Standard No.:	GB 7486-1987
English Name:	Water quality; Determination of cyanide; Part 1:Determination of total cyanide
Chinese Name:	水质 氰化物的测定 第一部分:总氰化物的测定
Chinese Classification:	Z16    Analysis methods for toxic substances in water
Professional Classification:	GB    National Standard
Source Content Issued by:	State Environmental Protection Administration
Issued on:	1987-03-06
Implemented on:	1987-8-1
Status:	superseded
Superseded by:	HJ 484-2009 Water quality-Determination of Cyanide Volumetric and Spectrophotometry method
Superseded on:	2009-11-1
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	120.0
Delivery:	via email in 1~3 business day

本标准适用于饮用水、地面水、生活污水和工业废水。活性氯等氧化物干扰，使结果偏低，可在蒸馏前加亚硫酸钠溶液排除干扰，见6.1.7a。硫化物干扰，可在蒸馏前加碳酸铅或碳酸镉排除干扰，见6.1.7c。亚硝酸离子干扰，可在蒸馏前加适量氨基磺酸排除干扰，见6.1.7b。少量油类对测定无影响，中性油或酸性油大于40mg/L时干扰测定，可加入水样体积的20%量的正已烷，在中性条件下短时间萃取排除干扰。本标准分四篇：第一篇 氰化氢的释放和吸收；第二篇 硝酸银滴定法；第三篇 异烟酸-吡唑啉酮比色法；第四篇 吡定-巴比妥酸比色法。硝酸银滴定法最低检测浓度为0.25mg/L；检测上限为100mg/L。异烟酸-吡唑啉酮比色法最低检测浓度为0.004mg/L；检测上限为0.25mg/L。吡啶-巴比妥酸比色法最低检测浓度为0.002mg/L（用72型分光光度计，吸光度为0.020左右）；检测上限为0.45mg/L(10mm比色皿)、0.15mg/L（30mm比色皿）。