英语翻译成中文，不要工具翻译，专业名词及缩写可以不用翻译，在线等立马采纳

Sediment grab samples were collected by hand from the top 10–15 cm of the sediment and placed into plastic containers immediately with an airtight cover sealing. The samples were then taken to the lab within 2 h and cooled at 4 ◦C in a refrigerator.A particle size distribution of sediment was carried out by sieving
the sediment through the sieves ranging from the sizes of 14mmto 425m. The soil fraction that passed through the 425m sieve was further collected for particle size analysis using Malvern Microplus Mastersizer. The weight percentage of organic matter and carbonate content in sediment were estimated by the means of LOI (Loss On Ignition). The element contents of C and N were determined by CHNS/O Elementary Analyzer (PerkinElmer 2400 Series II). Physical and chemical properties of the sediments are summarized in Table 1.

沉淀物提取样本是从沉淀物顶部10-15cm处手工提取并直接存入配有空气密封盖的塑料容器中的。随后样品被在2小时之内送入实验室并在温度为4℃的冰箱中保存。通过尺寸为14mm到425m滤网对沉淀物进行了过滤得到了其粒径分布。通过了425m滤网的土壤成分被进一步收集用于进行Malvern Microplus Mastersizer粒径分析。沉淀物中的有机物质和碳合物的中质量比通过Lol手段得出。碳元素和氮元素的含量通过CHNS/O Elementary Analyzer进行确定。沉淀物的物理和化学特性总结在表1中。

全部手打，部分专业单词未翻译或不够准确，请核查。谢谢。

用手收集土壤的随机样本，选取土壤表层10-15厘米的土壤，并迅速装入塑料容器中，用密封塞塞好。样本需在2个小时内带到实验室，并保存在4摄氏度的冰箱里。用筛子进行筛选，将通过425m 的颗粒再收集起来进行粒度分析。有机物和碳酸盐含量通过LOI方式分析，C和N元素含量通过CHNS/O元素分析仪测试。土壤的物理和化学特性汇总在表格1中。 基本大意，供参考。