(Table 1) River sediment elemental composition
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Where no <63 µm fraction is presenet, there was no material at this size fraction.
若不存在粒径小于63微米的粒级(<63 µm fraction),则该粒度级分中无任何物质。

Where no <63 µm fraction is presenet, there was no material at this size fraction.
若不存在粒径小于63微米的粒级(<63 µm fraction),则该粒度级分中无任何物质。