Detection method for rapidly and qualitatively testing cyanide content in wastewater treatment

Abstract

The invention discloses a detection method for rapidly and qualitatively testing the content of cyanide in wastewater treatment. A detection reagent is a mixed solution of orthotolidine and hydrochloric acid; the detection method comprises the following steps: firstly, injecting a certain amount of cyanide-containing wastewater into a test tube; then, dropping a plurality of drops of detection reagent into the test tube; finally, standing for 1-3 minutes, and observing the color in the test tube; the judging method comprises the following steps: if the color of a cyanide-containing wastewater test tube becomes yellow, indicating that the wastewater contains excessive residual chlorine, that is, the adding amount of sodium hypochlorite is enough to oxidize free and part of complex cyanide, and the cyanide-containing wastewater reaches the standard; if the color of the cyanide-containing wastewater test tube is not yellow, indicating that the adding amount of sodium hypochlorite is too small, and the cyanide-containing wastewater exceeds the standard. The detection method for rapidly and qualitatively testing the cyanide content in wastewater treatment is easy to operate, low in input cost and rapid in detection, whether the wastewater is qualified or not can be judged through direct observation, and convenience is provided for on-site detection.

Description

technical field [0001] The invention relates to the field of wastewater detection, in particular to a detection method for rapid qualitative testing of cyanide content in wastewater treatment. Background technique [0002] Industrial wastewater refers to the wastewater and waste liquid discharged during the production process, which contains industrial production materials, intermediate products, by-products and pollutants generated during the production process that are lost with water, and is an important source of environmental pollution, especially water pollution. reason. Common industrial wastewater includes cyanide-containing wastewater. [0003] Cyanide-containing wastewater, that is, wastewater containing cyanide. Cyanide is divided into two categories, one is inorganic cyanide, such as hydrocyanic acid and its salts; the other is organic cyanide or nitrile, such as acrylonitrile, acetonitrile and other cyanide ions are characterized by easy formation of complexes...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the detection method of current cyanide-containing wastewater mostly after sampling and detecting whether the wastewater exceeds the standard through cyanide detection equipment, not only the input cost of the detection equipment and the maintenance cost in the later stage are high, but also the detection cycle is longer. It is not as convenient as on-site detection and other shortcomings, but a rapid qualitative detection method for the detection of cyanide content in wastewater treatment is proposed

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