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Method for detecting content of sulfite in water by gas-phase molecular absorption spectrum

A sulfite, gas-phase molecule technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of secondary environmental pollution and mercury pollution, and achieve the effects of fast analysis speed, simple operation and shortened analysis period.

Inactive Publication Date: 2009-06-10
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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Problems solved by technology

Potassium tetrachloride, a highly toxic reagent, will be used in the determination, which will cause mercury pollution and cause secondary pollution to the environment.

Method used

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  • Method for detecting content of sulfite in water by gas-phase molecular absorption spectrum
  • Method for detecting content of sulfite in water by gas-phase molecular absorption spectrum
  • Method for detecting content of sulfite in water by gas-phase molecular absorption spectrum

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Embodiment Construction

[0011] Choose different substrates of wastewater, including natural river water, steel pipe oil, pump station water and steel plant continuous casting wastewater, take 5ml water samples, acidify them with 2mol / L sulfuric acid solution, and convert sulfite into sulfur dioxide:

[0012] SO 3 - +2H + SO 2 +H 2 O, carrier gas flow rate 800ml / min, reaction time 15s,

[0013] Then, using a zinc hollow cathode lamp as the excitation light source, the molecular absorption intensity of sulfur dioxide at a wavelength of 202.6 nm was measured. The results are shown in the following table. Take another 5ml water sample, and add 1ml10mg / L sodium sulfite standard solution to Maluhe and continuous casting water samples, steel pipe containing oil, add 0.5ml10mg / L sodium sulfite standard solution to the water sample of 1# pump station, and the result of standard addition recovery See Table 1:

[0014]

[0015]

[0016] Table 1 Using the method of the present invention to add standard to dete...

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Abstract

The invention relates to a method for quantitative determination of sulphite, particularly to a method of measuring content of sulphite in water. A method of measuring content of sulphite in water through gas phase molecular absorption spectrometry, including a gas phase molecular absorption spectrometer, comprises the following steps: step 1 of converting sulphite into gaseous sulfur dioxide; step 2 of using zinc hollow cathode lamp as excitation source, measuring molecular absorption intensity of sulfur dioxide at wavelength 202.6 nm, thereby performing quantitative analysis on sulphite. The inventive method of using measuring content of sulphite in water through gas phase molecular absorption spectrometry has convenient operation, fast analysis speed and small environmental pollution.

Description

Technical field [0001] The invention relates to a method for determining the content of sulfite, in particular to a method for determining the content of sulfite in water. Background technique [0002] With the rapid development of modern industry, acid rain caused by sulfur dioxide pollution has become more and more harmful to the environment. After sulfur dioxide enters the water body, it will exist in the water as a dynamic balance of sulfite and bisulfite, which is harmful to fish and fish in the water. Aquatic organisms have certain toxic effects, and their reducing properties can quickly consume dissolved oxygen in water and deteriorate water quality. At present, the analysis of sulfites has not been carried out much. Common analysis methods include spectrophotometry, chromatography, electrochemical methods, etc., but these methods generally have disadvantages such as low sensitivity and large interference. The most widely used spectrophotometric method to determine the sul...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 汪慧萍陈慧
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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