抄録
A study has been carried out on the atomic absorption spectrometry to determine arsenic in iron and steel by an indirect amplification procedure.
The present technique involves that arsenomolybdic acid is formed in nitric acid solution and extracted into the mixed organic solvent (n-butanol 1, iso-butyl acetate 1 and iso-amyl acetate 2) after the coexistent phosphomolybdic acid is eliminated by extracting into iso-butyl acetate, and then the amount of molybdenum associated with the arsenic is determined by atomic absotption spectrometry with a nitrous oxide-acetylene flame in the organic phase.
The method is free from interference by the coexistent elements in iron and steel.
Arsenic in iron and steel can be determined down to 2ppm with this method. The results obtained agreed with the certified valued of the standard samples. The reproducibility by the method in the coefficient of variation is 5.0, 1.7 and 2.7% for 0.2, 1.0, and 2.0μg As/ml. respectively.
