查询词典 dithionite

Geochemical analyses include 'total'(concentrated HNO3 -HCl digestion) and chemical forms (three step sequential digestion, reducible, oxidizable and residual forms) of heavy metals Cu, Zn, Pb, Cr,Fe and Mn, iron oxides dithionite-citrate-bicarbonate (DCB and ammonium in the dark extraction as the estimation of total and amorphous iron oxides, respectively, total sulfur and organic matter.

化学分析包括重金属（Cu、Zn、Pb、Cr和Fe、Mn）"总量"（浓HNO3、HCl提取，非严格的总量）、形态（三步提取法，可还原态、可氧化态和残渣态）、氧化铁（连二亚硫酸钠－柠檬酸钠－重碳酸钠提取和草酸铵提取分别估计总氧化铁和无定形氧化铁）、总硫和有机质，并比较了DCB提取前后样品磁性特征的变化。

Sodium Hydrosulphite; Sodium Dithionite

低亚硫酸钠；连二亚硫酸钠

Compared with the control, the percentages of living microorganisms on the biomembrane were 27.6, 14.1 and 0.01, respectively, after extracted by hydroxylamine hydrochloride （0.01mol·L^-1 NH2OH·HCl ＋ 0.01mol·L^-1 HNO3 ）, sodium dithionite （ 0.4mol·L^-1 Na2S2O4, pH 6.0 ）, and acidified ammonium oxalate.

经0.01mol·L^-1 NH2OH·HCl＋0.01mol·L^-1 HNO3、0.4mol·L^-1 Na2S2O4（pH6.0）和0.2mol·L^-1草酸氨（pH4.0）萃取后存活的微生物总量分别下降到原膜的27.6％、14.1％和0.01％；经15％HNO3萃取后，膜上只有极少数的细菌存活；而经H2O2／HNO3萃取后则无细菌存活、原生动物和藻类存活，说明选择性化学萃取剂的使用影响生物膜的活性。

In this paper, a total of 56 relatively nonpoint source pollution sediment samples were collected from the tidal flats of the Jiuduansha shoal and the Chongming island of the Yangtze river estuary. The main properties i. e., grain size distribution, contents of DCB (dithionite citrate bicarbonate extracted iron Fe(subscript d, AAO extracted iron Fe(subscript o, total Fe, DCB extracted Mn Mn(subscript d, total Mn, organic matter, magnetic susceptibility of the samples, as well as the concentrations of Cu, Zn, Pb, Cr, Cd and Ni in the samples, were determined. Basing on the data, the relation of the sediment properties to heavy metal concentrations was evaluated with pearson's rank and partial rank correlation analysis.

采集长江口无明显点源污染的崇明东滩和九段沙潮滩56个沉积物样品，测定沉积物原样和粘粒中Cu，Zn，Pb，Cr，Cd和Ni的含量以及沉积物的主要性状（粒径分布、游离铁、活性铁、总铁、游离锰、总锰、有机碳和磁化率等），以相关分析和偏相关分析研究沉积物中重金属含量与沉积物主要性质之间的关系。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。