| PENG Yajun,LIU Dongyan,WANG Yujue,RICHARD Pierre,KEESING John K..Analyzing biases of nitrogen contents and δ15N values arising from acidified marine sediments with different CaCO3 concentrations[J].Acta Oceanologica Sinica,2018,37(8):1-5 |
| 酸化过程对不同碳酸钙含量的海洋沉积物中总氮及其同位素分析的影响 |
| Analyzing biases of nitrogen contents and δ15N values arising from acidified marine sediments with different CaCO3 concentrations |
| 投稿时间：2017-05-26 修订日期：2017-08-30 |
| DOI：10.1007/s13131-018-1188-2 |
| 中文关键词: 氮稳定同位素 总氮 CaCO3 酸化 海洋沉积物 |
| 英文关键词:stable isotope nitrogen nitrogen CaCO3 acidification marine sediment |
| 基金项目:The National Natural Science Foundation of China under contract No. 41376121; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11020405; the Natural Science Foundation of Shandong Province under contract No. JQ201414; the Program of Advanced Talents of The Guizhou University of Finance and Economics, 2016. |
| 作者 | 单位 | E-mail | | 彭亚君 | 中国科学院烟台海岸带研究所, 海岸带环境过程与生态修复重点实验室, 中国, 烟台 264003
贵州财经大学, 管科学院, 中国, 贵阳 550000 | | | 刘东艳 | 中国科学院烟台海岸带研究所, 海岸带环境过程与生态修复重点实验室, 中国, 烟台 264003
华东师范大学, 河口海岸国家重点实验室, 中国, 上海 200062 | dyliu@sklec.ecnu.edu.cn | | 王玉珏 | 中国科学院烟台海岸带研究所, 海岸带环境过程与生态修复重点实验室, 中国, 烟台 264003 | | | RICHARD Pierre | 拉罗谢尔大学, 海岸、环境与社会研究所, 法国, 拉罗谢尔 17000 | | | KEESING John K. | 西澳大利亚大学, 海洋研究所与印度洋研究中心, 澳大利亚, 克劳利 6009 | |
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| 中文摘要: |
| 为节约成本和样品，一些学者同时分析海洋沉积物中的碳、氮及其同位素（TOC、TN、δ13C和δ15N）。分析沉积物中的δ13C，需要对样品进行酸化去除无机碳，但是这一酸化过程会使TN和δ15N的分析结果产生偏差，且偏差范围与沉积物中无机碳含量（CaCO3）有关。本研究选取了低CaCO3含量（1-16%）和高CaCO3含量（20-40%）的海洋沉积物样品，比较了酸化过程对TN和δ15N的影响。研究结果表明，酸化过程对海洋沉积物中TN和δ15N的分析结果产生了显著影响。对于低CaCO3含量的样品，酸化导致样品中TN流失了约0-40%，δ15N偏移了约0-2‰；而对于高CaCO3含量的样品，酸化导致样品中TN流失了约10-60%，δ15N偏移了约1-14‰。表明酸化对TN和δ15N的影响已经超过了仪器的误差范围0.002%（TN）和0.08‰（δ15N），将影响TN和δ15N的环境指示意义。因此，即使海洋沉积物样品中CaCO3含量很低，也必须用原样分析TN和δ15N以避免酸化过程的影响。 |
| 英文摘要: |
| In some studies, the researchers pretreated and measured organic carbon, nitrogen and their isotopes (δ13C and δ15N) of marine sediment together, to save costs and resources of analysis. However, the procedure of acidification to remove inorganic carbon for analysing δ13C can affect the values of nitrogen and δ15N, and the biases vary a lot depending on the CaCO3 contents of sediments. In this study, the biases of total nitrogen (TN) and δ15N values arising from acidified sediments were compared between the CaCO3-poor (1%-16%) and CaCO3-rich (20%-40%) samples. TN and δ15N values were altered during acid treatment (without centrifugation) that possibly led to N-containing compounds volatilization. For CaCO3-poor samples, acidification led to a range of 0%-40% TN losses and 0‰-2‰ shift in δ15N values; and 10%-60% TN losses and 1‰-14‰ shift in δ15N values for CaCO3-rich samples. The biases from most samples exceeded the precision of the instrument (0.002% for TN and 0.08‰ for δ15N), and high biases could mislead our judgment for the environmental implication of the data. Thus, avoiding co-analysis of organic carbon, nitrogen and their isotopes (δ13C and δ15N) in sediments, even for CaCO3-poor marine sediments, is necessary. |
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