海洋地质与第四纪地质2012，Vol.32Issue(2)：161-167,7.DOI:10.3724/SP.J.1140.2012.02161
不同前处理方法对南方红土粒度测量的影响——以安徽宣城第四纪红土剖面为例
INFLUENCE OF PRETREATMENTS ON GRAIN-SIZE DISTRIBUTION OF THE RED EARTH IN SOUTHERN CHINA——A CASE STUDY ON THE QUATERNARY RED EARTH PROFILE IN XUANCHENG, ANHUI PROVINCE
摘要
Abstract
Taking the Quaternary red earth profile in Xuancheng as an example, we studied the influence of different pretreatment methods on grain size distribution of the red earth in southern China, The results indicate that: (1) The southern red earth contain a little amount of organic matter, which will influence the grain size distribution, so it's necessary to use hydrogen peroxide (H2O2) to remove the organic matter during the pretreatment. (2) Due to the strong leaching, carbonate content in red earth is extremely low, which has no effect on the result of measurement. So it doesn't need to add hydrochloric acid (HC1) to remove carbonate. The input of HC1 may lead to flocculation, which will make the results coarser. (3) Compared with sodium hexametaphosphate ((NaPO3)6),sodium hydroxide(NaOH) leads to an abnormal shape of grain size frequency curves, and the decrease in grain content of size <1 μm, so NaOH is not an appropriate dispersant agent for the red earth. (4) According to the experiment, we find the pretreatment method of (H2O2 + (NaPO3)6) is the best. It is recommended using H2O2 to remove organic matter, and (NaPO3)6 as a dispersant, finally dispersing the sample by ultrasonic cleaning instrument.关键词
南方红土/粒度测量/前处理方法/分散剂/安徽宣城Key words
Red earth/ grain size/ pretreatment methods/ dispersant/ Xuancheng/ Anhui分类
天文与地球科学引用本文复制引用
刘海丽,韩志勇,李徐生,房迎三..不同前处理方法对南方红土粒度测量的影响——以安徽宣城第四纪红土剖面为例[J].海洋地质与第四纪地质,2012,32(2):161-167,7.基金项目
国家自然科学基金项目(40971004,40930103) （40971004,40930103）
国家文物局文化遗产保护科技研究项目(2009011) （2009011）
