Method for detecting sulfide in water

Abstract

The invention relates to the technical field of water quality detection, in particular to a method for detecting sulfide in water, the method for detecting the sulfide in the water comprises water sampling, pretreatment and detection analysis, and a photometer adopted in pretreatment comprises a shell, a sampling cavity, a light source and a controller; a partition plate is arranged in the middleof the sampling cavity, and inserting cylinders are arranged on the two sides of the partition plate respectively; due to the fact that the stability characteristic of the sulfide in a water sample ischanged due to temperature changes in the detection process of the water sample, the accuracy of photometric measuring is affected, the detection time of the water sample is prolonged due to the stepof conducting heat preservation detection on the water sample, and the detection accuracy of the sulfide is reduced as well. Therefore, a sampling cavity made of transparent glass arranged in a photometer is used, the water bath heat preservation effect in the sampling cavity is matched, spectrophotometric detection is carried out on the water sample in the inserting cylinders, it is guaranteed that sulfide components in the water sample are in a stable state, and therefore the detection accuracy of the sulfide in the water is improved.

Description

technical field [0001] The invention relates to the technical field of water quality detection, in particular to a method for detecting sulfide in water. Background technique [0002] Sulfide in water is mainly produced by the reduction of sulfate by bacteria under anaerobic conditions, and some are produced by the decomposition of sulfur-containing organic matter; sulfide is mainly soluble hydrogen sulfide, sulfur ion, hydrogen sulfide Root ions exist in water bodies, and soluble metal sulfides, soluble sulfides, and unionized organic and inorganic sulfides in suspended matter are also the main forms of sulfides in water; as an important indicator for judging the degree of water pollution, The higher the value of sulfide, the more serious the pollution of the water body; for the introduction of the detection method of sulfide in water, please refer to: Wang Xinyu et al., Comparison of on-site detection method and laboratory method of sulfide in drinking water[J], Environmen...

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Problems solved by technology

[0004] In the prior art, there are also some technical solutions about the detection method of sulfide in water. For example, a Chinese patent with application number 2012104081193 discloses a method for preparing and using a color-developing detection sheet for determining sulfide in water. Mix sulfuric acid, anhydrous sodium sulfate and ferric ammonium sulfate, and press to obtain tablet I; then mix melted polyethylene glycol 4000 and N,N-dimethyl-p-phenylenediamine hydrochloride, cool and grind into powder Mix with anhydrous sodium sulfate, and press to obtain Tablet II; after sticking a small amount of melted polyethylene glycol 4000 on the surface of Tablet II, it is quickly bonded with Tablet I to form a color-developing test piece for determining sulfide in water, which can be directly Use or seal and store away from light; when in use, immerse the chromogenic test piece in 10 ml of water to be tested, shake gently for 10 minutes to dissolve the test piece, and measure it with a portable spectrophotometer; the chromogenic test piece in this technical solution It is easy to carry, easy to store, and does not need any additional reagents when used. The result is accurate and reliable, and is suitable for the on-site quantitative detection of sulfide in surface water, domestic sewage, industrial wastewater and other water bodies; The detection of sulfide is in a constant temperature range, which makes the stability of sulfide in the detection process insufficient, reducing the accuracy of sulfide detection data in water

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