| 酸洗法测定海洋沉积物有机碳和无机碳含量的致命缺陷 |
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| 引用本文： | 凌晨,刘志飞,张靖雯,赵玉龙,张艳伟,Fernandez Adrian R..酸洗法测定海洋沉积物有机碳和无机碳含量的致命缺陷[J].海洋学报(英文版),2020,39(8):96-102. |
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| 作者姓名： | 凌晨 刘志飞 张靖雯 赵玉龙 张艳伟 Fernandez Adrian R. |
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| 作者单位： | 同济大学海洋地质国家重点实验室, 上海 200092 |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 41530964, 41776047, 41876048 and 91528304. |
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| 摘 要： | 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.
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| 关 键 词： | 海洋沉积物 有机碳 无机碳 酸洗法 局限性 |
| 收稿时间： | 2019/12/13 0:00:00 |
Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments |
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| Ling Chen,Liu Zhifei,Zhang Jingwen,Zhao Yulong,Zhang Yanwei,Fernandez Adrian R..Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments[J].Acta Oceanologica Sinica,2020,39(8):96-102. |
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| Authors: | Ling Chen Liu Zhifei Zhang Jingwen Zhao Yulong Zhang Yanwei Fernandez Adrian R |
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| Institution: | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
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| Abstract: | 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. |
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| Keywords: | marine sediments organic carbon inorganic carbon acid leaching method limitation |
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