摘要
在磷酸缓冲介质中,水体中氰化物与氯胺T反应生成氯化氰,再与显色剂(异烟酸 吡唑啉酮)作用生成红色中间产物后进行比色测定。研究了氯胺T浓度、反应温度、显色时间的影响,找出最佳测定条件。方法的线性范围为0.006～1.0mg·L-1,检出限为0.006mg·L-1。该方法准确,快速,操作简便,能较好地应用于水质在线监测。
In a phosphate buffer of pH 7.0, cyanide is first reacted with chloramine T to form cyanogen chloride, which is further reacted with iso-nicrotinic acid and 3-methyl-1-phenyl-5-pyrazolone as color reagents. Not the final blue colored product, but the red intermediate product (λ_(max)=550nm) formed in 1min heated at 70℃, in a water bath, is used in the photometry. Various parameters including the concentration of chloramine T and time and temperature of the color reaction etc., are studied and optimized. Linearity is kept in the range of 0.006～1.0mg of cyanide per liter of solution. The detection limit is found to be 0.006mg·L^(-1). This method is rapid and simple and has been satisfactorily used in the on line monitoring of water quality.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2004年第6期341-342,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
快速测定
氰化物
氯胺T
异烟酸
吡唑啉酮
Rapid photometric determination
Cyanide
Chloramin T
Iso-nicotinic acid
3-Methyl-1-phenyl-5-pyrazolone
