Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments
Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments
复制标题
酸浸法测定海洋沉积物中有机碳和无机碳含量的缺陷
DOI：
10.1007/s13131-020-1631-z
复制
发表时间：
2020
影响因子：
1.4
通讯作者：
ez A.
中科院分区：
文献类型：
--
作者：
Ling C.;Liu Z.;Zhang J.;Zhao Y.;Zhang Y.;Fern;ez A.
海洋沉积物中有机碳和无机碳的含量对重建海洋生产力、全球碳循环和气候变化具有重要意义。因此，需要一种合适的方法来分离和测定有机碳和无机碳。尽管最好的方法仍然存在争议，但酸浸法因其使用方便和准确度高而被广泛应用于许多实验室。沉积物捕集器样品的元素分析结果表明，酸浸法无法获得有机碳和无机碳的含量，根据数学推导，当脱碳样品的碳含量为12%±1%时，会造成无限大的误差。酸熏法和气量法进行了比较，首次揭示了酸浸法在实际实验室测定中的局限性，并推荐了海洋沉积物中有机/无机碳测定的替代方案。
Organic and inorganic carbon contents of marine sediments are important to reconstruct marine productivity, global carbon cycle, and climate change.A proper method to separate and determine organic and inorganic carbons is thus of great necessity.Although the best method is still disputable, the acid leaching method is widely used in many laboratories because of its ease-of-use and high accuracy.The results of the elemental analysis of sediment trap samples reveal that organic and inorganic carbon contents cannot be obtained using the acid leaching method, causing an infinitely amplified error when the carbon content of the decarbonated sample is 12%±1% according to a mathematical derivation.Acid fumigation and gasometric methods are used for comparison, which indicates that other methods can avoid this problem in organic carbon analysis.For the first time, this study uncovers the pitfalls of the acid leaching method, which limits the implication in practical laboratory measurement, and recommends alternative solutions of organic/inorganic carbon determination in marine sediments.