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Method for determining total organic carbon content in water

A technology for total organic carbon content and water determination, applied in measuring devices, instruments, scientific instruments, etc., can solve the problem of not formulating TOC standard analysis methods, etc., and achieve the effects of fast measurement speed, reduction of dosage, and high accuracy of analysis results.

Inactive Publication Date: 2017-09-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] According to different oxidation technologies and detection methods, countries around the world have researched and developed various total organic carbon analyzers, but my country has not yet formulated a standard analysis method for TOC

Method used

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  • Method for determining total organic carbon content in water
  • Method for determining total organic carbon content in water
  • Method for determining total organic carbon content in water

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Embodiment

[0034] (1) Sample pretreatment: Take 150mL water sample in a glass beaker, filter it with a cleaned and air-dried glass filter and a suction filter bottle, and collect the filtrate in a glass bottle with a cover;

[0035] Take 3.0mL of the filtrate and add it to the headspace vial, add 1.5mL of 98% w / w sulfuric acid solution to the headspace vial, wait for the solution in the headspace vial to cool to room temperature, then add 0.5mL of 0.2mol / w to the headspace vial L potassium dichromate solution, then immediately seal the headspace bottle, shake it up, and place it in a constant temperature water bath (100°C) for redox reaction; after 60min, take out the headspace bottle and cool it to room temperature, for headspace gas chromatography analysis.

[0036] (2) Establish a standard curve: replace the filtrate gained in step (1) with known TOC standard solutions of different concentrations, place it in a headspace bottle, and then carry out the oxidation-reduction reaction desc...

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Abstract

The invention discloses a method for determining total organic carbon content in water, particularly a method for determining TOC (total organic carbon) in water by utilizing phase reaction transformation headspace gas chromatography, which includes: (1) sample pretreatment; (2) creation of a standard curve; (3) testing of a sample by headspace gas chromatography; (4) result calculation. The phase reaction transformation headspace gas chromatography measure is utilized to determine a chromatographic signal value of carbon dioxide transformed after the oxidation reaction of each component, so that the content of the TOC in the water is indirectly obtained. not only can the operation process be simplified, but also the dosages of chemical reagents, such as mercury sulfate and silver sulfate, can be greatly reduced, consequently, secondary pollution is prevented, and the tenet of green chemistry is met. The method disclosed by the invention is particularly applicable to the analysis of large batches of samples in labs and units related to water quality monitoring.

Description

technical field [0001] The invention relates to the field of environmental quality monitoring, in particular to a method for measuring the content of total organic carbon (TOC) in water. Background technique [0002] In order to evaluate the pollution degree of organic matter in water bodies, the indicators that characterize the content of organic pollutants in water bodies at home and abroad for a long time include chemical oxygen demand (CODcr), permanganate index (COD Mn ), five-day biochemical oxygen demand (BOD 5 ) and total organic carbon (TOC). The COD value represents the degree of oxidation of organic pollutants in water or the reduction ability of pollutants. The COD value is a conditional index, which is greatly affected by the type and concentration of the oxidant added, the acidity of the solution, the reaction temperature and time, and the catalyst. CODcr on-line monitors have problems such as long analysis time, complicated operation and maintenance, and se...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N30/06G01N30/16
CPCG01N30/88G01N30/06G01N30/16G01N2030/884
Inventor 彭容何亮柴欣生
Owner SOUTH CHINA UNIV OF TECH
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