Simultaneous determination of multiple elements of tea garden soil using inductively coupled plasma mass spectrometry

Established a method of simultaneous determination of multiple elements of tea garden soil, the inductively coupled plasma mass spectrometry (ICP-MS) was used to test. The soil samples were decomposed by the fully automatic microwave with hydrogen nitrate (HNO3) and hydrofluoric acid (HF). The kinetic energy discrimination (KED) mode, the correction equation and the internal standard method were adopted to eliminate matrix effect interference within the testing process by ICP-MS. Moreover, contents of twenty-six soil elements were calculated with the corresponding standard curve at different content levels of standard solution. The results indicated that the curves of twenty-six elements which the contents were in the range of 0~200μg/L were all approximately linear with correlation coefficients (R 2)> 0.990. The ranges of the limits of detection (LOD), the limits of quantification (LOQ) and the average recoveries (AR) of twenty-six soil elements were 0.0038~3.6198μg/L, 0.0127~12.0660μg/L and 84.04 %~121 %, respectively, and the relative standard deviations (RSDs) were less than 7 %. The RSDs of standard substances of soil composition analysis were all < 5 % with ICP-MS in our experiments.