A simple method for the determination of chromium in natural waters and sewage final effluents by atomic-absorption spectrophotometry using an air-acetylene flame is described. The sample is concentrated by evaporation by a factor of five. Interference effects were minimised by the addition of ammonium perchlorate and were further reduced by working with a flame on the verge of luminosity rather than a distinctly luminous flame.
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Thompson et al. (1979) studied this question.
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