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Isotopes Environ Health Stud

Title:		Microcombustion of ng Amounts of Carbon in Non-Volatile Materials for isotope Ratio Evaluation
Author(s):		Hofmann D; Brand WA;
Address:		"a UFZ - Umweltforschungszentrum Leipzig - Halle GmbH , Leipzig"
Journal Title:		Isotopes Environ Health Stud
Year:		1996
Volume:		32
Issue:		2-Mar
Page Number:		255 - 262
DOI:		10.1080/10256019608036318
ISSN/ISBN:		1025-6016 (Print) 1025-6016 (Linking)
Abstract:		"Abstract A novel microcombustion technique for carbon isotopic analysis of nanogram amounts of carbon in non-volatile materials based on isotope ratio monitoring (irm) mass spectrometry is described. Liquid or solid samples placed in a quartz sleeve are combusted at 1000 degrees C in a continuous stream of helium and oxygen. CO(2) removed from the carrier gas stream by cryogenic trapping is transferred onto a GC column. Following GC separation, the CO(2) is transferred via an open split to the ion source of a gas isotope ratio mass spectrometer. Reproducibility for samples >25 nmol carbon is <1 per thousand. Problems associated with blanks from various sources and with reproducible deposition of small sample amounts led to variable accuracy, which was dependent on the compound class being analysed. Minimum sample size was in the range from 5 to 10 nmol carbon. Measurements of dissolved organic carbon (DOC) of groundwater from Germany yielded consistent values of delta(13)C = -28.8 per thousand"
Keywords:
Notes:		"PubMed-not-MEDLINEHofmann, D Brand, W A eng England 1996/08/01 Isotopes Environ Health Stud. 1996 Aug; 32(2-3):255-62. doi: 10.1080/10256019608036318"