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《Acta Sedimentologica Sinica》 2007-05
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Pretreatment Method of Grain Size Measurement of Marine Sediments in Paleoenvironment Research

XIE Xin ZHENG Hong-bo CHEN Guo-cheng MEI Xi(State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092)  
To yield grain size results of marine sediments reflecting variation of paleoenvironment and paleoclimate without distortion,biogenic carbonate and opal in samples should be effectively removed while terrigenous component should be undamaged during pretreatment procedure before measurement.To find the appropriate pretreatment method,marine sediments from South China Sea were treated with different dosages of hydrochloric acid(10%) or acetic acid(25%) and different dosages of NaOH and Na2CO3,then organic element analyzer,silica-molybdenum blue colorimetry and ESEM were used to evaluate the effects combined with the results of grain size measurement.The synthetic outcomes reveal that both of hydrochloric acid and acetic acid can eliminate biogenic carbonate well,however,because even a few dosage of the former can destroy terrigenous mineral component,the latter should be adopted during pretreatment procedure owing to its lower acidity;a large dosage of Na2CO3 still can't eliminate biogenic opal effectively but only a few dosage of NaOH can work well,so the latter should be used with restricted dosage to avoid destroying mineral component.According to biogenic content in marine sediments from SCS,the quantities of acetic acid(25%) and NaOH were determined and pretreatment procedure was established.
【Fund】: 科技部“中荷科技联盟”项目(批准号:2004CB720506);; 国家自然科学基金(批准号:40676033);; 中国博士后科学基金(批准号:20060390162);; 同济大学理科科技发展基金联合资助
【CateGory Index】: P736.2
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