Phosphate-selective electrodes containing immobilised ionophores

Goff, Thierry Le; Braven, J.; Ebdon, Les; Scholefield, D.

doi:10.1016/j.aca.2004.01.015

Cited by 48 publications

(29 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This new approach will take the discipline forward, with complexity based approaches arising from high resolution data collection. This is certainly the case for water quality in Table 2 Different methodologies associated with disciplines and scales for studying the phosphorus transfer continuum general (Kirchner et al, 2000(Kirchner et al, , 2004, although for P per se, the degree of progress will be constrained by our development of electrodes and appropriate technologies (Le Goff et al, 2004). One particularly novel and exciting development is described in Scholefield et al (2005) who demonstrated concerted diurnal patterns in riverine nutrient concentrations and physical conditions.…”

Section: Conclusion and The Futurementioning

confidence: 99%

The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach

Haygarth¹,

Condron

Heathwaite

et al. 2005

Science of The Total Environment

266

170

View full text Add to dashboard Cite

Section: Conclusion and The Futurementioning

confidence: 99%

The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach

Haygarth¹,

Condron

Heathwaite

et al. 2005

Science of The Total Environment

266

170

View full text Add to dashboard Cite

“…In order to improve the robustness of ISEs, researchers have developed a variety of strategies, such as increasing the lipophilicity 2 International Journal of Electrochemistry of ionophores by adding long alkyl groups and by immobilizing the ionophore within the ion-selective membrane [4]. Several approaches have been used to immobilize ionophores, including copolymerizing the ionophore with comonomers to produce the principal polymer matrix [5][6][7][8][9], covalently attaching the ionophore to modified PVC [10,11], and blending polymer-grafted ionophore with a traditional plasticized PVC matrix [6,12,13]. In addition to improving sensor longevity, ionophore immobilization has also resulted in other apparent advantages, such as improved lower detection limits [13], and elimination of dimer formation within ion-selective membranes based on metalloporphyrins [14].…”

Section: Introductionmentioning

confidence: 99%

Potentiometric Response Characteristics of Membrane-BasedCs+-Selective Electrodes Containing Ionophore-Functionalized Polymeric Microspheres

Peper

Gonczy

2011

International Journal of Electrochemistry

View full text Add to dashboard Cite

Cs + -selective solvent polymeric membrane-based ion-selective electrodes (ISEs) were developed by doping ethylene glycolfunctionalized cross-linked polystyrene microspheres (P-EG) into a plasticized poly(vinyl chloride) (PVC) matrix containing sodium tetrakis-(3,5-bis(trifluoromethyl)phenyl) borate (TFPB) as the ion exchanger. A systematic study examining the effects of the membrane plasticizers bis(2-ethylhexyl) sebacate (DOS), 2-nitrophenyl octyl ether (NPOE), and 2-fluorophenyl nitrophenyl ether (FPNPE) on the potentiometric response and selectivity of the corresponding electrodes was performed. Under certain conditions, P-EG-based ion-selective electrodes (ISEs) containing TFPB and plasticized with NPOE exhibited a super-Nernstian response between 1 × 10 −3 and 1 × 10 −4 M Cs + , a response characteristic not observed in analogous membranes plasticized with either DOS or FPNPE. Additionally, the performance of P-EG-based ISEs was compared to electrodes based on two mobile ionophores, a neutral lipophilic ethylene glycol derivative (ethylene glycol monooctadecyl ether (U-EG)) and a charged metallacarborane ionophore, sodium bis(dicarbollyl)cobaltate(III) (CC). In general, P-EG-based electrodes plasticized with FPNPE yielded the best performance, with a linear range from 10 −1 -10 −5 M Cs + , a conventional lower detection limit of 8.1 × 10 −6 M Cs + , and a response slope of 57.7 mV/decade. The pH response of P-EG ISEs containing TFPB was evaluated for membranes plasticized with either NPOE or FPNPE. In both cases, the electrodes remained stable throughout the pH range 3-12, with only slight proton interference observed below pH 3.

show abstract

“…17 Long-term stability was improved to about 40 d with an attractive ion selectivity that was similar to that of a membrane containing freely dissolved ionophore.…”

Section: Ises: Materials Ionophores Ion-exchangersmentioning

confidence: 97%