An experimental evaluation of cleaning methods for fossil ostracod Mg/Ca and Sr/Ca determination |
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Authors: | Zhangdong Jin Mike Bickle Hazel Chapman Jimin Yu Mervyn Greaves Sumin Wang Shiyue Chen |
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Institution: | (1) Key Laboratory of Lake Sedimentation and Environment, Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing, 210008, China;(2) Department of Earth Sciences, University of Cambridge, Cambridge, Downing Street, CB2 3EQ, United Kingdom |
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Abstract: | To evaluate the effect of sample preparation on the trace element composition of ostracod shells, fossil shells subjected to various cleaning steps were analyzed by ICP-AES. The variations in ostracod Mg/Ca ratios reveal that fossil ostracod samples cleaned by ultrasonic methanol yield lower values than those by other methods, including increasingly rigorous reductive cleaning. In our sample sets, shell Mg/Ca decreases ∼
∼1.5 mmol/mol during clay removal. Sample Sr/Ca results do not seem to vary significantly under the equivalent cleaning steps. For ostracod analysis, pre-treatment using multiple methanol ultrasonic cleaning is suggested to be used for gaining an appropriate result. |
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Keywords: | Ostracod Cleaning experiment Trace element ICP-AES |
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