Complexometric determination of mercury(II) by use of 4-amino-5-mercapto-3-propyl-1,2,4-triazole as replacing reagent

GADIYAR, H

doi:10.1016/0039-9140(82)80157-4

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…The method extends the working range up to about 100 mg of mercury(II), compared with 75 mg for other reagents [6][7][8][9][10], and also work at the 10 mg level.…”

Section: Discussionmentioning

confidence: 99%

“…Selective determination of Hg(II) using Nallylthiourea as masking agent is inconvenient because it involves heating to decompose the Hg-EDTA complex and some precipitation of HgS also occurs [5]. Determination of Hg(II) using 4-amino-5-mercapto-3-propyl-l,2,4-triozole [6], thiocyanate [7], 2-imidazolidinethione [-8] or hexahydropyrimidine-2-thione I-9] as the replacing reagent was however found to be reliable. Some of these masking reagents [-6, 8, 9] require tedious and time-consuming preparation.…”

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confidence: 99%

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Selective complexometric determination of mercury with sulphite as indirect masking reagent

Rao

Narayana

1993

Mikrochim Acta

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Abstract.A complexo-titrimetric method for the determination of mercury (II) in the presence of other metal ions is described, based on the selective masking ability of sulphite ion towards Hg(II). Mercury in a given sample solution is initially complexed with a known excess of EDTA and the surplus EDTA titrated with zinc sulphate solution at pH 5.0-6.0 (hexamine), using xylenol orange (or methylthymol blue) as indicator. An excess of solid sodium sulphite is then added to decompose the Hg(II)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. Reproducible and accurate results are obtained for 9.9-99 mg Hg with relative errors < 0.35% and standard deviations < 0.05 mg. The effects of various cations and anions are studied.Key words: mercury determination, EDTA titration, complexometry, masking, sodium sulphite.Mercury(II) is not normally determined by direct EDTA titration, particularly in the presence of other ions. Instead, Hg(II) and other metals are complexed with EDTA, followed by selective decomposition of the Hg-EDTA complex with a masking agent such as thiosemicarbazide and titration of the liberated EDTA [1]. Cu(II) interferes severely in the above method. In alkaline medium, potassium iodide may be used as a masking agent for the estinaation of Hg(II) in the presence of Cu(II), but several other cations interfere [2]. With thiourea [3] as masking agent, interference by copper was avoided by controlling the pH at 5.5 and cooling below 15~ good results are obtainable provided that thiourea is in only slight excess over the stoichiometric proportions. Obviously, this is difficult to ensure in the case of unknown concentrations of mercury. In the determination of Bi(III) at pH 1.0, thiocyanate is used to mask Hg(II). The mercury thiocyanate complex is then decomposed by silver ions and the liberated mercury(II) titrated with EDTA at * Present address:

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“…The method extends the working range up to about 100 mg of mercury(II), compared with 75 mg for other reagents [6][7][8][9][10], and also work at the 10 mg level.…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Selective complexometric determination of mercury with sulphite as indirect masking reagent

Rao

Narayana

1993

Mikrochim Acta

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“…Some other masking agents, such as 4-amino-5-mercapto-3-npropyl-1,2,4-triazole [17], 2-imidazolidinethione [18], and hexahydropyrimidine-2-thione [19] require tedious and timeconsuming syntheses, as they are not readily available. In many of these methods, Cu(II) or other metal ions show interference.…”

Section: Introductionmentioning

confidence: 99%

Quantitative complexometric determination of mercury(II) in synthetic alloys and complexes using 2-thiazolinethiol as a masking agent

Parameshwara

Karthikeyan

Shetty

et al. 2006

JICS

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A simple, rapid and selective complexometric method is proposed for the determination of mercury(II). Mercury(II) and other related metal ions are first complexed with an excess of EDTA and the surplus EDTA is back-titrated with a standard lead nitrate solution at pH 5.0-6.0 (hexamine buffer) using xylenol orange as an indicator. A 0.2% solution of 2-thiazolinethiol in acetone is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with a standard lead nitrate solution as before. Reproducible and accurate results are obtained in the range of 0.8 g l -1 -15.8 g l -1 of mercury with a relative error less than ±0.25% and a coefficient of variation (n = 6) not higher than 0.28%. The interference of various ions was studied and the method was employed for the analysis of mercury in its synthetic alloy mixtures and in complexes.

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“…4-Amino-5-mercapto-3-propyl-1, 2, 4-triazole 3 , thiocyanate 4 , 2-imidazolidinethione 5 , 2-mercaptoethanol 6 , 3-mercapto-1,2-propanediol 7 , acetylacetone 8 , thioglycolic acid 9 and 2-mercapto propionyl glycine 10 are also used as demasking agents for Hg(II). Some of these reagents 3,5 require tedious and time-consuming procedures. In this paper, selective decomposition of the Hg-EDTA complex by the addition of glutathione at pH 5.0-6.0 at room temperature is described.…”

Section: Introductionmentioning

confidence: 99%

Complexometric Determination of Mercury(II) Using 2-Mercaptopropionylglycine as a Selective Masking Reagent

Shetty

Gadag

2001

Microchimica Acta

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A simple, rapid and selective complexometric method is proposed for the determination of mercury(II) in the presence of associated metal ions. Mercury(II) is first complexed with an excess of EDTA and the surplus EDTA is titrated against standard zinc sulphate solution at pH 5-6 using xylenol orange indicator. Glutathione is then added to displace EDTA from the Hg-EDTA complex quantitatively and the EDTA released is back titrated against a standard zinc sulphate solution as before. The method works well in the range 4 to 80 mg of mercury with a relative error of less than 0.30% and a coefficient of variation of not more than 0.38%. The effect of the presence of various diverse ions has been studied.The method is used for the determination of mercury(II) in its alloys and complexes.

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Complexometric determination of mercury(II) by use of 4-amino-5-mercapto-3-propyl-1,2,4-triazole as replacing reagent

Cited by 11 publications

References 3 publications

Selective complexometric determination of mercury with sulphite as indirect masking reagent

Selective complexometric determination of mercury with sulphite as indirect masking reagent

Quantitative complexometric determination of mercury(II) in synthetic alloys and complexes using 2-thiazolinethiol as a masking agent

Complexometric Determination of Mercury(II) Using 2-Mercaptopropionylglycine as a Selective Masking Reagent

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