Colorimetric determination of siliceous atmospheric contaminants.
Am Ind Hyg Assoc J 1958 Feb; 19(1):54-58
A method for colorimetric determination of siliceous atmospheric contaminants is described. Particulate silica (7631869) and silicates are collected on membrane filters, dissolved in hydrofluoric-acid (7664393), and determined colorimetrically as yellow silicomolybdate (11121258) or as molybdenum-blue (66771435) after reduction with 1-amino-2-naphthol-4-sulfonic-acid (116632). The dual sensitivity obtained by the use of the two colors permits accurate analyses in the relatively large range of 1 microgram to 2.5 milligrams without the necessity of taking an aliquot. The small air volumes required were easily sampled with hand-operated equipment.
NIOSH-Author; Methodology; Colorimetry; Assays; Pollution; Sulfonic-acids
7631-86-9; 7664-39-3; 11121-25-8; 66771-43-5; 116-63-2
American Industrial Hygiene Association Journal