STP707: Relationship Between Water Solubility, Soil Sorption, Octanol-Water Partitioning, and Concentration of Chemicals in Biota

    Kenaga, EE
    Research scientist, Health and Environmental Science, and laboratory director of research, Agricultural Products Department, Dow Chemical Co., Midland, Mich.

    Goring, CAI
    Research scientist, Health and Environmental Science, and laboratory director of research, Agricultural Products Department, Dow Chemical Co., Midland, Mich.

    Pages: 38    Published: Jan 1980


    Abstract

    There is a need for a method of preliminary estimation of bioconcentration factors in fish and soil sorption coefficients for chemicals. A data base was assembled for 170 compounds having average values for these two parameters and also average values for water solubility and n-octanol-water partition coefficients. Binary regression equations between the logarithms of these values gave correlation coefficients that were all significant below the 1 percent level. Using these equations, measured average values for any of the four parameters could be used to estimate average values for the unmeasured parameters. The 95 percent confidence limits for the calculated values were about ±1 to 3 orders of magnitude of the measured values. The relatively large variation of the actual from the predicted values was due both to the variation in the type of methodology used to make the measurements and also to the intrinsic variation in values attributable to the nature of the chemicals, the characteristics of the soils and fish, and the environmental conditions employed in the studies. Much less variation between actual and predicted values has been achieved when more uniform methodology is adopted for measuring these parameters. Despite the variability, the data are useful for early assessment of the potential for bioconcentration and mobility in the environment. Knowledge of the two factors is needed for hazard assessment in the environment.

    Bioconcentration factor values for Daphnia appear to be as valid for correlation purposes as those for fish.

    Keywords:

    aquatic toxicology, water solubility, soil sorption, n, -octanol-water partitioning, bioconcentration, partition coefficients, predictive equations


    Paper ID: STP27410S

    Committee/Subcommittee: E35.30

    DOI: 10.1520/STP27410S


    CrossRef ASTM International is a member of CrossRef.