the chemical formula is Hg(NH 2 )Cl, commonly known as white mercury, is often illegally added to freckle-removing cosmetics. Because high-concentration mercury-containing cosmetics will cause liver and kidney damage, and even lead to mercury poisoning and uremia. It is very important to measure the mercury content in the freckle cream for this reason. The existing national standard method for mercury ion detection is cold atomic absorption method, which is complicated to operate, the reproducibility of the results is poor, and it needs to be measured in a professional laboratory. Contents of the invention [0003] The object of the present invention is to provide a method for detecting mercury in freckle cream. [0004] In order to achieve the above-men...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 黎良枝陆雨薇段李平傅星远
Owner SHANGHAI QIBAO HIGH SCHOOL
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