FAAS Determination of Heavy Metal Elements in Fly-Coal Ash with Microwave Assisted Sample Digstion

Microamounts of Pb,Cr,Ni,Cu,Zn and Mn in fly-coal ash were determined by FAAS.The sample was digested with a mixture of HNO3 and HF (8+1).Boric acid was added to dissolve insoluble fluorides of Al,Ca and Mg.Standard curves of the 6 elements were prepared by using the respective standard solutions,and linear regression equations with correlation coefficients from 0.999 1 to 1.000 0 were obtained.Test for recovery was made by standard addition method,and values of recovery found were in the range of 94.9%-102.4%.