Abstract：The determination method of cobalt in copper matte by flame atomic absorption spectrometry (FAAS) was established in 5% (volume fraction) hydrochloric acid medium using air-acetylene flame. The determination wavelength was 240.7nm. The sample dissolution experiments indicated that the sample could be completely dissolved in most cases under the following conditions: the sample was dissolved in 20mL of aqua regia, 1mL of hydrofluoric acid and 2mL of perchloric acid; then 10mL of hydrochloric acid (1+1) was added to dissolve the salts. If the dissolution of sample was not complete, 5mL of nitric acid should be added. The solution was further heated until the brown red fume disappeared. Then 2mL of perchloric acid was added until white fume appeared. The sample could be completely dissolved. Under the selected instrumental conditions, the mass concentration of cobalt showed good linear relationship with the absorbance. The correlation coefficient was 0.9992, and the detection limit was 0.0075μg/mL. The interference tests showed that the coexisting elements in sample had no interference with the determination of cobalt. The experimental method was applied for the determination of cobalt in four copper matte samples. The Grubbs test of determination results was conducted. The results showed that there was no abnormal value in parallel determination (n=11). The relative standard deviations (RSD, n=11) were between 1.7% and 8.5%. Two copper matte samples with different cobalt content gradients were determined according to the experimental method, and the found results were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The recoveries were between 90% and 105%. The determination of copper matte sample was conducted in six laboratories according to the experimental method. The repeatability limit of method was r=0.0006+0.0429m, and the reproducibility limit was R=0.0046+0.0647m.
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