4.3. Particle size distributions of SLW1 sediment cores

5 grams of sediment was crushed and dry-sieved to remove gravel (>2 mm). Depending on grain size of the sediment, 0.2 to 5 grams of sieved sample was transferred into a glass bottle with 0.5 ml 5% HMP solution and 30 ml deionized water. Sample was shaken for 8 hours prior to analysis. The dispersed sample was transferred to a Malvern Mastersizer 3000 laser diffraction particle size analyzer for particle size analysis.

称取5克沉积物样品，经粉碎后进行干筛以去除粒径大于2毫米的砾石。根据沉积物的粒径情况，称取0.2至5克过筛后的样品转移至玻璃瓶中，加入0.5毫升5%六偏磷酸钠（HMP）溶液与30毫升去离子水。将样品振摇8小时后进行粒度分析。将分散后的样品转移至马尔文（Malvern）Mastersizer 3000激光衍射粒度分析仪中开展粒径分析。