Simultaneous Determination of 7 Componental Elements in Zinc Plate and Zinc Alloy by ICP-AES with Matrix-matching

ICP-AES was applied to the determination of Al,Cd,Cu,Fe,Mg,Pb and Sn in zinc plate and zinc alloy. Interference of zinc was eliminated by the matrix-matching method. One gram of the sample was dissolved in nitric acid and the solution was made up to 100 mL in a volumetric flask and was ready for AES determination. Detection limits of the 7 elements were found in the range of 0.000 9-0.022 5 mg·L-1. Precision and recovery of the method were tested,giving RSD′s in the range of 0.048%-0.34% and recoveries in the range of 99.0%-102.0%.