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1)  sequential chemical extract
逐级化学提取
1.
The occurrence of hazardous elements such as Hg,Ni,Zn,Mn,Cr,and V in Heshan high organosulfur coal formed in sedimentary environment of restricted carbonate platform was studied using sequential chemical extract.
采用逐级化学提取方法,研究了广西合山超高有机硫煤中Hg,Ni,Zn,Mn,Cr,V等有害元素赋存状态。
2.
The occurrence of trace arsenic in two bituminous coals and three anthracite coals was investigated using five step sequential chemical extract method.
应用5步法逐级化学提取研究了2个烟煤和3个无烟煤样品中微量As(0。
3.
The sequential chemical extraction method is put forward to determine the occurrence modes of chlorine in coal.
评述了煤中氯的研究现状,用仪器中子活化分析方法测定了中国45个晚古生代全层煤样氯的质量分数,提出了煤中氯的逐级化学提取方法。
2)  sequential chemical extraction
逐级化学提取
1.
The partitioning of several metal elements in lignites from Xilinguole League was investigated using five-step sequential chemical extraction procedures.
应用 5步逐级化学提取研究了褐煤中多种金属元素的存在形态 ,并用电感耦合等离子体原子发射光谱 (ICP OES )法测定了整个提取过程中金属元素的浓度 ,结果表明 ,应用 5步逐级化学提取法可以有效地定量研究褐煤中金属元素的形态分布 。
2.
Experimental results demonstrate that sequential chemical extraction procedure is efficient in determining the speciation of trace elements in coal quantitatively.
应用逐级化学提取法对3种典型煤进行浸提,根据易挥发痕量元素不同形态的溶解度,将煤中砷、汞、硒分为可交换态、硫化物结合态、有机物结合态和残渣态。
3)  sequential extraction
逐级提取
1.
This article summarizes the current common research methods of element speciation, and introduces the development of sequential extraction (SEE) technology and its applications to sediment and soil element speciation studies.
概述了元素形态的研究方法,介绍了SEE技术及其在沉积物、土壤元素形态研究中的应用,并就该技术在元素形态研究中的作用、实现标准化的可能性及难度、未来发展趋势等问题进行了探讨,得出了以下三点认识:(1)SEE技术是目前沉积物、土壤元素形态研究的必要手段,但其在未来元素形态研究中的作用,在很大程度上取决于技术本身的标准化和新发展以及其它形态分析方法的发展;(2)根据研究目的,系统研究不同样品的采集和预处理方法、试剂种类和浓度以及操作条件等元素形态影响因素,对现有流程进行改进或提出新的更合理的流程,作为SEE技术的标准流程,是必要且可能的,但其任务也是艰巨的;(3)SEE技术可能向两个趋势发展,分别形成微波加热-连续流-逐级提取(MCSE)技术以及微波加热-超声波震荡-动力学-平行提取(MUKPE)技术。
2.
Cadmium in standard soil sample (first order of China), polluted soil and non polluted soil are extracted with the designed six sequential extraction produre and A.
用笔者设计的六级提取程序与 A·Tessier五级提取程序,对国家一级标准土样和自采的污染土样及非染土样进行了镉的逐级提取对比研究,取得了进展。
3.
A method for determination of trace thallium in sequential extraction solution with complicated matrix and from two kinds of sulfuric acid slags by activated carbon adsorption-differential pulse anodic stripping voltammetry was studied.
研究了活性炭吸附-差示脉冲阳极溶出伏安法测定复杂基体(二种硫酸渣逐级提取液)中痕量铊的方法。
4)  sequential extraction procedure
逐级提取流程
1.
One five-stage sequential extraction procedure has been applied for element composition and species in coal fly ash, indoor aerosol, outdoor aerosol, and aerosol supplied by International Atomic Energy Agency (IAEA).
应用化学逐级提取流程对国际原子能机构(简称IAEA)气溶胶、室内和室外气溶胶、煤飞灰中元素的组成和化学种态进行了分析,应用仪器中子活化法测定了各种态中元素的含量,计算出元素在各种态中的分配比例。
5)  step by step concentration
逐级提浓
6)  electrochemical extraction
电化学提取
补充资料:逐级水解
分子式:
CAS号:

性质:多元弱酸或高价金属离子生成的盐水解时常分步进行,叫做逐级水解。如PO43-的水解就分三步,逐步生成HPO42-,H2PO4-,H3PO4及OH-。又如[Fe(H2O)6]3+的水解也是逐级生成[Fe(H2O)5OH]2+,[Fe(H2O)4(OH)2]+,Fe(OH)3及H3O+。通常第一级水解的倾向性要远大于后续级的。

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