# Degradation Pesticides in both the particulate and dissolved forms are subject to degradation. The amount of pesticide that is removed from the sediment via degradation is: $$pst\_{deg,sed} = k\_{p,sed} \*pst\_{rchsed}$$ 7:4.2.8 ​where $$pst\_{deg,sed}$$ is the amount of pesticide removed from the sediment via degradation (mg pst), $$k\_{p,sed}$$ is the rate constant for degradation or removal of pesticide in the sediment (1/day), and $$pst\_{rchsed}$$ is the amount of pesticide in the sediment (mg pst). The rate constant is related to the sediment half-life: $$k\_{p,sed} =\frac{0.693}{t\_{1/2,sed}}$$ 7:4.2.9 where $$k\_{p,sed}$$ is the rate constant for degradation or removal of pesticide in the sediment (1/day), and $$t\_{1/2,sed}$$ is the sediment half-life for the pesticide (days). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://swatplus.gitbook.io/io-docs/theoretical-documentation/section-7-main-channel-processes/in-stream-pesticide-transformations/pesticide-in-the-sediment/degradation.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.