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Standard
| GB/T 7487-1987 Water quality; Determination of cyanide; Part 2:Determination of cyanide (English Version) |
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Detail of GB/T 7487-1987
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Introduction of GB/T 7487-1987
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GB 7486-87 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GB 7486-87 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GB 7486-87 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）。
Contents of GB/T 7487-1987