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Your search keyword '"TSUDA, SHUJI"' showing total 28 results
Start Over Author "TSUDA, SHUJI" Publisher elsevier b.v.
28 results on '"TSUDA, SHUJI"'

26. PFOS and PFOA in environmental and tap water in China

Author

Jin, Yi He, Liu, Wei, Sato, Itaru, Nakayama, Shoji F., Sasaki, Kazuaki, Saito, Norimitsu, and Tsuda, Shuji

Subjects
*DRINKING water, *CHROMATOGRAPHIC analysis, *SPECTROMETRY, *CHEMICALS, *METROPOLITAN areas
Abstract

Abstract: There is a great concern about global contamination with persistent fluoroorganic compounds including perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA), however, few data are available on the environmental levels of these chemicals in China. In the present study, therefore, environmental or tap water samples collected from various regions of China were assayed for PFOS and PFOA by solid phase extraction and liquid chromatography–mass spectrometry technique. Median concentrations (maximum concentration) of PFOS and PFOA in environmental water were 0.4 (2.4) and 0.1 (1.3) ngL−1 for the remote area (n =13), 4.0 (14.1) and 3.9 (30.8) ngL−1 for the urban area (n =22), respectively. Systematic survey was also conducted in the Hun River (n =11) and the Yangtze River (n =34). In the Hun River, the median of PFOS concentration was 4.9ngL−1, while PFOA was below the limit of quantitation (0.1ngL−1) at many of the sampling sites. The Yangtze River was moderately contaminated with both chemicals: median concentration was 4.2ngL−1 for PFOS and 5.4ngL−1 for PFOA. Remarkably high concentration of PFOA was found at 2 sampling sites of the Yangtze River (110.6 and 297.5ngL−1), but the concentration had declined to the average level at the next sampling site in both cases. Many cities provided tap water with low levels of PFOS and PFOA, however, tap water in Guangzhou and Shenzhen exceeded 10ngL−1 for both chemicals. This study revealed obvious presence of perfluorinated compounds spread out the entire territory of China, and the levels in urban area of China were almost comparable to those in the US, Europe and Japan. [Copyright &y& Elsevier]

Published
2009
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27. Perfluorosulfonates and perfluorocarboxylates in snow and rain in Dalian, China

Author

Liu, Wei, Jin, YiHe, Quan, Xie, Sasaki, Kazuaki, Saito, Norimitsu, Nakayama, Shoji F., Sato, Itaru, and Tsuda, Shuji

Subjects
*PERFLUOROCARBONS, *ATMOSPHERIC deposition, *METEOROLOGICAL precipitation, *AIR pollution, *PERFLUOROOCTANOIC acid
Abstract

Samples of precipitation events (snow and rain) in Dalian, a typical coastal town in China, were analyzed for perfluorosulfonates (PFSAs) and perfluorocarboxylates (PFCAs) to investigate atmospheric contamination by these compounds. In the snow event on December 16, 2006, samples were collected from 21 different sites and in another 6 precipitation events, samples were collected from a single location. Four PFSAs (C4, C6, C8, C10) and seven PFCAs (C6–12) were analyzed. Among the homologues, perfluorooctane sulfonate (PFOS) concentrations were the highest with a geometric mean (GM) of 145 ng/L (n =21) during the snow event on December 16, 2006, followed by perfluorooctanoate (PFOA) with a GM of 24.7 ng/L (n =21). Concentrations of perfluorobutane sulfonate (PFBS), perfluorohexane sulfonate (PFHxS) and perfluoroheptanoate (PFHpA) were more than two orders of magnitude lower than that of PFOS. Other PFSAs and PFCAs were found to be below the limit of detection in all the samples. In other 6 precipitation events, PFSAs and PFCAs were detected approximately in the same order of magnitude in both snow and rain. The results indicate that wet deposition may be a potential transport mechanism of perfluorinated chemicals in the environment. [Copyright &y& Elsevier]

Published
2009
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