Rationale. The foregoing procedure is designed to produce a standard humic-containing solution that is pH controlled, and sufficiently aged that its photobleaching first-order rate con- stant is not time dependent. It has been demonstrated that after 7 days of winter sunlight exposure, SHW solu- tions photobleached with a nearly con- stant rate constant (Mill et al. (1983) under paragraph (f)(11) of this section).
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