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Standard sample for headspace analysis of trace benzene in water, preparation method thereof and method for determining trace benzene in water using it

A standard sample and water determination technology, applied in the detection field, can solve problems such as interference with benzene determination

Active Publication Date: 2016-08-10
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low boiling point of methanol, only 64.5°C, it evaporates together with benzene during headspace analysis, which interferes with the determination of benzene

Method used

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  • Standard sample for headspace analysis of trace benzene in water, preparation method thereof and method for determining trace benzene in water using it
  • Standard sample for headspace analysis of trace benzene in water, preparation method thereof and method for determining trace benzene in water using it
  • Standard sample for headspace analysis of trace benzene in water, preparation method thereof and method for determining trace benzene in water using it

Examples

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Effect test

Embodiment 1

[0075] The preparation method provided by the present invention for headspace analysis of trace benzene standard samples in water:

[0076] (1) Preparation of benzene standard sample: Weigh 0.1g of benzene in 100g of sulfolane and shake well. The standard sample concentration of benzene is 1000mg / kg.

[0077] (2) Preparation of benzene intermediate solution: Weigh 1g of benzene standard sample into a 1000mL volumetric flask and dilute with water to the mark. The concentration of benzene intermediate solution is 1mg / L.

[0078] (3) Preparation of benzene working solution: Pipette 0.5mL, 2.5mL, 5mL, 7.5mL, 10mL of benzene intermediate solution into a 100mL volumetric flask, dilute with water to the mark. The concentration of benzene working solution is 0.005mg / L, 0.025mg / L, 0.05mg / L, 0.075mg / L, 0.1mg / L.

[0079] (4) Draw the working curve: pipette 10mL of benzene working solution into the headspace bottle, add about 4g (3.95g~4.05g) of sodium chloride, cover the bottle cap, p...

Embodiment 2

[0097] The preparation method provided by the present invention for headspace analysis of trace benzene standard samples in water:

[0098] (1) Preparation of benzene standard sample: Weigh 0.1g of benzene in 100g of dimethyl sulfoxide and shake well. The standard sample concentration of benzene is 1000mg / kg.

[0099] (2) Preparation of benzene intermediate solution: Weigh 1g of benzene standard sample into a 1000mL volumetric flask and dilute with water to the mark. The concentration of benzene intermediate solution is 1mg / L.

[0100] (3) Preparation of benzene working solution: Pipette 0.5mL, 2.5mL, 5mL, 7.5mL, 10mL of benzene intermediate solution into a 100mL volumetric flask, dilute with water to the mark. The concentration of benzene working solution is 0.005mg / L, 0.025mg / L, 0.05mg / L, 0.075mg / L, 0.1mg / L.

[0101] (4) Draw the working curve: pipette 10mL of benzene working solution into the headspace bottle, add about 4g (3.95g~4.05g) of sodium chloride, cover the bott...

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Abstract

The invention provides a standard sample used for headspace analysis of trace quantity benzene in water and a method for measuring trace quantity benzene in water by using the method thereof. The method comprises the following step of dissolving a benzene solution in a polarity sulfone organic solvent with high boiling point and capable of dissolving with water and benzene to obtain the standard sample. When in use, the standard sample is diluted by water to the required concentration; wherein the mass ratio of benzene to polarity sulfone organic solvent is 1: 100-1: 1000. According to the invention, benzene concentration in the standard sample can be increased, expiry data of the standard sample is prolonged to more than 1 year; benzene sampling weight is increased, weighing error is reduced, and the weighing relative error is reduced from 10% to 1%. The invention also provides a method for measuring trace quantity benzene in water by using the standard sample, and the standard sample does not influence the benzene measurement in headspace analysis.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a standard sample for headspace analysis of trace benzene in water, a preparation method thereof and a method for using the standard sample headspace analysis to measure trace benzene in water. Background technique [0002] Headspace analysis, that is, headspace gas chromatography analysis, is an analysis mode of gas chromatography. It is to place the sample in a closed container, and after reaching equilibrium at a certain temperature and pressure, take the upper gas phase part for chromatographic analysis. Widely used in the analysis of volatile components in complex samples. [0003] In the field of water quality monitoring, for example, when measuring trace amounts of benzene in drinking water, surface water, and waste water, it is necessary to prepare standard samples of benzene in water. [0004] There are two current common methods for preparing standard sam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/06G01N30/02
Inventor 苏鸿
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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