ICP-AES Determination of 12 Heavy Metal Elements in Yixing Teapots

ICP-AES was applied to the determination of 12 heavy metal elements,i.e.As,Ba,Bi,Cd,Cr,Fe,Hg,Mn,Ni,Pb,Sb and Sn in Yixing teapots.The sample of Yixing teapot was immersed in hydrochloric acid (10+90) solution for 4 h.The following parameters were used: high-frequency power: 1 150 W;auxiliary gas flow rate: 0.5 L·min-1;carrier gas flow rate: 0.5-0.6 L·min-1 and the observation height: 9 mm.Linear relationships between values of emission intensity and mass concentration of the 12 heavy metal elements were kept in the range within 5.00 mg·L-1,with detection limits (3s/k) in the range of 0.002-0.010 mg·L-1.Values of recovery found by standard addition method were in the range of 93.0%-105%,and values of RSD′s (n=21) in the range of 0.24%-0.83%.