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海洋沉积物中有机碳、无机碳连续测定法——过硫酸钾-非水溶液滴定法
李亮歌¹, 许金树¹
福建海洋研究所

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SEQUENTIAL DETERMINATION OF ORGANIC C AND INORGANIC C IN MARINE SEDIMENTS BY PERSULFATE-NONAQUEOUS TITRATIONS

Abstract:

This paper presents the titrimetry of persulfate-nonaqueous solution with sequential determination of the organic and the inorganic C contents in marine sediments. In a particularly designed paired-ball reactor, the inorganic and organic C contents of a sample was determined separately, yet simultaneously. The carbonates need not be separated beforehand. The Ag₂SO₄ was used as a catalyst and the time of oxidization was shortened considerably. The optimal conditions have been found. That is, the carbonates of samples are reactivated initially with 3M H₃PO₄, the inorganic C content is obtained, and then the K₂S₂O₈ (oxidizer) and Ag₂SO₄ added to the reactor. The reactionary temperature is controlled within 120-130℃ and the organic C content is determined. This method, which is more accurate, simple and rapid, has been successfully applied to the analysis of samples of Oceanic sediments with excellent precision of less than ±0.02%.

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