The multi-element analysis of airborne particulate matter collected on glass-fibre filters by various acid mixture digestion procedures and inductively coupled plasma atomic emission spectrometry (ICP-AES) was studied. In order t o achieve sensitive and reliable multi-element analyses, the analytical blanks obtained as a result of the dissolution of the matrix elements in the filter media during the digestion procedures were evaluated. It was found that, of the methods tested, digestion of the airborne particulates with concentrated HN03 -HCIO4 under pressure followed by the addition of HF after removal of the intact filter membrane from the solution is the best pre-treatment procedure for multi-element analysis by ICP-AES. The possible effect of concomitant elements in the dissolved sample solution was also evaluated and corrected. A recovery study was conducted using National Bureau of Standards Standard Reference Material 1648 Urban Particulate to examine the accuracy of the analytical results. Sixteen major, minor and trace elements in airborne particulate matter were determined effectively.
The determination of trace iron(II) is' usually interfered by the presence of iron(Ill) when ortho-phenanthroline colorimetric method is used. In this report a chromogenic reagent which contain'S onho-pbenantnroline-Blj'I'A mixture has been developed to decrease the interference of ferric ion after adjusting the acidity of sample at 0.1 N by adding the sulfuric acid. .The procedure -is also simplified by introducing sulfamate buffer solution (pH == I.S) without adjusting the acidity of sample with 'Sulfuric acid. If iron(I1l) is not present in the sample. this method is also applicable. The comparative results are exhibited for the present method and the conventional o-phenanthroline method.
Neutron activation analysis has been applied to the determination of trace of antimony based on the substoichiometric extraction of Sb(III) with BPHA (N‐benzoyl‐N‐phenyl hydroxylamine). The antimony contens in trichlorosilane or high purity silicon can be determined by the proposed method down to ppb range. The effect of acid concentration, shaking time, the amount of carrier and the decontamination factors were studied.
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