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

发布时间：2019-01-11 15:40

【摘要】：海水中的颗粒有机碳(POC)是联系海洋生命与非生命过程最重要的参数之一,其在全球碳循环的作用异常重要,准确获取海水中颗粒有机碳的含量是揭示其重要作用的前提。目前,元素分析仪测定POC是其准确测定最常用的方法,但元素分析仪分析海水中颗粒有机碳过滤的膜样时,存在包样困难、滤膜对反应管损坏严重、灰分难以清理等问题,严重影响仪器的正常使用。本文采用总有机碳分析仪固体进样装置建立了海水中颗粒有机碳的分析方法,优化了样品前处理过程,对玻璃纤维膜进行了空白校正,考察了酸化方式和时间对测定结果的影响,方法检出限为CL(C)=0.019%。对青岛近海三个不同采样站位海水样品POC的测定结果相对标准偏差(RSD)为0.95%~2.66%(n=12),结果重复性好,精密度高,经国家标准样品水系沉积物GDS-9验证,结果与标准值符合,表明方法准确可靠,能满足海水中的颗粒有机碳(POC)的准确测定要求。所建立的方法完全克服了常规元素分析仪测定POC的弊端,同时降低了仪器的维护成本。
[Abstract]:Particulate organic carbon (POC) in seawater is one of the most important parameters linking marine life and non-life processes. The role of particulate organic carbon (POC) in the global carbon cycle is extremely important. It is a prerequisite to reveal its important role by accurately obtaining the content of particulate organic carbon in seawater. At present, determination of POC by elemental analyzer is the most commonly used method. However, when analyzing membrane samples of particulate organic carbon filtration in seawater by elemental analyser, it is difficult to package samples, and the filter membrane has serious damage to reaction tubes, and ash is difficult to be cleaned up. Seriously affect the normal use of the instrument. In this paper, the analytical method of particulate organic carbon in seawater has been established by using the solid sampling device of total organic carbon analyzer, the pretreatment process of the sample has been optimized, and the blank correction of glass fiber membrane has been carried out. The effect of acidizing method and time on the determination results was investigated. The detection limit of the method was CL (C) = 0.019. The relative standard deviation (RSD) of POC of seawater samples from three different sampling stations in the coastal waters of Qingdao is 0.950.66% (nnt12). The results are reproducible and have high precision. The results are verified by GDS-9 of the national standard samples. The results were in agreement with the standard values and showed that the method was accurate and reliable and could meet the requirements for the accurate determination of particulate organic carbon (POC) in seawater. The established method overcomes the disadvantages of conventional elemental analyzer for the determination of POC and reduces the maintenance cost of the instrument.
【作者单位】：中国科学院海洋研究所;
【基金】：中国科学院仪器设备功能开发技术创新项目(yg2012055)~~
【分类号】：P734.4

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