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A method for simultaneous determination of two organic lead salts in a plastic sample

A technology of salt content and organic lead, applied in the field of detection of harmful substances in plastic samples, can solve problems such as the determination method of lead phthalate without dibasic base, and achieve the effect of simple method

Active Publication Date: 2017-01-18
谱尼测试集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no method for the determination of C16-18 fatty acid lead and dibasic lead phthalate

Method used

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  • A method for simultaneous determination of two organic lead salts in a plastic sample
  • A method for simultaneous determination of two organic lead salts in a plastic sample
  • A method for simultaneous determination of two organic lead salts in a plastic sample

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Embodiment 1

[0059] (1) Drawing of the standard curve: take 1000 μg / mL standard solutions of dimethyl phthalate, methyl palmitate and methyl stearate and prepare a series of standard solutions with n-hexane, and standard solutions of dimethyl phthalate The concentration of the solution was 2.0, 5.0, 10.0, 20.0, 25.0 μg / mL, and analyzed by gas chromatography-mass spectrometer. The concentration of the standard solution is taken as the abscissa, and the peak area is taken as the ordinate.

[0060] Dimethyl phthalate standard curve linear equation Y=34705X, correlation coefficient R 2 =0.9990;

[0061] Methyl palmitate standard curve linear equation Y=216144X, correlation coefficient R 2 =0.9999;

[0062] Methyl stearate quasi-curve linear equation Y=24995X, correlation coefficient R 2 =0.9997;

[0063] (2) Analysis steps: Take a plastic toy sample and place it in a freezer pulverizer to pulverize it and mix it evenly. Weigh 1.0 g of the treated sample (accurate to 0.0001 g) into a stop...

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Abstract

The invention relates to a method for simultaneously determining the content of two organic lead salts in a plastic sample. The method is characterized by comprising the following steps: after crushing and grinding the plastic sample, determining methyl palmitate, methyl stearate and dimethyl phthalate before and after methyl esterification by using GC-MS, wherein C16-C18 fatty acid lead salt methyl esterification products comprise methyl palmitate and methyl stearate, and a dibasic lead phthalate methyl esterification product is dimethyl phthalate; subtracting the amount before the methyl esterification from a total value after the methyl esterification to obtain values of C16-C18 fatty acid lead salt and dibasic lead phthalate; detecting the content of total lead in the sample by using microwave acid digestion-ICP-OES; and calculating the content of C16-C18 fatty acid lead and dibasic lead phthalate according to the amount of lead substances, the determined content of methyl palmitate, methyl stearate and dimethyl phthalate, and the content of C16-C18 fatty acid lead, which is the sum of the content of methyl palmitate and methyl stearate.

Description

technical field [0001] The invention relates to the field of detection of harmful substances in plastic samples. Specifically, the invention relates to a method for simultaneously determining the contents of C16-18 fatty acid lead and dibasic lead phthalate in plastic samples. Background technique [0002] C16-18 fatty acid lead salt, English name Fatty acids, C16-18, lead salts, mainly including lead palmitate and lead stearate, white powder, insoluble in water, soluble in hot ethanol, benzene and turpentine, in n-hexane It dissolves by heating and turns into jelly after cooling, and decomposes into stearic acid and corresponding salts in case of strong acid, which is hygroscopic. It is mainly used as a smoothing agent and transparent softener for rubber products. [0003] [0004] C16-18 fatty acid lead structure formula [0005] Dibasic lead phthalate, English name Dibasic lead phthalate, CAS No. 69011-06-9, molecular formula C 8 h 4 o 6 Pb 3 , Molecular weight 8...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/88
Inventor 宋薇
Owner 谱尼测试集团股份有限公司