Apparatus and method for simultaneously detecting molecular weight distribution of water sample and organic nitrogen

A technology of molecular weight distribution and simultaneous detection, applied in the field of environmental detection

Inactive Publication Date: 2018-11-30
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention is committed to solving the above-mentioned deficiencies in the detection of the water quality of polluted water bodies that current

Method used

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  • Apparatus and method for simultaneously detecting molecular weight distribution of water sample and organic nitrogen
  • Apparatus and method for simultaneously detecting molecular weight distribution of water sample and organic nitrogen
  • Apparatus and method for simultaneously detecting molecular weight distribution of water sample and organic nitrogen

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Experimental program
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Embodiment

[0096] Preparation:

[0097] The instrument is turned on and the computer 28 is turned on. The mobile phase was ultrasonically degassed for 20 min to eliminate air bubbles in the mobile phase so as not to interfere with the detection results. Pass the sample through a 0.45 μm membrane to remove particulate impurities that could cause clogging of the instrument. Set the temperature of the column oven. In the UV digester 16, the wavelength of the UV lamp is set to 190nm, and the heating temperature is set to 95°C. The UV detector 26 is turned on and the detection wavelength is set to 540 nm. Turn on the ultrapure water pump 36 to allow CO 2 Ultrapure water starts flowing in the detector. Empty the waste container 27.

[0098] Steps:

[0099] After the preparations are finished, turn on the mobile phase infusion pump 2, and set the flow rate and pressure. After the baseline of the computer 28 is stable (generally 1 to 2 hours), set the sampling volume of the sampling pump...

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Abstract

The invention relates to an apparatus and a method for synchronously detecting molecular weight distribution of a water sample and organic nitrogen. The apparatus comprises an end injection valve, a chromatography column, a pressure reducing valve, an acid injection valve, an oxygen injection valve, an acid-oxygen reaction spiral tube, a CO2 remover, an UV digestion device, a second gas-water separation membrane, a buffer solution injection valve, a buffer solution reaction spiral tube, a cadmium column, a developer injection valve, a color reagent reaction spiral tube and an UV detector whichare sequentially connected through a pipeline, the end injection valve is used for receiving a mobile phase and the sample, and the second gas-water separation membrane is connected to a CO 2 conductivity detector, and the UV detector and the CO 2 conductivity detector are both connected to a computer for data processing. The apparatus realizes the synchronous detection of TOC concentration and DON concentration of the sample to be tested in different molecular weight distribution intervals, and provides a reliable and convenient detection means used in the water quality detection fields suchas water quality analysis of inlet water and outlet water and detection and control of nitrogen-containing disinfection by-products in water plants.

Description

technical field [0001] The invention relates to the technical field of environmental detection, in particular to an instrument and method for synchronously detecting the molecular weight distribution and organic nitrogen of water samples. Background technique [0002] At present, due to its vast land area, my country's total fresh water resources are relatively high, ranking fourth in the world, accounting for 6% of the world's total water resources. However, due to its large population, the per capita share of fresh water resources only ranks 121st in the world. From this point of view, China is still a country with serious water shortage. Although the per capita share of fresh water resources is seriously insufficient, various water pollution situations still occur many times across the country, such as the abuse of organic pesticides, personal care products, phosphorus-containing washing powder, etc., untreated industrial wastewater is discharged indiscriminately, agricul...

Claims

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Application Information

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IPC IPC(8): G01N30/88
CPCG01N30/88G01N21/78G01N33/182G01N33/1846G01N2030/067G01N30/14G01N30/64G01N2030/645G01N2030/884
Inventor 张文俊黎雷
Owner TONGJI UNIV
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