过饱和度、反应物化学计量比及离子强度对草酸钙晶体生长的影响  

Effect of Supersaturation, Stoichiometrical Ratio and Ionic Strength on Crystallization of Calcium Oxalate

作　　者：郑辉[1] 李祥平[1] 欧阳健明[1] 

机构地区：[1]暨南大学生物矿化与结石病防治研究所化学系,广州510632

出　　处：《无机化学学报》2005年第9期1375-1378,共4页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20471024);国家自然科学基金重点项目(No.20031010);广东省"千百十工程"优秀人才培养基金(No.Q02060)

摘　　要：The effect of supersaturation, oxalate/calcium stoichiometrical ratio (Oxa2-/Ca2+) and ionic strength on the crystallization of calcium oxalate (CaOxa) was investigated in gel systems by a double diffusion technique. The supersaturation affects the morphology, phase composition, and aggregation of CaOxa crystals. To a certain con- centration, the effect of Oxa2- ions on the aggregation of calcium oxalate monohydrate (COM) was much stronger than that of Ca2+ ions. It indicated that the increase of the concentration of Oxa2- ions can more efficiently pro- mote the formation of CaOxa stones. The increase of ionic strength and the molar ratio of Ca2+/ Oxa2- also pro- motes the aggregation of COM crystals.The effect of supersaturation, oxalate/calcium stoichiometrical ratio （Oxa^2-/Ca^2＋） and ionic strength on the crystallization of calcium oxalate （CaOxa） was investigated in gel systems by a double diffusion technique. The supersaturation affects the morphology, phase composition, and aggregation of CaOxa crystals. To a certain concentration, the effect of Oxa^2- ions on the aggregation of calcium oxalate monohydrate （COM） was much stronger than that of Ca^2＋ ions. It indicated that the increase of the concentration of Oxa^2- ions can more efficiently promote the formation of CaOxa stones. The increase of ionic strength and the molar ratio of Ca^2＋/Oxa^2- also pro- motes the aggregation of COM crystals.

关 键 词：草酸钙 过饱和度 离子强度 化学计量比 凝胶 尿结石 

分 类 号：O611.65[理学—无机化学] O614.231[理学—化学]