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An ovel method that combines inductively cou- pled plasma atomic emission spectrometry (ICP- AES) with a coprecipitation technique to determine trace and sub-trace elements in crude drugs is de- scribed herein. Yttrium phosphate quantitatively coprecipitated seven elements (Al, Cr, Fe, Zn, Cd, Pb and Bi) at pH 6 in a solution prepared from microwave-digested samples of crude drugs. Some matrix elements such as Na, K, Mg and Ca were effectively removed by this process. The thus co- precipitated elements were then determined by ICP- AES with yttrium as an internal standard element. The detection limits (3σ, n = 10) were 0.17mg/kg for Al, 0.004mg/k gf or Cr, 0.03mg/kg for Fe, 0.13mg/kg for Zn, 0.004mg/kg for Cd, 0.19mg/kg for Pb and 0.06mg/kg for Bi. The proposed method was success- fully utilized to determine the concentration of the above-mentioned seven elements in standard refer- ence materials (National Institute of Standards Tech- nology (NIST) SRM1515, SRM1547 and SRM1575a) and seven kinds of crude drugs.

journal of health science

Determination of Al, Cr, Fe, Zn, Cd, Pb and Bi in Crude Drugs by Inductively Coupled Plasma Atomic Emission Spectrometry after Coprecipitation with Yttrium Phosphate