In the control group, the content of phosphate is higher than the initial concentration due to the natural evaporation of water. PL and HCQ have obvious removal effects on phosphate standard solution, with the highest removal rates reaching 96% and 95% respectively, and the lowest phosphate content dropping to 0.02 mg/L and 0.03 mg/L, respectively. The phosphorus removal effects of the two products are similar.
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