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山东省降雨和降雪中溶解有机碳、溶解无机碳和总氮的浓度变化及来源分析

ISSN号：0253-2468
期刊名称：《环境科学学报》
时间：0
分类：P[天文地球]
作者机构：[1]Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, P. R. China, [2]Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, P. R. China
相关基金：Financial support for this work was provided by Ocean University of China（841312004）; National Natural Science Foundation of China（Grant Nos.41476057 and 41221004）

作者：徐彩丽[1], 罗春乐, 薛跃君[1], 葛田田[1], 王旭晨[1,2]

关键词： radiocarbon, dissolved, ORGANIC, carbon, UV-oxidation, NATURAL, WATERS, AMS, radiocarbon, dissolved organic carbon, UV-oxidation, natural waters, AMS

中文摘要：

Radiocarbon（14C） measurement of dissolved organic carbon（DOC） is a very powerful tool to study the sources, transformation and cycling of carbon in the ocean. The technique, however, remains great challenges for complete and successful oxidation of sufficient DOC with low blanks for high precision carbon isotopic ratio analysis, largely due to the overwhelming proportion of salts and low DOC concentrations in the ocean. In this paper, we report an effective UV-Oxidation method for oxidizing DOC in natural waters for radiocarbon analysis by accelerator mass spectrometry（AMS）. The UV-oxidation system and method show 95%± 4% oxidation efficiency and high reproducibility for DOC in both river and seawater samples. The blanks associated with the method was also low（about 3 μg C） that is critical for 14 C analysis. As a great advantage of the method, multiple water samples can be oxidized at the same time so it reduces the sample processing time substantially compared with other UV-oxidation method currently being used in other laboratories. We have used the system and method for 14 C studies of DOC in rivers, estuaries, and oceanic environments and have received promise results.

英文摘要：

Radiocarbon (C-14) measurement of dissolved organic carbon (DOC) is a very powerful tool to study the sources, transformation and cycling of carbon in the ocean. The technique, however, remains great challenges for complete and successful oxidation of sufficient DOC with low blanks for high precision carbon isotopic ratio analysis, largely due to the overwhelming proportion of salts and low DOC concentrations in the ocean. In this paper, we report an effective UV-Oxidation method for oxidizing DOC in natural waters for radiocarbon analysis by accelerator mass spectrometry (AMS). The UV-oxidation system and method show 95%+/- 4% oxidation efficiency and high reproducibility for DOC in both river and seawater samples. The blanks associated with the method was also low (about 3 A mu g C) that is critical for C-14 analysis. As a great advantage of the method, multiple water samples can be oxidized at the same time so it reduces the sample processing time substantially compared with other UV-oxidation method currently being used in other laboratories. We have used the system and method for C-14 studies of DOC in rivers, estuaries, and oceanic environments and have received promise results.