Pretreatment Method of Grain Size Measurement of Marine Sediments in Paleoenvironment Research
Pretreatment Method of Grain Size Measurement of Marine Sediments in Paleoenvironment Research
复制标题
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Xi
中科院分区：
文献类型：
--
作者：
M. Xi
为使海洋沉积物粒度结果不失真地反映古环境和古气候变化，在测量前的预处理过程中，应在不破坏陆源组分的前提下，有效去除样品中的生物碳酸盐和蛋白石，寻找合适的预处理方法。采用不同浓度的盐酸（10%）和乙酸（25%）以及不同浓度的NaOH和Na 2CO 3对南海海洋沉积物进行处理，结果表明，盐酸和醋酸对生物碳酸盐的去除效果较好，但盐酸用量少，会破坏陆源矿物组分，在前处理工序中应采用酸性较低的酸性溶液;大剂量的Na 2CO 3仍不能有效去除生物蛋白石，而少量的NaOH就能很好地去除生物蛋白石，根据南海海洋沉积物中的生物含量，确定了25%乙酸和氢氧化钠的用量，确定了预处理工艺。
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.