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Zinc and manganese sorption behavior by natural zeolite and bentonite
2011
Iskander, A.L. | Khald, E.M. | Sheta, A.S.
Understanding the sorption process in natural zeolite and bentonite is necessary for effective utilization of these minerals as nutrient adsorbents and on the other side for controlling release of plant nutrients. This research was undertaken to characterize the ability of natural zeolite and bentonite minerals to adsorb and release zinc and manganese. The potentials for sorption of these ions were evaluated by applying the Langmuir and Freundlich equations. The results showed that Langmuir constant (maximum adsorption (b mmol kg-1)) of both Zn and Mn were for bentonite zeolite While the [binding strength values (k in L.mmol1 for zeolite bentonite Zn in case of zeolite showed the lowest desorbed percentage particularly at high levels of sorbed Zn. Only, 74.7 % is readily extractable by DTPA after three successive extractions leaving, 25.3 % Zn retained by the mineral. In case of bentonite, 82.26 % of sorbed Zn is readily extractable by DTPA after three successive extractions leaving, 17.74 % Zn retained by the mineral. In case of Mn, 84.63% of Mn sorbed by zeolite is readily extractable by DTPA after three successive extractions leaving, 15.37% Mn retained by the mineral. In case of bentonite, 89.79 % of adsorbed Mn is readily extractable by DTPA after three successive extractions leaving, 10.21 % Mn retained by the mineral. This finding may reflect clearly the possibility of using natural zeolite and bentonite as a slow release fertilizer for Zn and Mn and on the other hand preventing soil pollution with heavy metals.
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2001
Khamis, M.A. (Zagazig Univ., Moshtohor (Egypt). Faculty of Agriculture) | Awad, S.M. | Sharaf, A.N. | Abu-El-Azm, S.k.
Effect of sludge on the availability of heavy metals in sandy soil. 1.- distribution of added zinc, copper and nickel forms
1996
Eid, M.A. (Ain-Shams Univ., Cairo (Egypt). Faculty of Agriculture)
Effect of phosphorus and zinc fertilization on some nutrients content of mango seedlings
2001
Sharaf, M.M. (Zagazig Univ., Moshtohor (Egypt). Faculty of Agriculture) | Awad, S.M. | Sharaf, A.N. | Abu-El-Azm, S.K.
