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This work aimed to evaluate isothermic adsorption of Phosphorous and Zinc separately and their interaction on Bentonite minerals. Five concentrations of each element viz. 0, 50, 100, 150, and 200µgL-1, and their interaction concentrations of 0+0, 50+50, 100+100, 150+150, 200+200µgL-1 were used. Langmuier equation was used to calculate Xm and k. Estimating quantity and intensity curves (Q/I) and buffering capacity, as 2.5g of Bentonite was treated with increasing concentrations of P and Zn using K2HPO4 and ZnSO4.7H2O, respectively, 0, 0.2, 0.4, 0.8, 2 and 4mmol l-1. The suspension was shaken for 3 hours and left for 24 hours to equilibrate, then the concentration of both P and Zn in the filtrate was extracted and estimated. The relationship between the quantity (adsorbed amount of e element) and the intensity (ionic activity) was drawn. From the slope of the straight line equation, the buffering capacity of the element was calculated. The results showed a significant increase in P and Zn adsorbed with the increase in levels of addition. Effect of interaction between two elements showed a significant increase in P adsorbed at the last two levels, whereas no significant increase was observed in addition of 50 and 100 µg ml-1. The adsorbed Zn increased as a result of interaction between two elements. The value of Xm for adsorption of P was 114.94μg g-1 in of adding P, and this value was not affected when P and Zn were added together. For Zinc, maximum adsorption capacity value in adding zinc alone was 204.08μg g-1, and the value was similar in adding two elements together. Binding energy (k) was 0.056ml μg -1 by adding P alone, and increased slightly when adding two elements together (0.081μg g-1at adding Zinc), and binding energy was 0.005ml μg -1 and slightly increased when adding two elements together (0.006ml μg -1). The adsorbed amount of Z. was higher than P and binding energy is lower. Buffering capacity of P in Bentonite was 13.28 mg P kg-1 Bentonite, and it is considered an average with its P content whereas, Zinc had 341.84 mg kg-1 considering mineral with a high Zinc content.


Adsorption Bentonite Phosphorous and Zinc Buffering capacity

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AL-RUBAIE, I. M. R., DADOOSH, A. H., & NASSER, K. M. (2022). Adsorption of Phosphorous and Zinc, and their interaction and processing power on Bentonite. Iranian Journal of Ichthyology, 9, 250–257. Retrieved from


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