Method for detecting sulfide in sewage

Abstract

The invention provides a method for detecting sulfide in sewage. The method for detecting the sulfide in the sewage comprises the following steps that stabilizer and buffered solution are sequentially added in a water sample to be detected, pH of the water sample is adjusted to be 10.2-11.8, under magnetic stirring, a sulfide-ion-selective electrode and a reference electrode are adopted, standard zinc ion solution with 0.01mol / L concentration is used for titrating sulfide ions, a voltmeter is used for measuring electric potential change, positions before and after an equivalent point where abrupt changes occur in the electric potential are reaction endpoints, a second-order differential method is used for calculating the use level of the standard solution, and therefore sulfide ion content is calculated. According to the method for detecting the sulfide in the sewage, a sulfide-ion-selective electrode potentiometric titration mode is used for measuring the sulfide in the sewage, complex pretreatment for the water sample is unnecessary, and the measurement is not affected by ingredients, color and turbidity of the water sample, and the method for detecting the sulfide in the sewage is easy and convenient to operate, fast to analyze, accurate in results, good in effects of the adopted stabilizer, the buffered solution and titrating solution, and free of environmental damage.

Description

technical field [0001] The invention relates to a method for determining sulfide in sewage. Background technique [0002] Domestic sewage and industrial wastewater often contain sulfides. When a large amount of domestic sewage is discharged into the water system or sewer, the sulfur-containing organic matter is decomposed by microorganisms to produce sulfide. Sulfides can also be found in some industrial wastewater such as petroleum refining, man-made fibers, printing and dyeing, tanning, coking, gas making, mineral processing and papermaking. Under the action of anaerobic bacteria, sulfate can also be reduced to sulfide. The sulfide in water is easy to escape in the air, causing odor and high toxicity. It can interact with human cytochrome, oxidase and disulfide bonds in such substances, affecting the oxidation process of cells and causing hypoxia in cells and tissues. , endangering human life. Sulfide in water can release hydrogen sulfide, which can not only corrode me...

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Problems solved by technology

[0005] 1. The sulfide ion detection method involved in the "method for detecting sulfide ions" disclosed in the patent document with the patent application number 201010557792.4 needs to use a copper ion complex solution containing a macrocyclic compound, and its preparation process is complicated. The conditions are demanding and harmful to the environment;

[0006] 2. The sulfur ion detection method involved in the "indirect determination of sulfur ion content in oilfield sewage and sulfur valence state analysis method" disclosed in the patent document with the patent application number 200810111480.3 is an indirect determination with many steps and limited accuracy of results ;

[0007] 3. The sulfide ion detection method and device involved in the "Quick Determination Kit for Sulfide in Water" disclosed in the patent document with the patent application number 200820200353.6 is a one-time use product, and the measurement cost is high;

[0008] 4. The sulfide ion detection method and device involved in the "a device for measuring sulfide content in oilfield produced fluid" disclosed in the invention patent with the patent application number 201010039589.8 has a complex structure and is mainly used in oilfield produced fluid. limited use

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