摘要：The contents of polyoxyethylene nonionic surfactants (as iodobismuthate active substances : BIAS), methylene blue active substances (MBAS) and ignition losses in the river sediments were determined in Kanagawa Prefecture from 1986 to 1989. The concentrations of BIAS and MBAS detected in the river sediments (n=18) were 2.1-160 μg/g and 3.0-800 μg/g, respectivery. The relationship between BIAS and MBAS showed high correlation (R=0.97) and the ratio of the concentration of BIAS to that of MBAS was 1 : 2.6. BIAS and MBAS have been correlated with the ignition loss and the coefficient of the correlation was 0.90 and 0.91, respectively. Therefore, it was considerated that BIAS and MBAS adsorption on the sediments were related with the contents of organic matters of the river sediments. Experimental results on absorption and desorption behavior of BIAS on the river sediments suggested that accumulation of BIAS was related with the contents of organic matters of the river sediments and with the shape of the sediments.
