A CRITICAL-EVALUATION OF THE ANALYTICAL BLANK ASSOCIATED WITH DOC MEASUREMENTS BY HIGH-TEMPERATURE CATALYTIC-OXIDATION
A CRITICAL-EVALUATION OF THE ANALYTICAL BLANK ASSOCIATED WITH DOC MEASUREMENTS BY HIGH-TEMPERATURE CATALYTIC-OXIDATION
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DOI：
10.1016/0304-4203(93)90113-3
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发表时间：
1993-01-01
期刊：
影响因子：
3
通讯作者：
STROM, M
中科院分区：
文献类型：
--
作者：
BENNER, R;STROM, M
使用岛津 TOC 分析仪和几种类型的催化剂研究了高温催化氧化 (HTCO) 测量溶解有机碳 (DOC) 过程中产生的分析空白的来源、大小和变异性。坯料碳污染的主要来源是燃烧过程中的催化剂。 Shimadzu、Aldrich 和 Sumitomo 生产的镀铂氧化铝催化剂生产了大量的空白，随着催化剂用量的增加，空白降低到相当恒定的水平 (10-50 μM C)。 Shimadzu 的镀铂石英催化剂在相对较少的调节下产生了较低的空白（约 6 μM C），而燃烧（850 摄氏度）石英片则产生了较高的空白（约 19 muM C）。鉴于这些发现，显然应定期监测空白并在样品分析过程中加以考虑。
The sources, magnitudes and variability of analytical blanks produced during dissolved organic carbon (DOC) measurements by high-temperature catalytic oxidation (HTCO) were investigated using a Shimadzu TOC analyzer and several types of catalysts. The major source of carbon contamination contribution to the blank was derived from the catalyst during the combustion process. Platinized-alumina catalysts from Shimadzu, Aldrich and Sumitomo produced substantial blanks that decreased to fairly constant levels (10-50 muM C) with increasing usage of the catalyst. A platinized quartz catalyst from Shimadzu produced a lower blank (approximately 6 muM C) with relatively little conditioning, whereas combusted (850-degrees-C) quartz chips produced a higher blank (approximately 19 muM C). In light of these findings, it is apparent that the blank should be monitored on a regular basis and accounted for during the analysis of samples.