CONDENSED-PHASE CARBON ISOTOPIC STANDARDS FOR COMPOUND-SPECIFIC ISOTOPE ANALYSIS

被引：21

作者：

CAIMI, RJ ^{[1
]}

HOUGHTON, LA ^{[1
]}

BRENNA, JT ^{[1
]}

机构：

[1] CORNELL UNIV,DIV NUTR SCI,ITHACA,NY 14853

来源：

ANALYTICAL CHEMISTRY | 1994年 / 66卷 / 18期

关键词：

D O I：

10.1021/ac00090a030

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A protocol has been developed for the preparation of isotopically characterized internal standards for compound-specific isotope analysis. Fatty acids and their corresponding methyl esters are loaded into flame seal vials by a protocol carefully designed to minimize isotopic fractionation and contamination. Carbon isotope analysis of randomly selected vials yields isotopic precision with an average standard deviation of 0.09 parts per thousand (delta(13)C(PDB)). Absolute values for carbon isotope ratios are determined against an international standard (NIST RM8541: USGS24). The procedure is general and may be used for all compounds soluble in volatile solvents. The fatty acid and fatty acid methyl esters standards developed here will be useful for day-to-day quality control and assessment of derivative carbon addition due to methylation of fatty acids.

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页码：2989 / 2991

页数：3

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