ICP-AES法测定电镀厂周围土壤中Zn·Ni·Cr·Cu

[目的]建立一种土壤样品的测定方法。[方法]将电镀厂周围土壤样品,磨碎,过130目筛,取1.000 g土壤样品于聚四氟乙烯坩埚中,加入10 ml H2O2放置过夜,在微波炉中消解至近干;加15 ml浓HCl、5 ml浓HNO3消解至近干,再加5 ml HF,继续消解至粘稠状,用去离子水低温溶解残渣,转入25 ml容量瓶中,加5%HNO3定容,用ICP-AES法测定土壤中的Zn、Ni、Cr、Cu。[结果]在选定的测定条件下,检出限分别为0.005 2、0.013、0.006 9、0.009 6 mg/L;精密度的相对标准偏差分别为2.4%、2.9%、2.1%、3.4%;回收率在98.3%～103.7%。[结论]该测定方法灵敏、精密、准确度高;电镀厂周围土壤已经受到了影响,应严格加强管理。

Application of ICP-AES to Detecting Zn,Ni,Cr,Cu in Soil Sample from Peripheral of Electroplating Factor

[Objective]The aim of the study was to find a way to measure soil sample.[Method]The soil sample was obtained from peripheral of electroplating factor,milled and separated by screen grit 130.Take 1.000 g soil sample into teflon pot,put in 10 ml H2O2 for a whole night and clear them up to end in micro-wave stove.Then put in 15 ml strong HCl and strong 5 ml HNO3,and also clear them up to end in micro-wave stove.After that,put in another 5 mL HF and continue to clear them up till they become a kind of stick substance,use water dissolving leavings,transfer them into 25 ml content bottle,put in 5% HNO3 to fix them,and use ICP-AES to measure Zn,Ni,Cr,and Cu in soil sample.[Result]Under the determining situation,it could detect out 0.005 2,0.013,0.006 9 and 0.009 6 mg/L,the relative standard deviation of precision was 2.4%,2.9%,2.1% and 3.4% separately,the percent recovery of Zn was between 98.3% and 103.7%.[Conclusion]The above measure was sensitive,precise and exact.And the result indicates that the soil of peripheral of electroplating factor was polluted and should be under strict control.