Introduction and Purpose. (i) The purpose of Phase 3 is to meas- ure kIo, the indirect photolysis rate constant in tubes, and then to cal- culate kpE for the test chemical in a natural water. If the approximate (kp)SHW determined in Phase 2 is not significantly greater than kD measured for the experiment date of Phase 2, then Phase 3 is unnecessary because the test chemical is not subject to indi- rect photoreaction.
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