期刊
MARINE ECOLOGY PROGRESS SERIES
卷 287, 期 -, 页码 251-253出版社
INTER-RESEARCH
DOI: 10.3354/meps287251
关键词
isotope signatures; carbonates; sample acidification
Enrichment of the stable isotopes C-13 and N-15 across trophic levels is a commonly used tool in studies on organic matter flow and food webs. However, there is still no accepted standard for pre-analysis sample preparation. Thus, potential methodological bias in single studies may hamper comparability and scalability of data from different sources. Sample CaCO3 content introduces a positive bias in delta C-13 measurements and a negative bias in delta N-15 measurements. The acidification of samples to remove inorganic carbonate significantly reduces both delta C-13 and delta N-15. As a standard procedure we recommend (1) acidifying samples with as little hydrochloric acid(HCl) as possible using the drop-by-drop technique, and (2) restraining from rinsing after HCl application.
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