掩蔽剂

COD测定中掩蔽剂对测定结果的影响

The Influences of the Masking Agent on the Determination Results of COD

加入硫代乙酰胺（TAA）作掩蔽剂测定ClO2~-。

Thiacetamide ( TAA ) was used as masking agent for chlorite .

以EDTA为掩蔽剂，方法具有良好的选择性。

In the presence of EDTA this method has good selectivity .

所确立的方法无需掩蔽剂和其它分离手段，即可直接用于Pt－Pd催化剂中微量钯的测定，结果满意。

The proposed method has been applied satisfactorily to the direct determination of palladium in Pt-Pd catalysts .

以EDTA作为掩蔽剂，消除了共存金属离子的干扰，提高了方法的选择性。

The interference resulted from most of metal ions was masked by EDTA .

采用EDTA为掩蔽剂，方法的选择性较高。

In the existence of EDTA , the selectivity of the method is higher .

以EDTA为掩蔽剂，可直接测定工业硅中的微量钙。

The method was directly used to determine Ca in industrial silicon with elimination of other element interference by EDTA .

载流溶液为异丙醇，混合显色剂组分为异丙醇、三乙醇胺、Br－PADAP和掩蔽剂。

Mixing colour solution contains isopropyl alcohol , triethanolamine , masking reagent and Br-PADAP .

介绍EDTA容量法测定萤石中氟化钙时所使用的主要试剂、掩蔽剂等的选择。

The selection of main reagents and screening agents has been introduced for measuring the calcium fluoride in fluorite by EDTA volumetric method .

方法准确、重复性好，可以代替以KI为掩蔽剂的EDTA滴定法。

The method had the character of high accuracy and good repeatability . It might replace EDTA titration with KI as the masking agent .

在700℃将样品灰化4h以上，通过加入掩蔽剂来掩蔽干扰离子。

Through adding masking agent to mask interfering ions , after samples was burned to ashes at 700 ℃ for at least 4 h.

提出了以NaF作掩蔽剂，氢化物发生原子荧光（HGAFS）测定土壤中水溶态的Sb（Ⅲ）和Sb（Ⅴ）的方法。

A method for determination of water-soluble Sb (ⅲ) and Sb (ⅴ) in soil by hydride generation atomic fluorescence spectrometry ( HG-AFS ) with sodium fluoride as a masking agent was been developed .

加入硫脲作掩蔽剂和用NH3-NH4CI预分离干扰元素可提高方法的选择性。

The selectivity of the method may be increased by addition of thiocarbamide as masking reagent and pre-separation of the interferential elements using NH_3-NH_4Cl . This method is simple , rapid and accurate .

〔目的〕探讨TISAB溶液作为金属离子掩蔽剂和OH-离子的pH调节剂对氟离子选择电极测定牙膏氟含量的影响。

This is to study the effect of TISAB as masking agent of metal ions and pH conditioning agent of ion to the determination of total fluorine in toothpaste by ion selective electrode method .

研究了硼氢化钾－硝酸银分光光度法测定3861双金属重整催化剂中砷含量时共存组分的影响.讨论了硫脲络合掩蔽剂的用量及加入顺序.消除了2mg铂的干扰；

Determination of arsenic in 3861 bimetallic reforming catalyst by potassium borohydride-silver nitrate spectrophotometry is described , the influence of coexistence components on this method are discussed .

探讨了以EDTA/THAM溶液作为金属离子掩蔽剂和OH-离子的pH调节剂，用氟离子选择电极测定NaF药物牙膏中总氟含量的测定方法。进行了不同条件、不同仪器、不同方法的对比试验；

This article makes an inquiry into the testing method on the total fluorine in the toothpaste containing NaF with using fluoride selective electrode and using EDTA / THAM solution as ion masking agent and pH conditioning agent of ion .

以EDTA为掩蔽剂可消除Pb2＋、Cu2＋、Fe3＋等离子的干扰，用空白减差法可消除合成及天然色素等物质的影响。

The interference of Pb2 + , Cu2 + and Fe3 + ions could eliminated the using EDTA as the masking agent . The influence of natural or synthetic pigments could eliminated by corrected method .

采用硝酸银和硝酸铋联合掩蔽剂可以取代标准重铬酸钾法测定（COD）中使用的硫酸汞，从而避免汞对环境的污染，并使用这种新方法测定了多种类型的水样。

The united inhibitory method using silver nitrate and bismuth nitrate may replace the mercuric sulfate in standard potassium dichromate method for the determination of chemical oxygen demand avoid mercuric pollution to environment , Using the new method , We determined various water samples .

该方法无需加入掩蔽剂或其他分离手段，即可直接用于Pd-C催化剂和矿石中钯的测定。

The proposed method has been applied directly to the determination of palladium in Pd-C catalyst and ore samples with satisfactory results .

以Luminol-H2O2作化学发光试剂，用阳离子交换树脂在线吸附大多数金属离子的干扰，用EDTA作掩蔽剂消除残余的干扰元素。

Luminol-H2O2 has been used as luminescent reagents . After separation most metal ions by Cationic exchange resin online , EDTA was used as the mask to dispel the effect of residual interference elements .

在乙醇存在下，以偶氮胂Ⅲ为指示剂，乙二胺、磺基水杨酸为掩蔽剂，EDTA容量法直接测定稀土萃取分离工艺负载有机相中稀土浓度。

In the presence of ethyl alcohol , the content of rare earths ( RE ) in the organic phase of extraction obtained from the separation technology is directly titrated with EDTA , using arsenazo ⅲ as indicator and ethylenediamine and sulfosalicylic acid as masking agents .

提出了以硫脲-抗坏血酸-盐酸羟胺作为混合还原掩蔽剂，氢化物发生-原子荧光光谱法（HG-AFS）测定高纯锌中砷、锑、铋的方法。

A method for the determination of arsenic , antimony and bismuth in high purity zinc by hydride generation-atomic fluorescence spectrometry ( HG-AFS ) with thiourea-ascorbic acid-hydroxylamine hydrochloride as masking and reducing reagent has been proposed .

以硫氰酸甲作金的掩蔽剂，用SnCl2在强碱介质中还原化合汞为原子汞进行汞的冷原子吸收测定。

Mercury in crude gold has been determined directly without separation by AAS with potassium thiocyanate as the masking reagent for gold and SnCl_2as reductant to reduce mercury into the vapour atomic mercury in NaOH medium .

利用AFS-920双道原子荧光光度计，采用氢化物-原子荧光法测定面粉中的铅含量，通过试验确定了仪器工作参数，载气、屏蔽气流量，介质和掩蔽剂的用量等。

Lead in flour was determined by hydride atom fluorescence spectrometry . The apparatus parameters , the flow rate of carrier gas and sheath gas , the amount of media and masking agent were determined after experiment .

发现本方法中以NH4F为掩蔽剂，在分析粗铅及铅锑合金中铅含量时不受杂质因素的干扰，具有分析结果准确、不需重复分析等优点。

It is clear : usingNH 4F as a shelter agent , the result of lead content in raw lead and Pb-Sb alloys is not affected by foreign matter , the result is accurate , and only one time needs to analyze .

实验证明，将K2C2O4作为掩蔽剂时，利用过量的KIO3与过量的Na2S2O3在酸性溶液中的氧化还原反应可以测定体系中的游离酸。

The experiments show that the free acidity of a ferric or / and ferrous solution can be determined by a reaction of KIO 3 and Na 2S 2O 3 , taking K 2C 2O 4 as a masking agent .

锅炉炉水中磷酸盐掩蔽剂的掩蔽效果分析

Analysis of Effects of Phosphate Masking Agent in Boiler Water

植酸在络合滴定铜时作为掩蔽剂的研究

Study on Phytic Acid as a Masking Agent in Complexometric Titration of Copper

掩蔽剂对萃取光度分析适宜酸度范围的影响

The Influences of Optimum Acidity Range by Masking Agent in Extraction Spectrometric Determination

分析化学中掩蔽剂及解蔽剂的定性选择和掩蔽效应的定量讨论

Qualitative selectivity of masking agent and quantitative discussion of masking effect in Analytical Chemistry