| 摘要: |
| 1997年5月在莱州湾、1997年7月在东海、1997年11月在胶州湾采集了海水样品，用高温燃烧法测定了这些水样中的溶解有机碳（DOC）浓度，讨论了系统空白和标准曲线的选择对高温燃烧法测定结果的影响，并与紫外／过硫酸钾法的测定结果进行了比较。在准确测定和校正系统空白的条件下，用高温燃烧法对东海、莱州湾和胶州湾水样DOC的测定结果与紫外／过硫酸钾法基本相同。 |
| 关键词: 溶解有机碳 测定 高温燃烧法 紫外／过硫酸钾法 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，49606074号 |
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| HTC METHOD FOR DISSOLVED ORGANIC CARBON ANALYSIS IN SEAWATER |
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WANG Jiang-tao,ZHAO Wei-hong,TAN Li-ju
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1.College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao, 266003;2.Institute of Oceanology, The Chinese Academy of Sciences,Qingdao, 266071
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| Abstract: |
| Seawater samples were collected from the East China Sea (in July 1997), Laizhou Bay (in May 1997) and Jiaozhou Bay (in November 1997) and dissolved organic carbon (DOC) were determined by the high-temperature combustion method (HTC). The influence of estimation of system blank and choice of calibration curve on determined DOC values by HTC was discussed. The derived DOC values were compared with the values obtained by the UV/persulphate method. The instrument blank of HTC could be determined by two methods. One is by injecting ultra-pure water of different volumes into a combustion tube. The instrument blank was obtained by extrapolating injecting volumes to zero. This method might underestimate the instrument blank. The TOC 5000A Analyzer can use another method, internal cycling method, to determine instrument blank. This method was used in this study. The system blank was very high in HTC method if the catalyst was not pretreated. 34 samples in the East China Sea, Laizhou Bay and Jiaozhou Bay were determined by the HTC method and the UV/persulphate method after the instrument blank was carefully determined. The highest deviation between the two methods was 0.21 mg/L. For most samples the difference of determined values between the two methods was less than 0.10 mg/L. Statistical calculation shows that there was no system error between the two methods. It was the same after the blank was well estimated and a correction was made. |
| Key words: DOC, Determination, HTC method, UV/persulphate method |
