Direct solid sampling electrothermal atomic absorption spectrometric determination of toxic and potentially toxic elements in certified reference materials of brown coal fly ash

摘要: Abstract This work describes a method for the direct determination of Bi, Cd, Cr, Ni, Pb, Sb, Sn and Zn in reference materials brown coal fly ash, using solid sampling electrothermal atomic absorption spectrometry. The use chemical modifiers was found to be necessary obtaining reproducible sufficiently sensitive signals analytes under study. mixture Pd Mg(NO 3 ) 2 used Zn, W (permanent modifier) combination with (as aqueous provided well-defined signal profiles Cr Ni ash samples. A systematic study focused on alternative (less sensitive) lines sufficient sensitivity. following analytical were used: Bi 306.8 nm, Cd 326.1 nm, 520.6 nm, 305.1 nm, Pb 205.3 nm, Sb 206.8 nm, 300.9 nm, 307.6 nm. limits detection 0.057 μg g − 1 0.21 μg 1.1 μg 1.4 μg 4.0 μg 0.13 μg 0.33 μg 16 μg respectively.