氧化体系中氰化物检测试验研究

Experimental Study on Cyanide Detection in Oxidation System

研究了氧化体系中氰化物的检测方法,绘制出氰化物标准曲线。考察氯胺T、亚硫酸钠加入量对氰化物检测结果的影响,并在最优条件下开展了加标回收率平行验证实验。结果表明:在20 mL的标准原液中,氯胺T最佳加入量为2 mL,还原剂亚硫酸钠最佳加入量为0.2 g,此时标准原液的氰化物检测结果为10.11 mg/L,偏差0.2%。当标液分别加入0.5~2.5 mL(标液氰化物浓度为50 mg/L)时,加标回收率为95.4%~104.6%,满足检测数据的准确性要求。本研究方法稳定性好,检测结果偏差小,可用于指导氧化体系中氰化物的样品检测。

Studied the detection method of cyanide in the oxidation system and plotted the cyanide standard curve.Study on the influence of the addition amount of chloramine T and sodium sulfite on the cyanide detection results,and conducted parallel validation experiments on spiked recovery rate under optimal conditions.The results showed that in a 20 mL standard stock solution,the optimal addition amount of chloramine T was 2 mL,and the optimal addition amount of reducing agent sodium sulfite was 0.2 g.At this time,the cyanide detection result of the standard stock solution was 10.11 mg/L,with a deviation of 0.2%.When 0.5~2.5 mL of standard solution was added(with a cyanide concentration of 50 mg/L),the recovery rate of the added standard solution was 95.4%~104.6%,meeting the accuracy requirements of the detection data.This research method has good stability and small deviation in detection results,and can be used to guide the detection of cyanide samples in oxidation systems.