クロラニル酸バリウム試薬を用いた吸光光度法による大気中の硫酸ミストの定量

抄録

A study was made on the determination: of sulfuric acid aerosol in an atmosphere. A sulfuric acid aerosol and air-borne particulate matter in an atmosphere were captured on a teflon filter. A teflon filter was placed in a glass-stoppered test. tube and 2-propanol was added to it to extract sulfuric acid aerosol. The 2-propanol extract was centrifuged. A 7 mi of supernatant solution was put into a glass-stoppered test tube and 2.7 ml of water and O.3 ml of buffer solution (pH 5.6) were added to it. After addition of 50 mg of powdered barium chloranilate to it, the test tube was shaken and then allowed to stand. After filtration, the absorbance of the filtrate at a wavelength of 330 nm was measured. It was found that the detection limit of this method was 2 μg/m³ when air was sampled during 50 min at a rate of 20 1 per min. The method was applied to a practical determination of sulfuric acid aerosol in air at Setagaya, Tokyo. As a sesult, it was found that the concentration of sulfuric acid aerosol was 2-11μg/m³ and the proportion of sulfates was 10-53%. The concentration of sulfuric acid aerosol increased with increasing photochemical smog in summer.