采用扫描电子显微镜(SEM)、X射线衍射(XRD)和原子吸收光谱(AAS)等方法研究了水溶液中分子质量分别为400、4000、6000和12000的聚乙二醇(PEG)对尿结石矿物一水草酸钙(COM)结晶的影响.上述四种PEG均能抑制COM晶体的成核和生长.随着PEG分子质量减小,其与Ca2+离子配位能力逐渐增加,抑制COM生长的能力增强,导致上层清液中可溶性Ca含量增加.随着PEG分子质量减小,或PEG浓度增加,其诱导的COM晶体的{010}晶面增强,{101}减弱.
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