二维琼脂凝胶体系中过渡金属离子对草酸钙晶体生长和周期性沉淀的影响

Influences of transition metal ions on crystallization of calcium oxalate and the formation of periodic ring precipitation

在二维凝胶圆盘体系中,研究过渡金属离子对草酸钙晶体生长和周期性环状沉淀的影响,并对其形成机理进行探讨。结果表明:在一定浓度的Fe3+存在下,体系中出现了周期性环状沉淀现象。同时发现在此条件下抑制了一水合草酸钙(COM)晶型生成。此外,加入Zn2+、Co2+、N i2+体系中的晶体都以二水合草酸钙(COD)为主;而加Cu2+离子的圆盘中,三水合草酸钙(COT)占据了主要的成分,这说明不同的过渡金属离子对三种草酸钙晶型的生成影响不同。另外,还对出现的与尿结石有关的特殊现象(白斑和放射状的条纹)进行了探讨。

Influences of transition metal ions on crystallization of calcium oxalate and the formation of periodic ring precipitation were investigated in the two - dimensional agar gel system. The results indicate that periodic ring precipitation produced with a certain concentration of Fe^3＋ , and the formation of COM was inhibited . In addition , the main crystal form is COD in the gel with Zn^2＋ , Co^2＋ , Ni^2＋ , while COT in the gel with Cu^2＋. These results show that different metal ions had different influence on the crystallization of CaC2O4. Furthermore , the special phenomena in agar gel which was similar to the blaze and the radial stripes in urinary stone were discussed.