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当前位置: 首页 > 文章 > 沉积物中炭屑对粒度分析结果的影响及预处理方法探讨 干旱区研究 2008,25 (3) 433-437
Position: Home > Articles > Study on the Influence of Charcoal-fragmental Deposit on the Analyzed Results of Grain Size and the Pretreatment Methods Arid Zone Research 2008,25 (3) 433-437

沉积物中炭屑对粒度分析结果的影响及预处理方法探讨

作  者：
张鹂;穆桂金
单  位：
中国科学院新疆生态与地理所
关键词：
沉积物;粒度分析;炭屑;预处理方法;克里雅河;新疆
摘  要：
通过采用3种不同预处理方法,对52个含炭屑样品进行粒度对比分析。结果表明:炭屑颗粒的混入会造成样品粒度分析结果的失真,具体表现在沉积物样品粗颗粒(>40μm)组分含量明显增加、样品各项粒度参数(平均粒径、中值粒径和偏度)显著增大,且随着炭屑含量的增加,去炭屑前后粒度参数的变化值呈规律性变化。综合理论和经验分析得出,当炭屑含量≥1.7%时,样品必须做炭屑预处理。基于本次实验样品的黄土性状(含黏粒少、分选好、颗粒细等),烧失法(F3)是一种值得推荐的去除炭屑较为彻底的预处理方法。
译  名：
Study on the Influence of Charcoal-fragmental Deposit on the Analyzed Results of Grain Size and the Pretreatment Methods
作  者：
ZHANG Li(1,2),MU Gui-jin1 (1.Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;2.Graduate School,Chinese Academy of Sciences,Beijing 10039,China)
关键词：
granular analysis;charcoal fragment;pretreatment.
摘  要：
Charcoal-fragmental deposit exists extensively in multiform sediments.In order to reveal the influence of charcoal-fragmental deposit on the analyzed results of grain size,52 charcoal-containing samples are pretreated with three different methods,and their grain sizes are compared and analyzed.The results reveal that charcoal can make a noticeable distortion of the analyzed results of grain size,that is the content of coarse grain(>40 μm) can be significantly increased,the granular parameters,such as the average grain size,median particle size and skewness,are obviously increased,and the granular parameters are regularly changed with the increase of charcoal content before and after demineralizing charcoal.After integrating the theoretical and empirical analysis results,it is derived that the samples must be pretreated when the charcoal content is ≥1.7%.It is considered that ignition-demineralizing method is ideal to demineralize charcoal from the loess samples because loess is characterized by low clay content,high sorted level,fine particles,etc.

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