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《Environmental Science & Technology》 2012-05
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Adsorption of Potash by Several Natural Porous Minerals and Slow-Releasing Effect of Potash Fertilizer

LIU Ai-ping,FENG Qi-ming,WANG Wei-qing,HE Li-li,LIU Sui-hai(College of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China)  
This paper presented an experimental study related to slow-release potash fertilizer,in which KCl as a potash source,natural porous minerals,i.e.clinoptilotite,bentonite and attapulgite clay,as slow-release carriers,focusing on adsorption and desorption properties of these porous minerals.Relationship between adsorption capacity and adsorption time and initial concentration of K+ in the solution was investigated for clinoptilotite,bentonite,and attapulgite clay,respectively,giving results of their maximum K+ adsorption capacities.Also desorption of K+ from the minerals was studied with the conditionas HCl solution(pH 5) containing different concentrations of Ca2+ and Mg2+.It was found adsorption curve of attapulgite clay fit the Freundlich equation in general,and potash fixation capacity of clinoptilotite ranked first,followed by attapulgite and then bentonite.
【Fund】: 国家自然科学基金资助项目-青年基金(40502008)
【CateGory Index】: X592
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