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本文提出了3-甲基-1-苯基-5吡唑啉铜比色法,测定工业废水中氰化物的方法。本法相对变异系数58％;回收率96～104％;最低检出浓度0.005μg,同时克服了吡啶联苯胺比色法、异烟酸吡唑啉铜比色法、硝酸银容量法等方法的缺点。该法简便、准确、易行。校办工厂生产废水中氰化物常用的测定方法吡啶联苯胺比色法可谓五毒俱全,所用试剂氰化钾、溴、硫酸肼、吡啶、联苯胺均为有毒物质,尤其是吡啶具有刺鼻的恶臭气味,并且有致癌作用。异烟酸吡唑啉铜比色法受温度影响较大,操作不易控制,结果的精密度较差。硝酸银容量法只有在氰化物含量大于1mg/1时才能使用。鉴于上述情况,作者改用了3-甲基-1-苯基-5-吡唑啉铜比色法,克服了上述缺点,获得了满意结果。显色时使用吡啶量较之吡啶联苯胺比色法用量大大减少,基本上消
This paper presents a method for the determination of cyanide in industrial wastewater using 3-methyl-1-phenyl-5-pyrazoline copper colorimetric method. The relative coefficient of variation of this method is 58%; the recovery rate is 96-104%; the minimum detectable concentration is 0.005μg. At the same time, the methods of pyridine benzidine colorimetry, isonicotinic pyrazoline copper colorimetry and silver nitrate volumetric method Disadvantages. The method is simple, accurate and easy. School-run factory production of cyanide in wastewater determination method Pyridine benzidine colorimetry can be described as five to five percent, the reagents used potassium cyanide, bromine, hydrazine sulfate, pyridine, benzidine are toxic substances, especially with a pungent Stink odor, and has carcinogenic effects. Isonicotinic acid pyrazoline copper colorimetric method is greatly affected by temperature, the operation is not easy to control, the results of the poor precision. Silver nitrate volumetric method can only be used when the cyanide content is more than 1mg / 1. In view of the above situation, the author uses 3-methyl-1-phenyl-5-pyrazoline copper colorimetric method to overcome the above shortcomings and obtain satisfactory results. The amount of pyridine used in color development was significantly reduced compared with the pyridine benzidine colorimetric method