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Thymol as a Biocide in Japanese Rainwater

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Abstract

Rainwater samples (wet-only; event samples) collected in Niigata in late autumn 1996 and springtime 1997 were used to assess the effectiveness of thymol as a biocide in Japanese rainwater. Upon collection each rainwater sample was divided into sub-samples, with thymol added to one sub-sample. Sub-samples with and without thymol were shipped to CSIRO, Australia, for chemical analysis. Comparison of analytical results for each pair of sub-samples proved the effectiveness of thymol in preventing biological action in this region where effects of rainwater microflaura and fauna on rainwater composition have not before been studied. Sub-samples without thymol exhibited lowered electrical conductivity, loss of the cations H+ and NH -4 , and loss of the anions HCOO-, CH3COO-, C2O 2-4 , CH3SO -3 and PO 3-4 . Nitrate showed no change in all but one of the samples, indicating that ammonia was the preferred source of nitrogen for the biological processes that consumed the rainwater organic acids and phosphate. These results suggest that thymol is a suitable rainwater biocide for use under Japanese conditions.

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Authors and Affiliations

  1. Division of Atmospheric Research, CSIRO, PMB 1, Aspendale, Vic, 3195, Australia

    G. P. Ayers, R. W. Gillett, P. W. Selleck & J. C. Powell

  2. Niigata Prefectural Research Laboratory for Health and Environment, 314-1 Sowa Niigata-shi, Niigata, 950-21, Japan

    N. Fukuzaki

  3. National Institute of Public Health, Shirokanedai 4-chome, Minato-ku, Tokyo, 108, Japan

    H. Hara

Authors
  1. G. P. Ayers
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  2. N. Fukuzaki
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  3. R. W. Gillett
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  4. P. W. Selleck
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  5. J. C. Powell
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  6. H. Hara
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Ayers, G.P., Fukuzaki, N., Gillett, R.W. et al. Thymol as a Biocide in Japanese Rainwater. Journal of Atmospheric Chemistry 30, 301–310 (1998). https://doi.org/10.1023/A:1006068415125

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  • DOI: https://doi.org/10.1023/A:1006068415125

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