A new sulfate-selective electrode and its use in analysis

Егоров, В. В.; Nazarov, V. A.; Okaev, E. B.; Pavlova, T. E.

doi:10.1134/s1061934806040150

Cited by 19 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The above proportions of membrane components have been selected on the basis of our previous works. In particular, in the [22] it has been shown that, for the membrane to be mechanically strong enough, the PVC content in the membrane should be no less than 33% w/w. From preliminary experiments it has been established that the most stable performance of the ISE (potential reproducibility) is achieved at 5% w/w of QAS.…”

Section: Methodsmentioning

confidence: 99%

Higher quaternary ammonium salts with the sterically accessible exchange center: application for development of Selenate selective electrodes

Matveichuk¹,

Em²

2017

Madridge J Anal Sci Instrum

View full text Add to dashboard Cite

A new film selenate selective electrode has been developed, with the following membrane composition: (3,4,5-tris-dodecyloxybenzyl)tetraoxyethyl trimethyl ammonium chloride (5% w/w) as an electroactive component, (poly)vinyl chlorid (33% w/w) as a membrane matrix, 1-bromonaphtalene (42% w/w) as a plasticizer, (4-trifluoroacetyl) benzoic acid heptyl ester (20% w/w) as a neutral anion carrier. The electrode characteristics are as follows: linear range -2•10 -6 -10 -2 М by Na 2 SeO 4 ; line plot slope 26,0±0,3 mV/decade; lower detection limit 1•10 -6 М by Na 2 SeO 4 ; working рН range 2,15 -6,3; potential drift 0,9 mV/h; response time 15 -90 s; selectivity in presence of chloride, bromide, sulfate and other ions; lifetime up to 3 weeks. The electrode developed has been tested on model solutions using the standard addition method in the calibration plot variant, and bracketing technique.

show abstract

Section: Methodsmentioning

confidence: 99%

Higher quaternary ammonium salts with the sterically accessible exchange center: application for development of Selenate selective electrodes

Matveichuk¹,

Em²

2017

Madridge J Anal Sci Instrum

View full text Add to dashboard Cite

show abstract

“…The effects observed steric connected with the effect of the exchange center steric accessibility on the molybdate ISE selectivity, can be on qualitatively interpreted by the corresponding change of ion association constants for ions being exchanged: in the model where QAS exists in the form of ion triples with double charged anions and no associates of greater complexity are formed, the ion association constant is described by Eigen-Denison-Ramsey-Fuoss equation [15,22,23]. Selecting the working pH range.…”

Section: Volume 3 • Issue 1 • 1000113mentioning

confidence: 99%

A New Molybdate-selective electrode based on Higher quaternary Ammonium Salts

Matveichuk¹

2018

Madridge J Anal Sci Instrum

View full text Add to dashboard Cite

Membrane composition of molybdate-selective electrodes based on higher quaternary ammonium salts has been optimized. It is found that the best analytical characteristics of electrodes are based on 3,4,5-tris-dodecyloxybenzyl) tetraoxyethyltrimethyl ammonium in chloride form (5% w/w) with the addition in membranes of the solvating additive (neutral carrier) − p-heptyl ester 4-trifluoroacetylbenzoic acid (TFABAHE, 20% w/w). Their analytical characteristics: low detection limits (1•10 −6 mol/l); logarithm selectivity coefficients relative to interfering chloride -1,-4, sulfate -0.8, bromide -0.7, tungstate -0.9 ions; working range of pH (8.5−9.5); slope of the electrode function (24.4 mV/decade) are determined. Sodium molybdate aqueous solutions has been studied with FT-IR spectrometry method at various pH. In sodium molybdate solutions at pH greater than 8.0-8.5 hydrolytic processes are mild. However, using a molybdate-selective electrodes is better to use freshly prepared solutions. This increases the reproducibility of the experimental results. The proposed electrode was employed to determine of molybdate ions of model water samples using the calibration plot method.

show abstract

“…Besides classical gravimetry and turbidimetry, the common methods for determination of SO 4 2À are potentiometry [1][2][3] and ion chromatography [4][5][6][7][8][9]. However, these techniques have certain drawbacks such as the large volume of a sample, the high consumption of chemicals, the poor selectivity in some cases, the long elution times, and the high operational cost.…”

Section: Introductionmentioning

confidence: 99%