纠正自然水体中有机碳污染评估的一个重大错误。
Correcting a major error in assessing organic carbon pollution in natural waters.
作者信息
Jiao Nianzhi, Liu Jihua, Edwards Bethanie, Lv Zongqing, Cai Ruanhong, Liu Yongqin, Xiao Xilin, Wang Jianning, Jiao Fanglue, Wang Rui, Huang Xingyu, Guo Bixi, Sun Jia, Zhang Rui, Zhang Yao, Tang Kai, Zheng Qiang, Azam Farooq, Batt John, Cai Wei-Jun, He Chen, Herndl Gerhard J, Hill Paul, Hutchins David, LaRoche Julie, Lewis Marlon, MacIntyre Hugh, Polimene Luca, Robinson Carol, Shi Quan, Suttle Curtis A, Thomas Helmuth, Wallace Douglas, Legendre Louis
机构信息
State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences, Fujian Key Laboratory of Marine Carbon Sequestration, Xiamen University, Xiamen 361005, China.
Joint Laboratory for Ocean Research and Education at Dalhousie University, Shandong University and Xiamen University, Halifax, NS, B3H 4R2, Canada, Qingdao 266237, China, and Xiamen 361005, China.
出版信息
Sci Adv. 2021 Apr 14;7(16). doi: 10.1126/sciadv.abc7318. Print 2021 Apr.
Microbial degradation of dissolved organic carbon (DOC) in aquatic environments can cause oxygen depletion, water acidification, and CO emissions. These problems are caused by labile DOC (LDOC) and not refractory DOC (RDOC) that resists degradation and is thus a carbon sink. For nearly a century, chemical oxygen demand (COD) has been widely used for assessment of organic pollution in aquatic systems. Here, we show through a multicountry survey and experimental studies that COD is not an appropriate proxy of microbial degradability of organic matter because it oxidizes both LDOC and RDOC, and the latter contributes up to 90% of DOC in high-latitude forested areas. Hence, COD measurements do not provide appropriate scientific information on organic pollution in natural waters and can mislead environmental policies. We propose the replacement of the COD method with an optode-based biological oxygen demand method to accurately and efficiently assess organic pollution in natural aquatic environments.
水生环境中溶解有机碳（DOC）的微生物降解会导致氧气消耗、水体酸化和二氧化碳排放。这些问题是由易降解溶解有机碳（LDOC）而非难降解溶解有机碳（RDOC）引起的，RDOC 抗降解，因此是一个碳汇。近一个世纪以来，化学需氧量（COD）一直被广泛用于评估水生系统中的有机污染。在此，我们通过一项多国调查和实验研究表明，COD 并非衡量有机物微生物可降解性的合适指标，因为它会同时氧化 LDOC 和 RDOC，而在高纬度森林地区，后者在 DOC 中所占比例高达 90%。因此，COD 测量无法提供有关天然水体中有机污染的恰当科学信息，还可能误导环境政策。我们建议用基于光极的生物需氧量法取代 COD 法，以准确、高效地评估天然水生环境中的有机污染。
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