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Qualitative and semiquantitative lead detection test paper and application thereof

A detection test paper and semi-quantitative technology, which is applied in the direction of analyzing materials through chemical reactions and observing the impact on chemical indicators. It can solve the problem of large amount of chemical solvents, inability to quickly detect lead, complicated operations, etc. problem, to achieve the effect of high detection accuracy, good use prospect and simple operation

Inactive Publication Date: 2012-07-11
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods have respectively adopted atomic absorption spectrophotometer and spectrophotometer as detection instruments, adopting atomic absorption spectrophotometer can carry out accurate qualitative and quantitative analysis of heavy metal lead, but atomic absorption spectrophotometer is relatively expensive, which is not conducive to the The promotion of the method; the dithizone method uses the highly toxic substance potassium cyanide, which undoubtedly increases the safety risk of the testing personnel; and these two methods are time-consuming, complicated to operate, and the amount of added chemical solvents is likely to cause pollution, etc. Naturally, it cannot be used as a popularization method for the rapid detection of lead in cosmetics

Method used

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  • Qualitative and semiquantitative lead detection test paper and application thereof
  • Qualitative and semiquantitative lead detection test paper and application thereof
  • Qualitative and semiquantitative lead detection test paper and application thereof

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Embodiment 1

[0039] Preparation of chromogen solution A: Accurately weigh 4.001×10 -2 g xylenol orange (40mg / kg), 0.001g thiourea, 0.001g cysteine, 0.001g modified starch (modified starch in the embodiment all adopts YZ-138 modified cationic cross-linked starch produced by Hangzhou Paper Friends Technology). modified starch), and then use a volumetric flask to set the volume to 1000mL; immerse the slow quantitative filter paper in the color developer solution A, fully soak it, take it out, and dry it quickly in the dark to obtain the color test paper A.

[0040] Prepare chromogenic agent solution A': Accurately weigh 2.501×10 -2 g xylenol orange (25mg / kg), 0.001g thiourea, 0.001g cysteine, 0.001g starch, and then use a volumetric flask to set the volume to 1000mL; immerse the slow quantitative filter paper in the developer solution A', After fully soaking, take it out, avoid light and quickly dry to obtain color test paper A'.

[0041] Prepare chromogenic agent solution A": Accurately we...

Embodiment 2

[0045] Preparation of buffer solution: Accurately weigh 1.02537g NaAc and dissolve it in deionized water, add 0.71554ml HAc, then dilute to 250ml for later use. The pH of this buffer solution was 4.76. If it is necessary to configure buffers with different pH values, it is only necessary to change the amount of HAc added.

Embodiment 3

[0046] Embodiment 3: investigate the impact of xylenol orange concentration on test paper determination

[0047] The color test paper A, A', A " that above-mentioned different concentrations xylenol orange obtains, respectively adopts three parts of 5ml 40mg / kg standard lead solution, adds the buffer solution that 5ml embodiment 2 is prepared successively, makes the volume of solution Control it at 10ml, and check the pH of the mixed solution with a pH meter. The pH value at this time is about 4.7, which meets the pH range we need. Insert the color test papers A, A', and A" into the above three mixed solutions , A becomes dark purple; A' is light purple, very light in color and difficult to distinguish with the naked eye; A" becomes dark purple and dark in color, which is closer to the color of the xylenol orange solution and difficult to distinguish with the naked eye. Therefore, two The concentration of cresol orange is between 30 and 50 mg / kg.

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Abstract

The invention discloses qualitative lead detection test paper and semiquantitative lead detection test paper and application thereof. The qualitative lead detection test paper comprises developing test paper A which is obtained by the steps of soaking low-speed quantitative filter paper in a developer solution A, taking the low-speed quantitative filter paper out, and drying the low-speed quantitative filter paper at low temperature; the developer solution A is prepared from xylenol orange, thiourea, aminothiopropionic acid, modified starch and deionized water; and in the developer solution A, the concentration of the xylenol orange is 30 to 50mg / kg, the concentration of thiourea is 1 to 10mg / kg, the concentration of the aminothiopropionic acid is 1 to 10mg / kg, and the modified starch is 1 to 5mg / kg. The difference between the semiquantitative lead detection test paper and the qualitative lead detection test paper is that: a developer solution B which is used by the semiquantitative lead detection test paper contains ethylene diamine tetraacetic acid disodium salt at the concentration of 23.43mg / L except substances contained in the developer solution A. The qualitative lead detection test paper and the semiquantitative lead detection test paper can be used for qualitative and semiquantitative detection of lead in water cosmetics.

Description

(1) Technical field [0001] The invention relates to qualitative and semi-quantitative lead detection test paper and its application, especially the application in detection of lead content in water-based cosmetics. (2) Background technology [0002] Lead is the only trace element not needed by the human body. It is a stable non-degradable pollutant and a heavy metal element that seriously endangers human health. According to reports, for people who have been exposed to trace amounts of lead for a long time, the accumulated lead can hinder the formation of blood cells, leading to mental decline, low academic and work performance; when the accumulation reaches a certain level, people will have chronic mental disorders, nightmares, insomnia, headaches, etc. Symptoms of poisoning; severe cases may also have fatigue, loss of appetite, nausea, abdominal distension, abdominal pain or diarrhea. Lead can also enter the brain tissue through the blood, damage the cerebellum and cerebr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 叶子弘俞晓平付贤树崔海峰李佳
Owner CHINA JILIANG UNIV
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