Transformation of Coordinate Forms of Phosphate Ad－sorbed on Goethite Snrfaces Under Conditions of Vary－ing pH  

作　　者：JIE XIAO-LEI LIU FAN ZHOU DAI-HUA XU FENG-LIN LI XUEYUAN andWANG DIAN-FEN(Hnazhong Agricultural University, Wuhan 430070 ( China)(Wuhan University of Technology, Wuhan 430O70 (China) 

出　　处：《Pedosphere》1995年第3期229-235,共7页土壤圈（英文版）

摘　　要：X-ray photoelectron spectroscopy (XPS) and automatic titrimeter were nsed to study the relation be-tween pH and the transformation of the coordinate forms of P on goethite surfaces. The results showed thatfor a given P concentration, increasing the pH of suspension could cause a fast transformation of monodentatecomplexes of phosphate ions on goethite surfaces to binuclear ones. When lowering the PH, additional adsorp-tion of P occurred and the binuclear complexes reverted slowly to the monodentate ones. The dissociationand association of protons of the sorbed P caused by PH changes was considered to be a major reason lewtingto the transformation of the coordinate forms of P on the surfaces. The stability of binuclear surface complexof P was greater than that of monodentate complex. The possible reactions on the interface of goethite andsolutions with pH changes, and the reasons causing the different stabilities of the two coordinate P complexesare discussed in the paper.ＴｒａｎｓｆｏｒｍａｔｉｏｎｏｆＣｏｏｒｄｉｎａｔｅＦｏｒｍｓｏｆＰｈｏｓｐｈａｔｅＡｄ－ｓｏｒｂｅｄｏｎＧｏｅｔｈｉｔｅＳｎｒｆａｃｅｓＵｎｄｅｒＣｏｎｄｉｔｉｏｎｓｏｆＶａｒｙ－ｉｎｇｐＨＪＩＥＸＩＡＯ－ＬＥＩ；ＬＩＵＦＡＮ；ＺＨＯＵＤＡＩ－ＨＵ...

关 键 词：coordinate form GOETHITE PH PHOSPHATE X-ray photoelectron spectroscopy 

分 类 号：S153.61[农业科学—土壤学] S153.4[农业科学—农业基础科学]