Abstract： This paper discussed the effect of different dissolving instruments ， dissolving system ，
dissolving temperature and acid adding method on soil sample deterring results ， as well as the methods
of masking the interference elements. The decomposition method of HCl ￣ HNO 3 ￣ HF ￣ HClO 4 was
achieved with the company of electrothermal plate ， which was used to dissociate and control the
temperature at 140 ℃ while the soil samples were dissolved. In order to avoid HCl and HClO 4
residual ， the HCl was added in the first place ， followed by HClO 4 · NH 4 Cl was used to avoid the
interference of Fe ， Al ， Ca ， Mg and other coexistence ion and accelerate the pretreatment process. By
using this method ， Cu ， Zn ， Cr ， Pb ， Cd and Ni could also be analyzed in sequence in a single
dissolution ， which significantly improved the working efficiency and saved the cost of analysis. In
addition ， the conditions of the instrument also have a great impact on the sensitivity of the result ，
which could be improved by selecting the proper wavelength according to the range of the sample ， the
width of slit and the type of flame. By analyzing national standards material GBW07401 ， the standard
deviation of Cu ， Zn ， Cr ， Pb ， Cd and Ni was found to be 3.39% ， 1.52% ， 1.77% ， 2.26% ， 4.08% ，
1.00% respectively and the detection limits to be 3 μg · g -1 ， 3 μg · g -1 ， 5 μg · g -1 ， 2 μg · g -1 ， 0.1 μg · g -1 ，0.5 μg · g -1 correspondently.
刘香英，袁 建，崔建勇，李振涛，刘高辉，张静波. 改进的原子吸收法测定土壤样品中的6种重金属元素[J]. 世界核地质科学, 2019, 36(02): 109-115.
LIU Xiangying,YUAN Jian,CUI Jianyong,LI Zhentao,LIU Gaohui,ZHANG Jingbo. Determination of six heavy metal elements in soil samples by improved
Atomic Absorption Spectrometry. , 2019, 36(02): 109-115.
2019, Vol. 36 
