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Detection method for iodine acetonitrile in water

A technology of iodoacetonitrile and detection method, which is applied in the field of environmental detection, can solve problems such as low recovery rate, and achieve the effect of improving recovery rate and enrichment multiple

Inactive Publication Date: 2016-10-05
GUANGXI UNIV FOR NATITIES
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  • Abstract
  • Description
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Problems solved by technology

[0004] At present, there is no report about the determination method of iodoacetonitrile at home and abroad. The determination of iodoacetonitrile mainly refers to the determination method of other halogenated halogenated acetonitrile compounds. Generally, direct liquid-liquid extraction (LLE) method is used to enrich water samples. However, ICAN in drinking water is at the μg / L level. Compared with carbon-containing disinfection by-products when analyzing its concentration, the recovery rate is often low due to the small amount of enriched water samples and the instability of ICAN itself. In addition, Which extraction agent is the best for extracting ICAN, how does different extraction time and the presence of different disinfectant terminators affect the stability of ICAN, no similar reports have been seen before

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  • Detection method for iodine acetonitrile in water
  • Detection method for iodine acetonitrile in water
  • Detection method for iodine acetonitrile in water

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The detection method of iodoacetonitrile in water comprises the steps:

[0028] (1) Terminate the disinfection reaction: Add 100 μg / L iodide ions to the distribution water containing a certain amount of NOM (Natural organic matter, Natural organic matter), where the DOC of the water sample is 5.0 mg / L, and under the condition of pH 7.0, use chloramine After disinfection for 1 day, accurately pipette 100ml of the sterilized drinking water sample, add 1ml of 10mmol / L sodium sulfite to remove the influence of oxidants in the drinking water sample, and test the water sample immediately after the reaction is terminated;

[0029] (2) For the enrichment of iodoacetonitrile, add 20g of anhydrous sodium sulfate to the water sample to adjust the pH to 4.0-5.0, then add 4mL methyl tert-butyl ether (MTBE) to extract the iodoacetonitrile in the water sample For enrichment, shake and stir for extraction for 5 minutes, let stand for 10 minutes, take the upper organic extraction solven...

Embodiment 2

[0037] The detection method of iodoacetonitrile in the actual water sample disinfection process comprises the steps:

[0038] (1) The water sample to be measured of the present invention is a certain surface water, and the dissolved organic carbon (DOC) of the water sample is measured after the water sample to be measured is passed through a 0.45 μm filter membrane, and the numerical value obtained is calculated by 3 times of DOC. dosage. Wherein the DOC of the surface water is 2.5 mg / L, and the dosage of chloramine is specifically 5.0 mg / L.

[0039] Terminate the disinfection reaction: add 200 μg / L iodide ions to the filtered water (the iodine ion content in the water itself is very low, we artificially add iodide ions for the purpose of the test), and after chloramine disinfection for 1 day, accurately pipette 100 mL of the sterilized water sample , Add 1ml of 10mmol / L sodium sulfite to remove the influence of the disinfectant in the water sample, and test the water sample ...

Embodiment 3

[0043] The tap water selected in the embodiment of the present invention is an object, and the dissolved organic carbon (DOC) of the water sample is measured after the water sample to be tested is passed through a 0.45 μm filter membrane. The detection method of iodoacetonitrile in the actual water sample disinfection process comprises the following steps:

[0044] (1) Terminate the disinfection reaction: add 100 μg / L iodide ion to the water sample, and after chloramine disinfection for 2 hours, accurately pipette 100 mL of the sterilized water sample, and add 1 ml of 10 mmol / L sodium sulfite to remove the disinfectant in the water sample The influence of the water sample is detected immediately after the reaction is terminated;

[0045] (2) For the enrichment of iodoacetonitrile, adjust the pH to 4.0-5.0 in the detection water sample, add 20g of anhydrous sodium sulfate, and then add 4mL MTBE to extract and enrich the iodoacetonitrile in the detection water sample, shake and s...

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Abstract

The invention discloses a detection method of iodoacetonitrile in water, comprising the following steps: (1) terminating the disinfection reaction, taking a certain amount of sterilized water sample, adding a terminator to obtain the detection water sample; (2) enriching the iodoacetonitrile , adjust the pH range of the water sample to be tested to 4.5-5.5, then add the extractant to the extraction and enrichment of the iodoacetonitrile in the water sample, let it stand, get the upper organic extraction solvent, for subsequent use; (3) use the pre-established standard The curve is used as a reference standard, and the organic extraction solvent is detected by GC / MS to obtain a chromatogram, and the content of the iodoacetonitrile can be known by calculating the response peak area. The detection method of the invention is simple and easy to implement, can effectively detect the content of monoiodoacetonitrile in the drinking water after disinfection, and provides theoretical guidance for the safety of drinking water.

Description

technical field [0001] The invention belongs to the field of environmental detection, and in particular relates to a detection and analysis method of iodoacetonitrile, a disinfection by-product in water. Background technique [0002] Iodinated disinfection by-products (Iodo-DBPs) are newly discovered uncontrolled disinfection by-products in the drinking water disinfection process, and their formation depends on the iodide ion level in the raw water and the disinfectant. The concentration of iodide ions in natural water bodies is not high, and high concentrations of iodide ions often come from industrial pollution and seawater invasion. At present, there are mainly four kinds of disinfectants commonly used in drinking water, free chlorine disinfection, chloramine disinfection, ozone disinfection and chlorine dioxide disinfection. Among them, chloramine disinfection is easy to form Iodo-DBPs. The content of Iodo-DBPs in factory water is at the level of ng / L~μg / L, but its tox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/08
CPCG01N30/08G01N2030/062
Inventor 刘绍刚李振林张海清刁开盛谭学才黄婉婷赵芳马亚红张文珍覃太生雷福厚
Owner GUANGXI UNIV FOR NATITIES
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