| A CRITICAL-EVALUATION OF THE ANALYTICAL BLANK ASSOCIATED WITH DOC MEASUREMENTS BY HIGH-TEMPERATURE CATALYTIC-OXIDATION |
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| Author(s): BENNER R, STROM M |
| Source: MARINE CHEMISTRY Volume: 41 Issue: 1-3 Pages: 153-160 Published: JAN 1993 |
| Times Cited: 196 References: 7 |
| Abstract: 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. |
| Document Type: Proceedings Paper |
| Language: English |
| Reprint Address: BENNER, R (reprint author), UNIV TEXAS, INST MARINE SCI, PORT ARANSAS, TX 78373 USA |
| Publisher: ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS |
| Subject Category: Chemistry, Multidisciplinary; Oceanography |
| IDS Number: KQ622 |
| ISSN: 0304-4203 |