Optimization of the removal efficiency of three biodegradable chelating agents for soil cadmium.

Table 2 , Table 3 , Table 4 show that the model was highly significant (P < 0.001) and all misfit terms were greater than 0.05, indicating that the model is effective for data analysis and can better simulate the effects of three independent variables: pH, time, and concentration on the removal rate of Cd [ 29 ].

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On the other hand, the leaching effect showed a trend of rapid increase and then levelling off with the decrease of the pH of PMAS.

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