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《Periodical of Ocean University of China》 2006-03
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Methods for the Determination of Carbonate (Calcite and Dolomite) in Sediments

QIAO Shu-Qing, YANG Zuo-Sheng, PAN Yan-Jun, ZHAO Xiao-Hui(Institute of Estuarine Coastal Studies, Ocean University of China, Qingdao 266003, China)  
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.
【Fund】: 国家自然科学科学基金重大研究计划(90211022)资助
【CateGory Index】: P585.3
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