Journal
MARINE CHEMISTRY
Volume 118, Issue 1-2, Pages 85-97Publisher
ELSEVIER
DOI: 10.1016/j.marchem.2009.11.003
Keywords
Lignin; CuO oxidation; Dissolved organic matter; Tandem mass spectrometry; Lignin standards
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Funding
- Texas AM University
- NSF [ARC 0425582, ARC 0713991]
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A series of reference materials are proposed for intercomparison and quality control purposes during the quantification of lignin oxidation products (LOP) from diverse environmental matrices. These materials are all easily accessible and certified for diverse organic constituents (NIST and IHSS). They represent a suite of natural environmental matrices (from solids to aqueous) and are characterized by a wide range of organic carbon and lignin concentrations with abundant proportions of all major LOP. The variability of LOP concentrations and signatures for all these materials averages 3-5% and does not exceed 10%. Using these standards, a new quantification method was developed and validated for the determination of low-level CuO oxidation products using capillary gas chromatography-tandem mass spectrometry (GC/MS-MS). Tandem mass spectrometry provides both the high sensitivity and selectivity required for the identification and quantification of trace levels of dissolved lignin. The method is particularly useful for removing interference from co-eluting isotopes generated from the DOM matrix and during glucose amendment procedures of low-carbon samples. Such glucose amendment is not necessary, however, when the CuO to organic carbon weight-to-weight ratio can be kept at a value <200-300. (C) 2009 Elsevier B.V. All rights reserved.
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