| Ling Chen,Liu Zhifei,Zhang Jingwen,Zhao Yulong,Zhang Yanwei,Fernandez Adrian R.. 2020. Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments. Acta Oceanologica Sinica, 39(8):96－102 |
| Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments |
| 酸洗法测定海洋沉积物有机碳和无机碳含量的致命缺陷 |
| Received:December 13, 2019 |
| DOI：10.1007/s13131-020-1631-z |
| Key words:marine sediments organic carbon inorganic carbon acid leaching method limitation |
| 中文关键词: 海洋沉积物 有机碳 无机碳 酸洗法 局限性 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41530964, 41776047, 41876048 and 91528304. |
| Author Name | Affiliation | E-mail | | Ling Chen | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Liu Zhifei | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | lzhifei@tongji.edu.cn | | Zhang Jingwen | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Zhao Yulong | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Zhang Yanwei | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Fernandez Adrian R. | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | |
|
| Hits: 1506 |
| Download times: 716 |
| 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. |
| 中文摘要: |
| 海洋沉积物中有机碳和无机碳含量是反映海洋生产力强弱、记录全球碳循环和气候变化的重要指标，准确分离和测定样品中的有机碳、无机碳是开展海洋科学研究的基础。虽然对于最佳分析方法仍有争议，但酸洗法由于操作简便、测试精度高，在许多实验室得到广泛应用。然而，本文通过对沉积物捕集器样品进行测试分析，并对酸洗法的计算原理进行数学推导表明，当酸处理后样品的碳含量为12%±1%时，这种分析方法将导致误差被无限放大，从而无法获得样品准确的有机碳和无机碳含量。采用酸蒸法和气体定量法进行的对比分析表明，使用其他方法可以避免在有机碳分析中出现这一问题。本研究首次揭示了酸洗法长期以来不为人知的局限性，这一致命缺陷限制了其在实际测试中的广泛应用，并对海洋沉积物的有机/无机碳含量测定提出了其他解决方案。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
