A multi-pumping flow system with pulsed fluidization to evaluate soil capacity for phosphate adsorption

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Soils with high levels of iron and aluminum, thus negatively the phosphorous availability, affecting crop yields. A prior determination of the soil capacity to adsorb phosphate is relevant to attaining good agricultural performance. To this end, a multi-pumping flow system with pulsed fluidization is proposed. The procedure takes into account the amount of remaining phosphorus (P-rem) in the solution after the adsorption step to indirectly estimate the soil retention capacity. A 1.0 mg L-1 P solution is passed through a fluidized bed column with 50 mg of soil (particles < 0.15 mm), where the analyte is adsorbed. P-rem was spectrophotometrically quantified by the molybdenum blue method. The coefficient of variation (n = 20), limits of detection and quantification (99.7% confidence level), and sampling rate were estimated as 1.54%, 17 and 51 μg L-1 P, and 87 h-1, respectively. Only 0.27 mg (NH4)6Mo7O24 and 0.10 mg SnCl2 were consumed per determination, generating 2.4 mL of waste. The results followed a linear relationship [y = 0.9702x + 1.483 (r = 0.9635; n = 20)] with the reference procedure. In comparison to the reference procedure, 100, 40 and 180-fold reductions in the required soil amount, waste generation and analytical time were attained.




Machado, J. M. C., Melchert, W. R., Zagatto, E. A. G., & Kamogawa, M. Y. (2017). A multi-pumping flow system with pulsed fluidization to evaluate soil capacity for phosphate adsorption. Journal of the Brazilian Chemical Society, 28(7), 1149–1157. https://doi.org/10.21577/0103-5053.20160273

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