【摘要】 研究河流和浅海陆架沉积物中的碳酸盐成因和生成环境,探讨河流和陆架沉积物中碳酸盐含量的影响因素和测定方法。结果表明,沉积物中碳酸盐含量明显受沉积物粒度组成和物源的影响。1mol/LHAc+lmol/LNaAc(在沸水浴加热30min),0.3mol/LHAc(室温下5h)和1mol/LHCl(室温下2h)分别做碳酸盐相+离子交换相的浸取液,lmol/LNaAc(在沸水浴加热30min)做离子交换相的浸取液,然后用ICP-AES测得浸取液中Ca和Mg离子含量,差减法计算样品碳酸盐相中Ca,Mg离子和碳酸盐含量。其中前两者与第四种相结合的方法,都能得到河流沉积物碳酸盐相中的Ca离子含量。而第三种方法,即1mol/LHCl(室温下2h),破坏了沉积物中的粘土矿物,不能用来作为沉积物碳酸盐相+离子交换相中Ca和Mg离子的浸取液。与使用ICP-AES测定离子含量计算得出的碳酸盐含量的方法相比较,容量法是1种操作简单、花费低廉且有效的方法。更多还原

【Abstract】 Methods for the determination of carbonate content in sediments and its influencing factors were studied. The results show that carbonate content is influenced by grain-size composition and source of the sediments. 1mol/lHAc+lmol/lNaAc, 0.3mol/lHAc and 1mol/lHCl were used as infusions for ion-exchange +carbonate phase and lmol/lNaAc was utiliaed for the ion-exchange phase respectively, then Ca and Mg ion in the obtained infusions were determined by ICP-AES. The contents of Ca, Mg and carbonate were calculated by using subtraction calculation procedure in the carbonate phase. Both of the first two methods combined with the fourth can be used to determine Ca content in river-sediments. Because the third kind of method, 1mol/LHCl, can destroy clay minerals in sediments, it can not be used as an infusion for the ion-exchange +carbonate phase. The volumetry method has the advantages of easy operation, low specific investment cost and effectiveness in measurly carbonate contents compared with determining Ca and Mg contents in various infusions using the ICP-AES method.更多还原