Sample pretreatment method, halogen content detection method and application

A sample pretreatment and detection method technology, applied in the field of chemical analysis, can solve problems such as the accuracy of halogen test results to be improved and inaccurate testing, and achieve the effect of increasing accuracy and improving recovery rate
CN112557142APending Publication Date: 2021-03-26广州博诺通技术股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
广州博诺通技术股份有限公司
Publication Date
2021-03-26

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Abstract

The invention discloses a sample pretreatment method, a halogen content detection method and application, and relates to the technical field of analytical chemistry. The sample pretreatment method comprises the following steps: reacting a to-be-detected sample with a first iodide aqueous solution to obtain an intermediate sample; reacting the intermediate sample with a calcium hydroxide aqueous solution, and performing filtering to obtain a defluorination sample. The halogen content detection method comprises the following steps: pretreating a sample by adopting the pretreatment method; respectively detecting the ion content in the intermediate sample and the defluorination sample by adopting an ion chromatography method, and subtracting the measured ion content of the peak appearing in the defluorination sample for 2-4 minutes from the measured ion content of the peak appearing in the intermediate sample for 2-4 minutes to obtain the content of fluorine in the sample to be detected. The detection method can avoid inaccurate fluoride ion detection data caused by approximate appearance time and peak shape of hypophosphite ions and fluoride ions when ion chromatography is adopted todetect the ion content; therefore, the method is accurate in detection result and can be applied to detection of halogen content in wastewater.
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Description

technical field

[0001] The invention relates to the technical field of chemical analysis, in particular to a sample pretreatment method, a halogen content detection method and an application thereof. Background technique

[0002] Industrial wastewater usually contains both inorganic salts of halogen (free halogen) and organic compounds containing halogen (combined halogen). The parameter adjustment and wastewater discharge are particularly important. However, sample pretreatment is the key to the analysis of wastewater samples, which has a great influence on the accuracy of test results, and the recovery rate of halogens is low. Therefore, conventional inorganic acid digestion is not suitable for accurate quantitative analysis of halogens. The current pretreatment techniques for halogen samples mainly include pyrolysis, alkali fusion and oxygen bomb. The pyrolysis method causes the sample to undergo pyrolysis at high temperature to release halogen, which is tested by IC (i...

Claims

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