沉积物理化指标测定

1、含水率

        The water content (WC) was obtained by measuring the weight loss  after the sediments were dried at 70 °C for 72 h until a constant weight  was attained. 通过测量沉积物在70°C下干燥72 h，直到达到恒定的重量后的重量损失，得到含水量（WC）[1]。

2、pH

        将沉积物风干并过2mm的筛网（网眼大小没有特定标准），称取一定量的土样并用蒸馏水浸提（水：土 = 2.5ml∶1g）[2-3]，用搅拌器搅拌1min使土粒充分分散，放置30min后用pH计测定pH值。

       a pH meter (IQ Scientific Instruments)[5]

3、电导率Electric conductivity(EC)

        使用电导率仪（DDSJ-308F，INESA，China）在沉积物：水 = 1g:5ml）条件下测量沉积物的电导率（EC）[4]。

       Soil electric conductivity (EC) were determined using a 2265FS EC meter (Spectrum Technologies Inc.)[5]

4、氧化还原点位ORP

[6-7]

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[1] Lee H , Heo Y M , Kwon S L ,et al.Environmental drivers affecting the bacterial community of intertidal sediments in the Yellow Sea[J].Science of The Total Environment, 2020, 755.

[2]杨雨虹,贺惠,米铁柱,等.耐盐碱水稻土壤产甲烷菌群落特征及产甲烷途径[J].环境科学, 2021, 42(7):10.

[3] Liao W , Tong D , Li Z ,et al.Characteristics of microbial community composition and its relationship with carbon, nitrogen and sulfur in sediments[J].Science of The Total Environment, 2021, 795:148848-.DOI:10.1016/j.scitotenv.2021.148848. 

[4] Li T, Chen Y, Wang Y, et al. Occurrence, source apportionment and risk assessment of perfluorinated compounds in sediments from the longest river in Asia[J]. Journal of Hazardous Materials, 2024, 467: 133608.

[5] Moderate salinity improves the availability of soil P by regulating P-cycling microbial communities in coastal wetlands

[6] Zhang W , Lei M , Li Y ,et al.Determination of vertical and horizontal assemblage drivers of bacterial community in a heavily polluted urban river[J].Water Research, 2019, 161.

[7] Sediment bacterial communities in a eutrophic lake influenced by multiple inflow-rivers