Simultaneous determination of macro and trace elements in biological reference materials by microwave induced plasma optical emission spectrometry with slurry sample introduction

摘要

A slurry sampling technique (SST) has been utilized for simultaneous multi-element analysis by microwave-induced plasma optical emission spectrometry (MIP-OES).Slurry samples from a spray chamber are fed directly into the microwave cavity-torch assembly (power 300 W) with no desolvation apparatus.The performance of SST-MIP-OES was demonstrated by the determination of macro (Na,K,Ca,Mg,P) and trace (Cd,Cu,Mn,Sr,Zn) elements in three biological certified reference materials using a V-groove,clog-free Babington-type nebulizer.Slurry concentrations up to 1% m/v (particles <20mum),prepared in 10% HNO_3 (pH 1.2) containing 0.01% of Triton X-100,were used with calibration by the standard additions method.The method offers relatively good precision (R.S.D.ranged from 7 to 11%) with measured concentrations being in satisfactory agreement with certified values for NRCC TORT-1 (Lobster hepatopancreas),NRCC LUTS-1 (Lobster hepatopancreas) and IAEA-153 (Milk powder).The concentrations of Na,K,Ca,Mg,P and Cd,Cu,Mn,Sr,Zn were determined in the range 90-22 000mug/g and 1-420mug/g,respectively.The method could be useful as a routine procedure.