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Assessing the saponification effect on the quantification of long chain alkenones and the U37K’ paleothermometer

Title
Assessing the saponification effect on the quantification of long chain alkenones and the U37K’ paleothermometer
Author
신경훈
Keywords
alkenones; U-37(K '); sea surface temperature; saponification; Yellow Sea
Issue Date
2018-12
Publisher
GEOCHEMICAL SOC JAPAN
Citation
GEOCHEMICAL JOURNAL, v. 52, No.. 6, Page. 497-507
Abstract
In this study, we evaluated the saponification effect on alkenone quantification and the U-37(K') paleothermometer using two internal standards (2-nonadecanone and squalane) by analyzing in-house reference sediment and eleven surface sediments taken from the Yellow Sea. The C-37:3 and C-37:2 alkenone concentrations of the in-house reference sediment showed significant differences between before and after the saponification (Delta C-37:3 and Delta C-37:2) depending on the internal standards used. However, the differences in the U-37(K') and the estimated sea surface temperatures were insignificant. The Delta C-37:3 and Delta C-37:2 concentrations were larger when calculating based on 2-nonadecanone (46 +/- 26 and 136 +/- 67 ng/g, respectively) than those based on squalane (-7 +/- 4 and -12 +/- 10 ng/g, respectively) in the surface sediments. Interestingly, the Delta C-37:3 and Delta C-37:2 concentrations based on 2-nonadecanone showed a strong correlation with the loss of 2-nonadecanone that occurred during saponification. Accordingly, our study indicated that preferential loss of internal standards (e.g., 2-nonadecanone) can occur during saponification, which affects alkenone quantification and, thus, attention should be paid when choosing an internal standard.
URI
https://www.jstage.jst.go.jp/article/geochemj/52/6/52_2.0538/_article/-char/ja/http://repository.hanyang.ac.kr/handle/20.500.11754/105805
ISSN
0016-7002
DOI
10.2343/geochemj.2.0538
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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