Liquid membrane ion-selective electrodes for diquat and paraquat

GJ Moody, Richard Owusu, JDR Thomas

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Three main types of PVC-liquid membrane ISEs for diquat and paraquat are described. They are based on the crown ether DB30C10 and/or the diquat-paraquat ion pair with tetraphenylborate (DQT.2TPB or PQT.2TPB). With DB30C10-based ISEs (type 1), selectivity for diquat and paraquat over other cations is greatly improved after the addition of DQT.2TPB to the membrane to yield type 2 electrodes. Electrodes based entirely on DQT.2TPB or PQT.2TPB (type 3) also give excellent characteristics with appropriate solvent mediators.Selectivity coefficient data (kpotDQT,B and kpotPQT,B) have been determined with respect to B = Li, Na, K, Mg, Ca, Ba, ammonium, di-methyl ammonium, anilinium and guanidinium. Although the selectivity coefficients frequently exceeded unity for interferents of singly charged B ions, the modifying influence of the square power term in the selectivity relation enhances the selectivity towards diquat and paraquat. For doubly charged B ions the selectivity coefficients for types 2 and 3 electrodes were normally
LanguageEnglish
Pages121-127
JournalANALYST
Volume112
Issue number2
DOIs
Publication statusPublished - Feb 1987

Fingerprint

Diquat
Ion-Selective Electrodes
paraquat
Liquid membranes
Paraquat
electrode
membrane
Electrodes
liquid
Membranes
ion
Ions
Ammonium Compounds
Crown ethers
ammonium
Tetraphenylborate
Crown Ethers
Polyvinyl chlorides
Guanidine
Positive ions

Cite this

Moody, GJ ; Owusu, Richard ; Thomas, JDR. / Liquid membrane ion-selective electrodes for diquat and paraquat. In: ANALYST. 1987 ; Vol. 112, No. 2. pp. 121-127.
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Moody, GJ, Owusu, R & Thomas, JDR 1987, 'Liquid membrane ion-selective electrodes for diquat and paraquat', ANALYST, vol. 112, no. 2, pp. 121-127. https://doi.org/10.1039/AN9871200121

Liquid membrane ion-selective electrodes for diquat and paraquat. / Moody, GJ; Owusu, Richard; Thomas, JDR.

In: ANALYST, Vol. 112, No. 2, 02.1987, p. 121-127.

Research output: Contribution to journalArticle

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AU - Owusu, Richard

AU - Thomas, JDR

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AB - Three main types of PVC-liquid membrane ISEs for diquat and paraquat are described. They are based on the crown ether DB30C10 and/or the diquat-paraquat ion pair with tetraphenylborate (DQT.2TPB or PQT.2TPB). With DB30C10-based ISEs (type 1), selectivity for diquat and paraquat over other cations is greatly improved after the addition of DQT.2TPB to the membrane to yield type 2 electrodes. Electrodes based entirely on DQT.2TPB or PQT.2TPB (type 3) also give excellent characteristics with appropriate solvent mediators.Selectivity coefficient data (kpotDQT,B and kpotPQT,B) have been determined with respect to B = Li, Na, K, Mg, Ca, Ba, ammonium, di-methyl ammonium, anilinium and guanidinium. Although the selectivity coefficients frequently exceeded unity for interferents of singly charged B ions, the modifying influence of the square power term in the selectivity relation enhances the selectivity towards diquat and paraquat. For doubly charged B ions the selectivity coefficients for types 2 and 3 electrodes were normally

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