Abstract

A combination of laser diffraction and wet sieving through a nylon screen with a 0.1-mm mesh has been suggested for the particle-size analysis of silty bottom sediments from estuarine and coastal sea areas. The necessity of individual determination of sand fractions even in case of the technical ability of the device to analyze the content of coarse particles to 2 mm in size is shown. This is related to poor sorting of coastal silts and inadequately represented weighed samples used for the standard laser diffraction particle-size analysis. In addition to sand fractions, the pre-sieving affects the determination of the 0.1–0.01 mm silt fractions, while its impact on the analysis of pelite fractions of less than 0.01 mm is minimal. The effectiveness of the proposed modified method is proved by the closer correlation between the content of pelite fractions and the concentration of metals and organic carbon in bottom sediments.

中文翻译：

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现代底部沉积物的激光衍射和筛分法粒度分析

摘要

有人建议将激光衍射和湿筛通过0.1毫米筛孔的尼龙筛网相结合，用于分析河口和沿海海域粉质底部沉积物的粒度。显示了即使在设备分析尺寸为2 mm的粗颗粒含量的技术能力的情况下，也需要单独确定砂分数的必要性。这与沿海淤泥的分类不良以及用于标准激光衍射粒度分析的称量样品不足有关。除砂级分外，预筛分还会影响0.1-0.01 mm粉砂级分的确定，而对小于0.01 mm的硬岩级分分析的影响极小。