Detection of surface water, groundwater, domestic drinking water

Water quality - Determination of cyanide - Volumetric and spectrophotometric methods - Warning: Cyanide and pyridine are highly toxic substances, and protective equipment should be worn according to regulations during operation to avoid contact with skin and clothing; The residual liquid after testing should be properly and safely treated. This standard specifies the analysis and determination methods for cyanide in surface water, domestic sewage, and industrial wastewater. This standard is applicable to the determination of cyanide in surface water, domestic sewage, and industrial wastewater. This standard is divided into two parts: the first part is the collection and preparation of samples. The second part is the analysis method of samples. The first part is the silver nitrate titration method. The second part is the isonicotinic acid pyrazolone spectrophotometric method. The third part is the isonicotinic acid barbituric acid spectrophotometric method. The fourth part is the pyridine barbituric acid spectrophotometric method. The detection limit of the silver nitrate titration method is 0.25mg/L, the lower limit is 0.25mg/L, and the upper limit is 100mg/L. The detection limit of isonicotinic acid pyrazolone spectrophotometry is 0.00Amg/L, the lower limit of determination is 0.016mg/L, and the upper limit of determination is 0.25mg/L. The detection limit of isonicotinic acid barbituric acid spectrophotometry is 0.001mg/L, the lower limit is 0.004mg/L, and the upper limit is 0.45mg/L. The detection limit of pyridine barbituric acid spectrophotometry is 0.002mg/L, the lower limit is 0.008mg/L, and the upper limit is 0.45mg/L

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