Multi-toxicant evaluation of mixtures of chemicals from among the environmental water quality standards in Japan using aquatic organisms
2002
"Kodama, A. (Kyushu Univ., Fukuoka (Japan)) | Kinoshita, Y. | Ishibashi, K. | Yamaguchi, K. | Nakagawa, H. "
"This study was conducted in order to evaluate the combined action of chemicals on the growth of the green alga, Selenastrum capricornutum and on the glucose consumption of microorganism populations in medium where many chemicals from among the environmental water quality standard items relating to human health in Japan coexist. Tests were conducted under three conditions: (1) medium containing a mixture of the standard levels of 13 chemicals from among the environmental standard items (26 chemicals); (2) medium containing a mixture of the guideline levels of 18 chemicals from among the items requiring close monitoring (22 chemicals); (3) medium contain-ing a mixture of the standard levels plus the guideline levels of a combination of the 31 chemicals from among the environmental standard items and the items requiring close monitoring (environmental water quality standard items). The three kinds of tests and their respective dispersant controls (A), (B) and (C) were the same as regards the concentrations and kinds of dispersants used. The results are summarized as follows. 1) At the end of the growth inhibition tests, the number of cells of the test alga in the above tests (1), (2) and (3) had decreased to 57.9, 63.3 and 56.6%, respectively, in comparison with the findings for each of the dispersant controls. The growth of the test alga was inhibited under each of the three test conditions. 2) At the end of the glucose consumption inhibition tests, the amount of glucose con-sumption of the test microorganisms in the above tests (1), (2) and (3) had decreased to 60.1, 58.9 and 63.7%. respectively, in comparison with the findings for each of the dispersant controls."
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