海洋科学2017，Vol.41Issue(7)：59-63,5.DOI:10.11759/hykx20161018002
固体进样——总有机碳分析仪法直接测定海水中的颗粒有机碳
Solid sampling—Determination of particulate organic carbon in seawater by total organic carbon analyzer
摘要
Abstract
Particulate organic carbon in seawater (POC) is one of the most important parameters in both living and non-living marine processes. As a critical factor in the global carbon cycle, obtaining accurate POC contents is a fundamental requirement for assessing its important role. The elemental analyzer is the most commonly used method for accurately determining POC, but it has a number of limitations, such as difficulty with sample packag-ing, damage to the reaction tube by the membrane, and difficulty in cleaning up the ash, all of which seriously affect routine use of the instrument. In this paper, we propose a novel analytical method for determining POC using the solid sampling device of the total organic carbon analyzer, which optimizes the sample pretreatment process and corrects the glass fiber membrane blank. We investigated the effects of acidification mode and time on the POC determination results and found the detection limit of this method to be CL(C) = 0.019%. The relative standard de-viations (RSDs) of three POC samples taken from different sampling stations in Qingdao coastal seawater ranged between 0.95–2.66% (n = 12). Along with its good repeatability and high precision, the POC results accord with the standard values of the GDS-9 validation of the national standard sample stream sediments. Our proposed method completely overcomes the disadvantages of the conventional elemental analyzer for POC determination and reduces instrument maintenance costs.关键词
固体进样模块/总有机碳分析仪/海水颗粒有机碳(POC)Key words
solid sampling device/total organic carbon analyzer/particulate organic carbon in seawater (POC)分类
海洋科学引用本文复制引用
孙萱,宋金明,温廷宇,李琛..固体进样——总有机碳分析仪法直接测定海水中的颗粒有机碳[J].海洋科学,2017,41(7):59-63,5.基金项目
中国科学院仪器设备功能开发技术创新项目(yg2012055) Technology Innovation Project of the Instrument and Equip-ment of the CAS, No. yg2015055 （yg2012055）
