作者：刀谞, 张霖琳, 滕恩江, 吕怡兵, 薛荔栋, 高愈霄
作者单位：中国环境监测总站, 北京 100012
关键词：水环境;阳极溶出伏安法;镉;应急监测
摘要：
建立一种快速测定水体中镉、铅、汞、砷的阳极溶出伏安法。对现场快速测定影响因素进行探讨,并主要对镉的检出限、精密度和准确度进行研究,将该方法运用到广西龙江镉污染事故应急监测中,并与多种其他方法进行比对。结果表明:该方法运用最优温度为5～40 ℃,水样最佳ph范围为4～9。便携式阳极溶出伏安法测定污染水样中的镉,检出限为0.1 g/l,加标回收率在80%～110%间;在实际样品质量浓度在2～110 g/l范围内准确度均满足要求,实际样品测定精密度2%～5%;与在线监测结果的相对偏差4%,与石墨炉原子吸收测定结果相对偏差1%。该方法稳定、快速,灵敏度高,准确度好,可广泛用于重金属污染事故应急监测。
study and application in determination of cadmium by portable anodic stripping voltammetry
dao xu, zhang linlin, teng enjiang, l?譈 yibing, xue lidong, gao yuxiao
china national environmental monitoring centre, beijing 100012, china
abstract: a portable anodic stripping voltammetry method was established for heavy metal determining. after studying the factor which influence rapid determination including detection limit, precision and accuracy, the method was applied to longjiang river cadmium pollution emergency monitoring and compared with other methods. the results show that the optimal temperature for portable anodic stripping voltammetry determination of cadmium in contaminated water samples is 5 ℃ to 40 ℃, the detection limit is 0.1 μg/l, the recovery rate is 80%～110% in the actual sample, concentration of 2 μg/l to 110 μg/l within the accuracy requirements, the actual precision of sample determination is from 2% to 5%, and online monitoring vehicle determined the outcome of the relative deviation is less than 4%; and the relative standard deviation compared with graphite furnace is less than 1%. this method was stable, rapid, sensitive and reliable, which is suitable for heavy metal pollution emergency monitoring.
keywords: aqueous environment;anodic stripping voltammetry;cadmium;emergency monitoring
2015, 41(2): 34-37,41 收稿日期: 2014-5-17;收到修改稿日期: 2014-7-19
基金项目: 国家863计划(2013aa06a308)
作者简介: 刀 谞(1984-),女,云南普洱市人,工程师,硕士,主要从事环境监测工作。
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