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Method for detecting volatile organic compounds in water based on reverse osmosis

A technology of volatile organic compounds and reverse osmosis concentrated water, which is applied in the field of analysis and detection, can solve the problems of enrichment, difficult volatile organic compounds, and difficulty in reducing the detection limit of volatile organic compounds, so as to reduce losses and increase enrichment multiples. Effect

Inactive Publication Date: 2018-01-09
SHANDONG WATER & WASTEWATER MONITORING CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These pretreatment methods generally have no or low enrichment multiples, making it difficult to effectively enrich trace amounts of volatile organic compounds in water, and it is also difficult to reduce the detection limit of volatile organic compounds

Method used

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  • Method for detecting volatile organic compounds in water based on reverse osmosis
  • Method for detecting volatile organic compounds in water based on reverse osmosis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Experimental water quality: laboratory pipe network water samples, through the following steps to detect volatile organic compounds in laboratory pipe network water.

[0028] Take 20L of high-purity water, pump it into the water tank of the reverse osmosis device, turn on the water pump circulation, the circulation flow rate is 6LPM, and after 10 minutes of circulation, open the concentrated water valve to release the enriched concentrated water containing protective liquid and impurities. Repeat the cleaning 4 times until the reverse osmosis membrane is cleaned.

[0029] Take 100L of faucet water from the laboratory pipe network, pour it into the reverse osmosis water tank, and start the reverse osmosis cycle of the water sample, with a circulation rate of 8LPM. When about 3L of water sample remains in the reverse osmosis water tank, the circulation is stopped, the enriched concentrated water is discharged from the concentrated water valve, the measuring cylinder is qu...

Embodiment 2

[0039] Experimental water quality: laboratory pipe network water benzene spiked water sample, spiked concentration: 0.002mg / L, spiked water sample parallel measurement 3 times. The water sample reverse osmosis treatment and detection steps are as follows:

[0040] Take 20L of high-purity water, pump it into the water tank of the reverse osmosis device, turn on the water pump circulation, the circulation flow rate is 6LPM, and after 10 minutes of circulation, open the concentrated water valve to release the enriched concentrated water containing protective liquid and impurities. Repeat the cleaning 4 times until the reverse osmosis membrane is cleaned.

[0041] Take 100L of faucet water from the laboratory pipe network. After the water sample is spiked, put it into the reverse osmosis water tank, and start the reverse osmosis cycle of the water sample, and the cycle flow rate is 8LPM. When about 3L of water sample remains in the reverse osmosis water tank, the circulation is s...

Embodiment 3

[0053] The reverse osmosis-purge and trap of the present invention is compared with the traditional single purge and trap to treat carbon tetrachloride water samples. Experimental water quality: laboratory pipe network water carbon tetrachloride spiked water sample, spike concentration: 4× 10 -5 mg / L, the spiked water samples were measured in parallel three times.

[0054] (1) The water sample treatment and detection steps of the reverse osmosis-purge and trap scheme of the present invention are as follows:

[0055] Take 20L of high-purity water, pump it into the water tank of the reverse osmosis device, turn on the water pump circulation, the circulation flow rate is 6LPM, and after 10 minutes of circulation, open the concentrated water valve to release the enriched concentrated water containing protective liquid and impurities. Repeat the cleaning 4 times until the reverse osmosis membrane is cleaned.

[0056] Take 100L of faucet water from the laboratory pipe network. Aft...

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Abstract

The invention discloses a method for detecting volatile organic compounds in water based on reverse osmosis. The method comprises the following steps: concentrating and enriching a water sample by reverse osmosis treatment; collecting the volatile organic compounds from enriched concentrated water by adopting a pursing and trapping technique; detecting the volatile organic compounds by adopting gas chromatography-mass spectrometry; carrying out qualitative determination according to the retention time of the compounds and selected ions, carrying out quantitative determination according to thepeak area of the compounds, and obtaining the concentration of a to-be-determined substance in the sample by using a standard curve. According to the detection method disclosed by the invention, no organic solvent is needed, a concentration factor of the volatile organic compounds in the water can be effectively improved, the loss of the volatile organic compounds in the enrichment process is reduced, and a detection limit of the volatile organic compounds is reduced. According to the method, accuracy, precision, the detection limit and actual adding standard recovery of the water sample meetthe requirements of trace analysis.

Description

technical field [0001] The invention belongs to the field of analysis and detection, and relates to a detection technology for volatile organic compounds in water, which is mainly used for the detection of volatile organic compounds in water. Background technique [0002] Volatile organic compounds (VOCs) are a class of substances that have received high attention in the field of water environment and drinking water safety, including aromatic hydrocarbons, aliphatic hydrocarbons, halogenated hydrocarbons, etc., mainly from domestic sewage, agricultural sewage, solid waste, petrochemicals, etc. And water plant disinfection process, etc. Such substances have stable chemical properties, are not easy to decompose, and are highly carcinogenic, mutagenic, and toxic to the reproductive system. These compounds have low water solubility and are easy to enter the human body through drinking water, breathing, contact and other ways, posing a huge potential health threat to the human b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/08
Inventor 贾瑞宝孙韶华王永朝宋艳赵清华刘莉
Owner SHANDONG WATER & WASTEWATER MONITORING CENT
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