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Aquatic Herbicide Testing, Toxicity, and EPA Registration

... mg/L in hard water 2-8 days adsorption , precipitation Diquat .37 mg/L 230 mg/kg 245 mg/L 1-7 ... Photolysis – breaking down in sunlight Precipitation – falling out of solution and sinking to the bottom ...

Copper Considerations

... does not disperse widely in treated waterbodies due to precipitation , settling, adsorption Formulation ... with high alkalinity (greater than 250ppm) Copper precipitation less of a concern with chelated copper formulations ...