Anion-selective liquid membrane electrodes based on lipophilic quaternary ammonium compounds

Wegmann, Dorothée; Weiss, H.; Ammann, D.; Morf, Werner E.; Pretsch, Ernö; Sugahara, Kiyoshi; Simon, W.

doi:10.1007/bf01204153

Cited by 141 publications

(95 citation statements)

References 30 publications

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“…18 Tetraalkylammonium salts have been known as the ionophores for anion selective electrodes [20][21][22][23] and as the ligands for Bu2SnCl2. 25,28 The dialkyltin trihalide complexes prepared from Bu2SnCl2 and Bu4NZ (Z=Cl, NO3, SCN) were expected to express the unique and the high anion selectivity.…”

Section: Resultsmentioning

confidence: 99%

Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

et al. 2000

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Section: Resultsmentioning

confidence: 99%

Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

et al. 2000

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“…30 This range was found to be in compatible with a commercial electrode. The limit of detection, as determined from the intersection of two extrapolated segments of the calibration graph, was 3.1 × 10 -7 M. 31 …”

Section: Influence Of Membrane Compositionmentioning

confidence: 99%

Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II)

et al. 2006

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Experimental ReagentsReagent-grade high relative molecular weight PVC, trioctylmethyl ammonium chloride (TOMAC) and dioctyl phthalate (DOP) were used as received from Aldrich. Potassium or sodium salts of all anions, tetrahydrofuran (THF); all other chemicals were of highest purity available from Merck, and were used without further purification, except for THF, N′-ethylene-bis(4-methylsalicylidineiminato)nickel(II) [Ni(EBMSI)] complex as a carrier for a thiocyanate-selective electrode is reported. The influences of the membrane composition, pH and possible interfering anions were investigated based on the response properties of the electrode. The electrode exhibited a good Nernstian slope of -58.9 ± 0.7 mV decade -1 , over a wide pH range of 3.5 -8.5 and a linear range of 1.0 × 10 -6 -1.0 × 10 -1 M for thiocyanate. The detection limit of electrode was 3.1 × 10 -7 M SCN -. The selectivity coefficients determined by a fixed interference method (FIM) indicate that a good discriminating ability towards the SCN -ion compared to other anions. The proposed sensor had a fast response time of about 5 -15 s and could be used for at least 3 months without any considerable divergence in the potential. It was applied as an indicator electrode in the titration of thiocyanate with Ag + and in the potentiometric determination of thiocyanate in saliva and urine samples.

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“…In general, the sensors obeyed the Hofmeister lyotropic anion selectivity sequence, I ->NO3 ->Br ->Cl ->CH3COO ->SO4 2-, just as expected because the potentiometric response relied on an ionexchange process. This sequence represented the order of extractability of these anions into organic solvents [30], which is mainly governed by differences in hydration energy.…”

Section: Effect Of Phmentioning

confidence: 99%

Rapid automated method for on-site determination of sulfadiazine in fish farming: a stainless steel veterinary syringe coated with a selective membrane of PVC serving as a potentiometric detector in a flow-injection-analysis system

et al. 2011

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Sulfadiazine is an antibiotic of the sulfonamide group and is used as a veterinary drug in fish farming. Monitoring it in the tanks is fundamental to control the applied doses and avoid environmental dissemination. Pursuing this goal, we included a novel potentiometric design in a flow-injection assembly. The electrode body was a stainless steel needle veterinary syringe of 0.8-mm inner diameter. A selective membrane of PVC acted as a sensory surface. Its composition, the length of the electrode, and other flow variables were optimized. The best performance was obtained for sensors of 1.5-cm length and a membrane composition of 33% PVC, 66% onitrophenyloctyl ether, 1% ion exchanger, and a small amount of a cationic additive. It exhibited Nernstian slopes of 61.0 mV decade -1 down to 1.0×10 -5 mol L -1 , with a limit of detection of 3.1×10 -6 mol L -1 in flowing media. All necessary pH/ionic strength adjustments were performed online by merging the sample plug with a buffer carrier of 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, pH 4.9. The sensor exhibited the advantages of a fast response time (less than 15 s), long operational lifetime (60 days), and good selectivity for chloride, nitrite, acetate, tartrate, citrate, and ascorbate. The flow setup was successfully applied to the analysis of aquaculture waters. The analytical results were validated against those obtained with liquid chromatography-tandem mass spectrometry procedures. The sampling rate was about 84 samples per hour and recoveries ranged from 95.9 to 106.9%.

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Anion-selective liquid membrane electrodes based on lipophilic quaternary ammonium compounds

Cited by 141 publications

References 30 publications

Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

Anion Selectivities of Dibutyltin Dihalides as Neutral Carriers for Ion-Selective Electrodes

Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II)

Rapid automated method for on-site determination of sulfadiazine in fish farming: a stainless steel veterinary syringe coated with a selective membrane of PVC serving as a potentiometric detector in a flow-injection-analysis system

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