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Your search keyword '"Uchida, Yoko"' showing total 5 results
Start Over Author "Uchida, Yoko" Topic occupational exposure
5 results on '"Uchida, Yoko"'

3. Benzene exposure in a Japanese petroleum refinery

Author

Uchida Yoko, Kawai Toshio, Ikeda Masayuki, and Yamaoka Kazutoshi

Subjects
Chemistry, Oil refinery, Benzene, Environmental Exposure, General Medicine, Toxicology, Refinery, chemistry.chemical_compound, Petroleum, Japan, Environmental chemistry, Humans, Maximum Allowable Concentration, Occupational exposure, Benzene vapor, Diffusive sampling, Environmental Monitoring
Abstract

Time-weighted average (TWA) intensity of exposure of workers to benzene vapor during a shift was monitored by diffusive sampling technique in a Japanese petroleum refinery. The subjects monitored (83 in total) included refinery operators, laboratory personnel and tanker-loading workers. The results showed that the time-weighted average exposures are well below 1 ppm in most cases. The highest exposure was recorded in 1 case involved in bulk loading of tanker ships, in which exposure of over 1 ppm might take place depending on operational conditions. The observation was generally in agreement with levels previously reported.

Published
1990
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4. Exposure of workers to a mixture of toluene and xylenes. I. Metabolism.

Author

Huang, Mei-Yuan, Qu, Qing-Shan, Liu, Yu-Tang, Li, Bao-Hua, Jin, Chui, Inoue, Osamu, Uchida, Yoko, Nakatsuka, Haruo, Watanabe, Takao, Ikeda, Masayuki, Huang, M Y, Jin, C, Liu, Y T, Li, B H, Qu, Q S, Uchida, Y, Inoue, O, Nakatsuka, H, Watanabe, T, and Ikeda, M

Subjects
METABOLISM, THRESHOLD limit values (Industrial toxicology), TOLUENE, URINALYSIS, XYLENE, ALCOHOL drinking, INDUSTRIES, SMOKING, TIME, OCCUPATIONAL hazards, ENVIRONMENTAL exposure, BENZENE derivatives
Abstract

The urinary excretion of hippuric acid and methylhippuric acid was studied in workers (233 subjects; 122 men and 111 women) exposed to toluene and xylenes in combination and in non-exposed controls (281 subjects; 141 men and 140 women) recruited from the same factories or factories of the same regions. Smoking and drinking habits of the subjects were obtained by medical interviews. From each worker, one urine sample was collected at the end of a shift and analysed for hippuric and methylhippuric acids by high performance liquid chromatography. Air samples for the estimation of toluene and xylenes were collected with diffusive personal samplers. There was a linear correlation between the time weighted average exposure either to toluene or xylene isomers and the concentrations of hippuric acid or methylhippuric acid isomers in urine. Essentially no difference was found in the correlation between quantitative exposure and excretion in the three xylene isomers. Comparison of the slopes of regression lines indicated the absence of metabolic interaction between toluene and xylenes at the measured concentrations. The metabolism of toluene and xylenes was significantly reduced among smokers or drinkers compared with non-smokers and non-drinkers. [ABSTRACT FROM AUTHOR]

Published
1994

5. Exposure of workers to a mixture of toluene and xylenes. II. Effects.

Author

Chen, Zhen, Ikeda, Masayuki, Watanabe, Takao, Yin, Hong, Nakatsuka, Haruo, Uchida, Yoko, Cai, Shi-Xiong, Liu, Shi-Jie, Ukai, Hirohiko, Yao, Yi-Min, Chen, Z, Liu, S J, Cai, S X, Yao, Y M, Yin, H, Ukai, H, Uchida, Y, Nakatsuka, H, Watanabe, T, and Ikeda, M

Subjects
TOLUENE, XYLENE, THRESHOLD limit values (Industrial toxicology)
Abstract

The health effects of exposure to a mixture of toluene and xylene isomers was studied on the fourth or fifth days of a working week in factories in China. The study population comprised 233 subjects (122 men and 111 women), who were exposed to the time weighted geometric mean (maximum) concentrations of toluene (3 (203) ppm) and xylenes (4 (103) ppm). For comparison, 241 non-exposed controls (116 men and 125 women) were recruited from the same regions. The prevalence of some subjective symptoms significantly increased in the exposed population, and the symptom profiles were similar to those found after exposure to toluene or xylenes alone. Haematology and serum biochemistry did not show notable changes. It seems reasonable to conclude that the effects of the toxicities of toluene and xylenes in combination are additive. [ABSTRACT FROM AUTHOR]

Published
1994
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