Abstract
A fast and accurate microwave-assisted digestion method for arsenic determination by flame atomic absorption spectrometry (FAAS) in typical, complex residues from gold mining is presented. Three digestion methods were evaluated: an open vessel digestion using a mixture of HCl:HNO 3:HF acids (Method A) and two microwave digestion methods using a mixture of HCl:H 2O 2:HNO 3 in high (Method B) and medium-pressure (Method C) vessels. The matrix effect was also investigated. Arsenic concentration from external and standard addition calibration curves (at a 95% confidence level) were statistically equal ( p-value = 0.122) using microwave digestion in high-pressure vessel. The results from the open vessel digestion were statistically different ( p-value = 0.007) whereas in the microwave digestion in medium-pressure vessel (Method C) the dissolution of the samples was incomplete.
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