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冉敬, 杜谷, 潘忠习. 沉积物粒度分析方法的比较[J]. 岩矿测试, 2011, 30(6): 669-676.
引用本文: 冉敬, 杜谷, 潘忠习. 沉积物粒度分析方法的比较[J]. 岩矿测试, 2011, 30(6): 669-676.
RAN Jing, DU Gu, PAN Zhong-xi. Study on Methods for Particle Size Analysis of Sediment Samples[J]. Rock and Mineral Analysis, 2011, 30(6): 669-676.
Citation: RAN Jing, DU Gu, PAN Zhong-xi. Study on Methods for Particle Size Analysis of Sediment Samples[J]. Rock and Mineral Analysis, 2011, 30(6): 669-676.

沉积物粒度分析方法的比较

Study on Methods for Particle Size Analysis of Sediment Samples

  • 摘要: 近年来激光粒度分析法在沉积物粒度分析方面的应用得到了进一步扩展。本文利用美国麦克奇公司生产的S3500型激光粒度分析仪开展沉积物粒度分析方法实验,研究表明:S3500型仪器较优的样品用量约为0.2 g;稀释过程会影响样品的粒度分布;样品分取方式会带来不同的随机误差。与薄片图像法和筛析法两种传统粒度分析方法获得的粒度分布参数比较表明:激光法测得的平均粒径较薄片图像法和筛析法偏细;激光法和筛析法的峰度相关性较好。采用Malvern 2000和Micro S3500两种激光粒度分析仪测量结果的比较表明:Malvern 2000测得的平均粒径较Micro S3500测得的平均粒径偏细,但二者的相关性很好(r=0.9574),研究认为这两种粒度仪的测试结果会给岩石粒度定名带来差异。由于各种粒度分析方法存在差异和局限性,在实际工作中粒度分析应尽可能建立在同一测量体系上,以便资料对比。

     

    Abstract: The applications of Laser particle size analysis in sediment fields have been developed in recent years. Some factors such as the weight of the sample and dilution affect the measurement result of laser particle size analysis. For Micro S3500, the optimum weight of a sample is about 0.2 grams. If diluted, it affects the result of the particle size distribution. The method of sampling causes different random errors. Compared to the particle size distribution parameters (average size, standard deviation, skewness and kurtosis), the results obtained by laser analyzer show a smaller average size than the image method and sieving method. However, a good correlation for kurtosis was observed between the laser method and sieving method. According to the measurement results of 30 samples with two types of laser size analyzers of Micro S3500 and Malvern 2000, the average size obtained by Micro S3500 was bigger than that by Malvern 2000 with a good linear correlation (r=0.9574). In summary, results from the two analyzers provided a systemic difference in grain size. There are limitations and differences between every size analysis method. The particle size data should be obtained and analyzed by the same method in order to compare data from different references.

     

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