【作者】 苟勇；

【导师】 肖卫；

【作者基本信息】 苏州大学 ， 劳动卫生与环境卫生学， 2009， 硕士

【摘要】 目的:建立一种快速消解并同时测定工作场所空气中痕量重金属钴(Co)﹑铜(Cu)﹑铅(Pb)﹑镍(Ni)、镉(Cd)﹑锌(Zn)的方法。方法:采用微波消解法,在180℃﹑20atm﹑800w条件下消解采样滤膜;用壳聚糖在消解溶液pH=5.0,室温(20~30℃)条件下富集,直接火焰原子法测定富集消解液中痕量重金属Co﹑Cu﹑Pb﹑Ni、Cd﹑Zn。结果:微波消解法与混酸消解法相对标准偏差(RSD)范围分别为3.0%~12.7%和6.7%~22%,微波消解法RSD明显低于混酸消解法,说明微波消解法精密度好于混酸法;Co﹑Cu﹑Pb﹑Ni、Cd﹑Zn检出限分别为4.85、2.42、3.17、5.47、0.42、0.51ng/ml;标准曲线回归系数(r)范围为0.999 1~0.999 9;回收率范围为91.3%~108.4%;用标准物质(GBW08401)进行质控测试,分析结果与标准值吻合;样品测定值与石墨炉原子法相比,无显著性差异(P﹥0.05)。结论:该方法简便、快速、准确、灵敏度高,适合工作场所空气中痕量重金属Co﹑Cu﹑Pb﹑Ni、Cd﹑Zn的测定。更多还原

【Abstract】 Objective:To find a method of digesting membranes rapidly and simultaneously determining trace heavy metals of Pb, Cd, Cu, Co, Ni and Zn in the air of workplaces.Methods: In the paper, trace heavy metals of Pb, Cd, Cu, Co, Ni and Zn in the the air of workplaces were pretreated by microwave digestion (at 180℃, 20atm , 800w) and concentrated by absorption on chitosan (at pH = 5.0, 20℃~30℃),Determined Co, Cu, Pb , Ni, Cd and Zn in digesting liquids with direct flame atomic absorption spectrophotometry.Results: Microwave digestion relative standard deviation (RSD) range of 3.0% ~12.7% was significantly higher than mixed acid method of 6.7%~22%, indicated good precision compared with the mixed acid method; The detection limit of this method was 3.17ng/ml for Pb, 0.42 ng/ml for Cd , 2.42 ng/ml for Cu, 4.85 ng/ml for Co, 5.47ng/ml for Ni and 0.51ng/ml for Zn;Standard linear correlation (r) were of the range 0.9991~0.9999; Recovery ratio were of the range 91.3%~108.4%; The standard reference materials was used as quality control standards and the analysis results conformed well to the certified values, the sample results have no significance different(P﹥0.05)compared with graphite furnace atomic absorption spectyometry.Conclusion: The method was simple, rapid , accurate and highly sensitive. It was suitable for determining trace heavy metals of Pb, Cd, Cu, Co, Ni and Zn in the air of workplaces.更多还原