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水中氰化物的测定,常用的有比色法,即吡啶—盐酸联苯胺法,吡啶(异烟酸)—吡唑啉酮法,吡啶—巴比土酸法,以及气相色谱和离子选择性电极法。这些方法适用于低含量的测定,较高含量的污水需稀释后才能测定,往往引起较大的误差,而银量法滴定常只用于含量大于50μg/ml的水样。因此,对含氰在5—200μg/ml范围的污水,有必要采用更简便、合适的方法。
Determination of cyanide in water, commonly used colorimetric methods, namely pyridine - benzidine hydrochloride method, pyridine (isonicotinic acid) - pyrazolone method, pyridine - barbituric acid method, and gas chromatography and ion selective electrode law. These methods are suitable for low-level assays. Higher levels of sewage can only be diluted to determine, often resulting in large errors. Silver-based titrations are often used for water samples containing more than 50 μg / ml. Therefore, the cyanide in the range of 5-200μg / ml of sewage, it is necessary to adopt a more convenient and suitable method.