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Preparation method of benzene series mixed solution standard substance in carbon bisulfide

A technology of standard substance and mixed solution, which is applied in the field of preparation of standard substance of benzene series mixed solution in carbon disulfide, can solve the problems of inconvenient detection work, inconvenient analysis and inspection, and interference of detection work, so as to improve detection work efficiency and reduce interference factors Effect

Active Publication Date: 2015-05-20
BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Most of the existing benzene series standard substances in our country are solution standard substances with a single component, while the benzene series in the environment mostly exist with several components at the same time, which brings inconvenience to the detection work
At present, the types of benzene series in similar standard substances are all less than 6, which brings inconvenience to the analysis and inspection work; and the existing solvents of benzene series solution standard substances are mostly methanol, which interferes with the detection work, while the national standard GBZ / The detection standard used in T 160.42-2007 "Determination of Aromatic Hydrocarbon Compounds in Air Toxic Substances in the Workplace" has been changed to a mixed standard solution of benzene series with carbon disulfide as the solvent

Method used

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  • Preparation method of benzene series mixed solution standard substance in carbon bisulfide

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preparation example Construction

[0020] figure 1 Shown is the flow chart of the preparation method of benzene series mixed solution standard substance in carbon disulfide of the present invention, as can be seen from the figure, this method comprises the following steps:

[0021] Step S11: preparing a stock solution;

[0022] According to the concentration requirements of the standard substance of the mixed solution of benzene series, weigh pure benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene respectively in different volumetric flasks, add benzene-free carbon disulfide to dissolve and Dilute and mix to form stock solution respectively; and carry out concentration test for each stock solution to determine its exact concentration. Wherein, when weighing each benzene series, the weight of pure benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene can be accurately weighed according to the amount of each benzene series required. 0.0001g. In order to obtain the required concentration ...

Embodiment

[0033] The present invention is further described in detail below with the preparation of the mixed solution standard substance whose concentration of benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene in the mixed solution standard substance should be 1.00 mg / mL.

[0034] First, according to the concentration requirements of the standard substance of the mixed solution of benzene series, weigh 2.50000g of pure benzene, toluene, ethylbenzene, o-xylene, m-xylene and p-xylene respectively in different 250mL volumetric flasks, and add Dissolve and dilute benzene-free carbon disulfide to the scale of 250mL, and mix well to form stock solutions respectively; at this time, the concentration of benzene series in each stock solution should be 10.00mg / mL, which is 10 times the concentration of the standard substance in the required mixed solution; Test the concentration of each stock solution to determine its exact concentration; then draw each stock solution (100.00±X)mL i...

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Abstract

The invention discloses a preparation method of a benzene series mixed solution standard substance in carbon bisulfide, which comprises the following steps of: firstly, respectively weighing benzene series and feeding the benzene series in different volumetric flasks according to the requirement of the required benzene series mixed solution standard substance on the concentration; adding benzene-free carbon bisulfide for dissolving and diluting to respectively form stock solutions and checking the accurate concentration; respectively absorbing the stock solutions to a same volumetric flask according to the accurate concentration of each stock solution; adding the benzene-free carbon bisulfide for diluting to enable the concentration of the benzene-free carbon bisulfide to reach the requirement; uniformly mixing the stock solutions and the benzene-free carbon bisulfide to form a mixed solution standard substance; detecting the accurate concentration of the mixed solution standard substance; and finally, filling the mixed solution standard substance in a glass ampoule and sealing in a melting. According to the benzene series mixed solution standard substance prepared in the invention, the benzene-free carbon bisulfide is taken as a solvent and the mixed solution standard substance is consistent with a standard solution in a national standard testing method, so that the detection work efficiency is improved, interference factors in analysis are reduced and the benzene series mixed solution standard substance is more specified and standardized.

Description

technical field [0001] The invention relates to the field of research and development of standard substances for water quality analysis and environmental chemical analysis, in particular to a preparation method for standard substances of a mixed solution of benzene series in carbon disulfide. Background technique [0002] At present, the government and the public pay more and more attention to environmental protection. More and more projects have been launched in the monitoring of water quality, air and environmental pollution. Among them, the organic pollutant benzene series has been approved by the environmental monitoring and disease prevention and control departments Listed as daily inspection items. Therefore, the requirements for benzene series standard substances are getting higher and higher. [0003] The National Occupational Health Standard of the People's Republic of China GBZ / T 160.42-2007 "Determination of Aromatic Hydrocarbon Compounds in Air Toxic Substances ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/38
Inventor 李力王叔淳刘艳丽王欢李蕴翔
Owner BEIJING HAIAN HONGMENG STANDARD SUSNCE TECH