EPA Method 835.1110

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EPA Method 835.1110:
Activated Sludge Sorption Isotherm

The isotherm test should be run at constant temperature and pH. Temperature control can be accomplished using a bath or constant temperature room. pH should be controlled using buffers. Preliminary tests should be run to assure that there are no interactions between test compound and buffer (such as complexation with the buffer) that could affect sorption of the test compound. This test is accomplished by dosing the test compound into a mixture of buffer and clean water at the isotherm test?s target concentration. The dosed mixture should be mixed for a time period equal to the anticipated duration of the isotherm test. Analytical tests and visual observation of the test compound in the buffered mixture should be performed to verify that no chemical interactions or buffer-catalyzed degradation of the test compound has occurred.

This guideline is intended to meet testing requirements of both the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) (7 U.S.C. 136, et seq.) and the Toxic Substances Control Act (TSCA) (15 U.S.C. 2601).