1)  Sheltering Hg 2+ 、Bi 3+ 、Fe 3+ 、Au 3+
掩蔽Hg~(2+).Bi~(3+).Fe~(3+).Au~(3+)
2)  Masking
掩蔽
1.
Discussion on the Masking and Demasking Problem in Analytical Chemistry Teaching Materials of Pharmaceutical Engineering;
关于制药工程专业分析化学课程教学中掩蔽与解蔽问题的讨论
2.
A Reseach on Masking Method for S~(2-) in Basicity Determination of OH~- CO_3~(2-) and HCO_3~-;
OH~-、CO_3~(2-)和HCO_3~-碱度测定中S~(2-)的掩蔽方法研究
3.
A Diagnosis of Cochlear Hydrops Using ABR under Masking of Pink Noise;
粉红噪声掩蔽下的听性脑干反应诊断早期梅尼埃病
3)  shelter
掩蔽
1.
By means of sheltering the chief reductive substances in the total drain sludge one by one and analyzing the changes of COD before and after the shelters,the writer finds out the primary factors which influence the COD.
通过对总排污口污水中主要还原性物质逐项进行掩蔽 ,分析掩蔽前后污水COD值的变化 ,找出了影响COD的主要因素并提出了改进措施 ,使排污总口COD值大幅降
2.
The function of sheltering nitrite from sulfamic acid is compared with that from sodium azidum.
结果表明:海洋监测规范中COD的测定方法不适合于NO-2较高的污染海水,比较了氨基磺酸与叠氮化钠对NO-2的掩蔽效果及测定方法。
3.
And adopt active carbon pretreatment,EDTA complexing,NH_4F shelter and pH control resolve these unstabilizing factors.
采取了活性炭预处理、乙二胺四乙酸钠络合、氟化铵掩蔽和酸度控制等方法来解决不稳定性,并且与火法试金分析结果进行对照,结果相符,方法可行。
4)  masking agent
掩蔽剂
1.
To find out a method which not only shorten time,save money and decrease pollution,but also satisfy requirements for setting out chemical oxygen demand(COD),the CODs were quickly determined by mercury-free potassium dichromate method using MnSO4 as catalyst and AgNO3,KCr(SO4)2·12H2O as masking agent of Cl-in sulfuric-phosphoric mixed acid.
12H2O作Cl-的掩蔽剂,采用重铬酸钾氧化法,无汞快速测定COD。
2.
In this method the masking agent is directly introduced into the determination to eliminate the interference of interfereing elements.
直接加入掩蔽剂消除铅测定中干扰元素对铅的干扰,用此方法对铅铋合金中的铅进行了准确的测定,取得了很好的准确度和重现性。
3.
The pH of both the beginning precipitation and the completion of precipitation,of the slightly soluble compounds,can be determined very conveniently through the logα M(L) -pH curve masking diagram under the conditions of the existence of masking agent.
本文提出的图解法 ,可极为简便地确定掩蔽剂存在时微溶物开始沉淀及沉淀完全时的pH值 ,比文献[1~ 3 ] 方法易于求解 ,计算简便。
5)  Sb and Bi
掩蔽方法
6)  masking action
掩蔽作用
参考词条
补充资料:掩蔽
分子式:
CAS号:

性质:在分析测定多种组分的试样时,共存组分对欲测组分常产生干扰,若在试液中加入一种能与干扰物质发生化学反应的某种试剂,使干扰物质的浓度降低至不致干扰测定反应的程度,从而消除了干扰。此过程称为掩蔽或掩蔽效应(masking effect)。所加入的试剂称为掩蔽剂(masking agent)。根据化学反应的类型不同,掩蔽剂可分为:络合掩蔽剂,它与干扰离子生成更稳定的络合物,这是应用广泛最重要的一类掩蔽剂;沉淀掩蔽剂,与干扰离子生成沉淀;氧化还原掩蔽剂,它是一种氧化剂或还原剂,能改变离子的价态。利用掩蔽法消除干扰,比采用分离方法省时、省力。掩蔽效率用掩蔽指数来衡量,常用符号lgαN(x)表示。N代表干扰离子,X代表络合掩蔽剂,αN(x)表示掩蔽效率。αN(x)=[N]+[NX1]+[NX2]+…+[NXn]/[N]=[N]/[N]。取对数式lgαN(x)=lg[N]/[N]。lgαN(x)称为掩蔽指数。式中[N]表示干扰离子与络合剂X生成络合物各种型体浓度的总和,[N]表示游离干扰离子的浓度。显然,lgαN(x)值越大,游离[N]越少,说明掩蔽效率越高。

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