広島県における大気,雨水,露,河川水,飲料水中の過酸化物の測定及び生成・消失機構

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Hydroperoxides such as hydrogen peroxide (H_2O_2) and organic hydroperoxides (ROOH) were measured in environmental samples in Hiroshima prefecture, Japan, during 1993-2002. Hydroperoxides were determined by fluorescence detection following an enzymatic separation of H_2O_2 from ROOH using a flow injection analysis (FIA-FD) or following a HPLC separation of individual hydroperoxides (HPLC-FD). Clear diurnal variation of H_2O_2 concentration (0.02〜1.58 ppbv) in the air was observed at Higashi-Hiroshima and H_2O_2 was correlated with O_3, solar radiation and temperature. Mean concentrations of H_2O_2 in the air were 0.67, 0.73, 2.0 and 0.81 ppbv at the south slope and summit of Mt. Gokurakuji, Hiroshima Bay and Iyo-Nada of the Seto Inland Sea, respectively, while total ROOH (ROOHs) concentrations were 1.42, 0.72, 1.4 and 0.6 ppbv, respectively. H_2O_2 in rainwater collected at Higashi-Hiroshima showed the concentration range in n.d. 〜56,400 nM (ave. 4,730 nM), with highest in summer and lowest in winter. No individual ROOH was detected in the rain waters. Dew samples contained <3,600, <353 and <179 nM of H_2O_2 in Higashi-Hiroshima, the south slope and summit of Mt. Gokurakuji, respectively, whereas ROOHs were contained <3,500, <998 and <1,300 nM, respectively. H_2O_2 concentrations (17〜301 nM) in river water samples tended to be higher (ave. 185 nM) in summer and lower (ave. 87.3 nM) in winter while ROOHs exhibited almost same concentration ranges (33〜2,000 nM) despite almost no seasonal change. Commercial natural mineral waters contained n.d. 〜1,420 and 79〜375 nM of H_2O_2 and ROOHs, respectively, whereas no peroxides were detected from tap waters. H_2O_2 could be generated by HO_2/O_2^-, which were formed by the reaction of dissolved organic matter with nitrate-induced OH radicals in natural mineral waters while no H_2O_2 would be generated in tap waters due to quick scavenging of OH with excess HClO/ClO^-, which are used for sterilization of tap waters.
日本地球化学会の論文
2006-05-25

広島県における大気,雨水,露,河川水,飲料水中の過酸化物の測定及び生成・消失機構

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