Determination of 15 Metal Elements in Environmental Soil by Inductively Coupled Plasma Atomic Emission Spectrometry with Classification Digestion

Six elements of Be, Zn, Mo, Tl, Ti and Sb in soil were digested with mixed acid of HNO₃-HF-HClO₄ as digestion system by automatic digestion, and nine elements of V, Mn, Co, Ni, Cu, Cd, Ba, Pb and Cr in soil were digested with mixed acid of HNO₃-HF-HCl as digestion system by microwave digestion. Argon was used as internal standard to correct atomization efficiency and ionization efficiency of soil matrix. The multi-directional observation mode was adopted in inductively coupled plasma atomic emission spectrometry (ICP-AES) and the multi spectral line fitting technique (MSF) was used to correct the spectrum interference. Above 15 elements in environmental soil were determined by ICP-AES, and the detection limits were found in the range of 0.1-3.7 mg·kg^-1. The standard samples GSS-10 and GSS-13 were determined by the above method, giving results in consistency with certified values, with RSDs (n=11) in the range of 0.15%-2.6%. Taking a riparian soil in Jilin as an actual sample, the values of all elements determined by ICP-AES were consistent with the results of inductively coupled plasma mass spectrometry (ICP-MS), with RSDs (n=11) in the range of 1.6%-4.5%.