摘要
采用HNO_3-HCl-HF-HClO_4和HNO_3-HCl-HF-H_2O_2 2种酸消解体系,微波消解和石墨消解两种方式对样品进行前处理,ICP-OES、ICP-MS和AAS三种测定方法对土壤和沉积物标准品中重金属进行测定,结果表明,HNO_3-HCl-HF-HClO_4体系可以使样品完全分解,所有样品中6种元素的测定值与标准值吻合良好,而HNO_3-HCl-HF-H_2O_2体系,微波消解不能用高氯酸,导致6个元素中Mn元素测定值与标准值相比严重偏低,其他元素测定值略微偏低,但在标准值偏差允许范围内。全自动石墨消解仪与微波消解仪相比自动化程度更高,准确度更高,ICP-OES、ICP-MS和AAS均可对土壤和沉积物进行准确测定,不同实验室可根据自身硬件条件选择不同的分析方法。
HNO3-HCl-HF-HClO4 and HNO3-HCl-HF-H2O2 were used to digest soil and sediment samples by microwave digestion and automatic graphite digestion equipment. ICP-OES,ICP-MS and AAS were developed for the determination of heavy metal elements in National Standard Materials. The results showed that HNO3-HCl-HF-HClO4 could decompose the sample completely, and the determined results of all the 6 target elements in all samples were in good agreement with the certified values, but HNO3-HCl-HF-H2O2 perchloric acid can not be used which lead to the low determined result and the determined results for other five elements were in the allowable range of deviation while slightly lower than the certified valus, automatic graphite digestion equipment is higher degree of automation and higher accuracy than microwave digestion equipment, ICP-OES,ICP-MS and AAS could all be applied to the accurate analysis of heavy metals in soil and sediment sample, different laboratories can select different analysis methods according to hardware condition by itself.
出处
《广东化工》
CAS
2017年第16期242-244,236,共4页
Guangdong Chemical Industry
