It can be seen from Tables 4 and 5 that the p values of the regression model of Cr(VI) and total chromium removal efficiencies are both <0.0001, indicating that the model is extremely significant; p values of misfit terms are all >0.05, and it shows that the model fits well with the experiment, and the regression equation can be used to analyze the experimental results instead of the real points.
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Study on the Preparation of Nano-FeS Loaded on Fly Ash and Its Cr Removal Performance.
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The sentences
With the decrease of fly ash particle size, the removal efficiency of Cr(VI) and total chromium by nFeS-F showed a trend of increasing and then decreasing.