By Thomas W. Duke (auth.), Mohammed Abdul Quddus Khan (eds.)

Water covers approximately two-thirds of the outside of earth, yet in basic terms 0.627 percentage of this water is the candy floor and subsurface water on hand for the survival of freshwater organisms together with guy (1,2). a few of this clean or candy water lies in essentially uninhabitable areas (rivers: }1ackenzie in Canada; Amazon in imperative the US; Ob, Yenesey, and Lenta in Siberia, etc.). additionally, many of the significant rivers (the Mississippi in u.s., the Rhine in Europe, the Volga in U.S.S.R., the Ganges in India, etc.), simply because they move via agricultural land or city and commercial parts, became hugely infected with chemical substances (3). This leaves us with shrinking assets of candy floor water. within the usa, the responsible offers of this water are already dwindling in towns like manhattan and l. a. and states like New Mexico and Texas (3).

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And Hutzinger, O. 1973. Analab Res. Notes 13: 14. FATE OF PESTICIDES IN AQUATIC ENVIRONMENTS H. V. Morley INTRODUCTION In the short time available it is obvious justice cannot be done to the subject of this presentation and that a high degree of selectivity combined with a great deal of ability to compress and summarize data will be required. For this reason it will be assumed that the pesticide has already been transported to aquatic ecosystems from direct application, from runoff waters, or from the atmosphere.

HAQUE, P. C. KEARNEY, AND V. H. FREED high solubility have lower bioaccumulation. more apparent in Fig. 5. This is Solubility, then, offers one of the simplest parameters for predicting the adsorption characteristics of a pesticide in the aquatic environment. Once accurately measured, i t provides a reasonable indicator for potential bioaccumulation. LITERATURE CITED Freed, V. , Schmedding, D. and Koluist, R. 1976. Environ. , 13: 77. Duke, T. , Lowe, 1. J. and Wilson, A. J. Jr. 1966. Bull. Environ.

From the magnitude of the partition coefficient data, the extent of bioaccumulation of pesticides can be predicted qualitatively. Such a prediction was based on the correlation which existed between partition coefficient and bioaccumulation potential of many organic chemicals (Fig. , 1974). The two methods in predicting bioaccumulation potential are described as follows: Indirect Method; Partition Coefficient: The partition coefficient P used in predicting bioaccumulation can be defined according to the equation P = (ii) [C 2 J water where Cl and C2 are the concentrations of the pesticide in octanol and water, respectively.

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