Abstract：The interaction and mutual influence among several operating parameters of flame atomic absorption spectrometer were investigated through response surface method, and the working conditions for determination of Cd and Cr in lead zinc ore tailings slag were optimized. By Box-Behnken Design, the extent of influence for four factors including lamp current, spectral band width, acetylene flow rate and burner height on the absorbance of Cd and Cr in lead zinc ore tailings slag was discussed. The optimal operating parameters of the four factors derived through response surface method were as follows: lamp current of 1.02 mA, spectral band width of 0.26 nm, acetylene flow rate of 1 323.56 mL/min, and burner height of 8.13 mm for Cd; lamp current of 1.65 mA, spectral band width of 0.36 nm, acetylene flow rate of 2853.42 mL/min, and burner height of 6.62 mm for Cr. Under the optimal operating parameters of flame atomic absorption spectrometer, Cd and Cr in the lead zinc ore tailings slag samples were determined. The results indicated the average content of Cd and Cr was 6.9 μg/g and 42.5 μg/g respectively, the recoveries were among 96%-105%, and the relative standard deviations (RSDs) were within the range of 0.39% to 1.2%. For determination of lead zinc ore and chromite certified reference materials, the results were consistent with the certified values, which met the requirements for detection method.
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