Determination of 16 heavy metal elements and 16 rare earth elements in Ya'an tibet tea by ICP-MS

Abstract

The contents of 16 heavy metal elements such as As,Be,Co,Cr,Cu,Ga,Li,Ni, Sr,V,Zn,Ag,Cd,Cs,Bi, Pb and 16 rare earth elements such as Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm,Yb, Lu were analyzed, simultaneously and effectively by inductively coupled plasma-mass spectrometry (ICP-MS) method with high pressure digestion and Rh, Re as the internal standard elements. The linear correlation coefficient of each element standard curve was 0.9919- 0.9999; the detection limit of each element is 0.0003 ug/L -0.2164 ug/L; the daily and daytime deviation of each element was lower; the average recoveries were between 93.39% -110.99%, RSD was less than 7.49%. The results showed that the average content of Zn was the highest to be (32.833±0.993) mg/kg, followed by Cu, Sr and Ni, which were significantly higher than those of other 28 elements. The total amount of rare earth in Ya'an was 0.588 mg/kg -3.161 mg/kg, The average content of Ce was the highest, followed by La, Sc, Nd and Y, the total amount of rare earth total 83.16%-86.15%, the average content of Lu was the lowest. The proportion of each element in the soil, different tea varieties on the absorption and enrichment of various elements, application of fertilizer and pesticide in tea garden resulted in the great differences of each element content.