原子吸光法による空気中水銀の金属, 無機ならびに有機の分離定量法について

Abstract

Determination of organic and inorganic mercury compounds and of metallic mercury in the air was studied by using 0.1% L-cystein aqueous solution as absorbent with the atomic absorption spectrometry. The results obtained were as follows.1. To catch mercury compounds, impingers were employed. 0.1% L-cystein aqueous s. was used in the first and the second catching bottles. Into third and fourth bottles, 5% H2SO4 aqueous s. and KMnO4 0.5% aqueous s. were poured respectively. Organic and inorganic mercury compounds were caught in the first two bottles, while metallic mercury was caught in the last two quantitatively with perfect selection.2. Organic compounds were twice extracted from L-cystein aqueous s. by benzene. From benzene layer, organic mercury compounds wers extracted in L-cystein aqueous s. again. After organic and inorganic mercury compounds and metallic mercury contained in the sample had been decomposed by H2SO4 and KMnO4, they were reduced to metallic mercury by SnCl2 to be determined separately by the atomic absorption spectrometry. By this procedure, analytical processes became very simple and acurate results were obtained.3. Analytical sensitivity of this method was 0.1μg Hg/m3 air at the minimum.4. In a workshop where phenyl mercuric acetate was being synthesized, mercury in the indoor air was determined by this method, and it was recognized that detected organic mercury was less than 20% and inorganic and metallic mercury were 72.9-76.3% and 6.9-13.6% of the total mercury.