抄録
The seasonal variations of concentrations and loadings of the polyoxyethylene nonionic surfactants (as iodbismuthate active substances : BIAS) and some of the water qualities were investigated in the Sakai river in Kanagawa prefecture, from 1980 to 1982. The daily variations were also investigated at Tsuruma-bashi, where was strongly polluted by mainly domestic wastes in the Sakai river, September 16-17, 1981 and Janualy 6-7, 1982. Results obtained were as follows :
(1) BIAS concentrations and loadings in the river water of the winter were the highest values of four seasons and BIAS concentrations of the winter were about twice higher than that of the summer.
(2) the daily variations of BIAS loadings were similar in variations to daily life-cycle.
(3) The ratio of sum of BIAS loadings of a day to sum of BIAS loadings from A.M. 10 to P.M. 2 was 100 : 39.
(4) Correlation coefficients were calculated between stream-flow and concentrations of BIAS, MBAS, BOD, TOC and T-P. These values showed high correlation between each parameters and each correlation coefficients was o.7 or more.
(5) The ratio of BIAS concentrations to total LAS (linear alkylbenzen sulfonate, C10-C14) on the daily variations were 1 : 2.3, and the coefficient BIAS concentration and total LAS was 0.77.
