Detection limit of polymeric membrane potentiometric ion sensors: how can we go down to trace levels?

Mi, Yanming; Mathison, Sally; Goines, Roderick; Logue, Alicia; Bakker, Eric

doi:10.1016/s0003-2670(99)00396-7

Cited by 57 publications

(27 citation statements)

References 27 publications

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“…Thus, the two sides of membrane are failed in achieving a thermodynamic equilibrium and higher detection limit was obtained. This is also parallel to previous study by Mi et al [40] who reported that if the membrane is not at a steady stage, a higher influx of ion will lead to a higher detection limit.…”

Section: Results and Discussion Effect Of Lipophilic Salt Natfpb On Csupporting

confidence: 90%

A Screen-Printed Copper Ion Sensor With Photocurable Poly(n-Butyl Acrylate) Membrane Based on Ionophore O-Xylylene Bis(n,n-Diisobutyldithiocarbamate)

Ying

Lee²

2017

MJAS

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A screen-printed copper ion sensor with photocurable poly(n-butyl acrylate) (pBA) membrane based on ionophore o-xylylene bis(N,N-diisobutyldithiocarbamate) (o-xc) was successfully fabricated. Poly(2-hydroxylethyl methacrylate) (pHEMA)-modified Ag/AgCl screen-printed electrode was used in the development of the sensor and the sensor was characterized by potentiometric method. Optimization of pBA membrane for the electrode was carried out by varying the compositions of sodium tetrakis [3,5-bis(trifluoromethyl)phenyl]borate (NaTFPB) and o-xc to determine the best analytical performance. The addition of NaTFPB and the increment of its ratio relative to o-xc showed super-Nernstian, small linear range, and high detection limit. For sensor fabricated based on o-xc without the addition of NaTFPB, the sensor showed Nernstian response. The best optimized sensor showed Nernstian slope with 31.29 mV/decade over a wide linear range of 1.0 × 10 -2 -1.0 × 10 -6 M and low detection limit of 1.89 × 10 -7 M. The sensitivity of this sensor was also improved over the other copper ion sensors fabricated by similar photocuring technique. In addition, based on the separate solution method (SSM), this sensor exhibited good selectivity towards copper ion with low logarithm selectivity coefficient value for monovalent and divalent cations namely K Keywords: screen-printed copper ion sensor, photocurable poly(n-butyl acrylate) membrane, ionophore o-xylylene bis(N,Ndiisobutyldithiocarbamate), potentiometry Abstrak Sensor ion kuprum bercetak skrin yang berasaskan kepada ionofor o-xililen bis(N,N-diisobutilditiokarbamat) (o-xc) dalam membran terawatfoto poli(butil-akrilat) (pBA) telah dibangunkan. Sensor ion elektrod bercetak skrin Ag/AgCl terubahsuai poli(2-hidroksiletil metakrilat) (pHEMA) telah digunakan dalam pembangunan sensor dan pencirian sensor telah dijalankan melalui kaedah potensiometri. Pengoptimunan komposisi membran sensor ion pada elektrod telah dijalankan untuk menentukan prestasi analisis yang terbaik dengan mengubah komposisi sodium tetrakis[3,5-bis(trifluorometil)fenil]borat (NaTFPB) dan o-xc. Penambahan NaTFPB dan peningkatan nisbahnya terhadap o-xc dalam membran menunjukkan super-Nernstian, julat linear yang pendek dan had pengesanan yang tinggi. Sensor ion yang direka bentuk dengan menggunakan o-xc tanpa penambahan NaTFPB menunjukkan rangsangan Nernstian. Sensor ion yang terbaik menunjukkan kecerunan Nernstian iaitu 31.29mV/dekad, julat linear dari 1.0 × 10 -2 -1.0 × 10 -6 M dan had pengesanan terendah 1.89 × 10 -7 M. Kepekaan sensor yang telah dibangunkan juga adalah lebih baik berbanding dengan sensor-sensor ion kuprum lain yang telah direka bentuk melalui kaedah rawatan foto yang sama. Nilai pekali keselektifan potensiometri ditentukan dengan kaedah larutan berasingan (SSM). Sensor tersebut juga memberikan keselektifan yang baik terhadap kation pengganggu dengan menunjukkan nilai pekali logaritma keselektifan yang rendah bagi kation monovalen dan divalen seperti K

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Section: Results and Discussion Effect Of Lipophilic Salt Natfpb On Csupporting

confidence: 90%

A Screen-Printed Copper Ion Sensor With Photocurable Poly(n-Butyl Acrylate) Membrane Based on Ionophore O-Xylylene Bis(n,n-Diisobutyldithiocarbamate)

Ying

Lee²

2017

MJAS

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“…À8 M detection limits [180]. These improvements were interpreted in terms of a lower extent of coextraction of inner electrolyte into the membrane with increasing dilution.…”

Section: Means To Improve Lower Detection Limitsmentioning

confidence: 96%

“…With ionophore-based membranes, it has recently been argued that several processes can lead to leaching of analyte ions into the sample, including the extraction of analyte ions together with their lipophilic counterions from the membrane [180], the codiffusion of analyte ions and hydrophilic counterions from the inner electrolyte across the membrane [181], and counterdiffusion of analyte ions from the membrane with interferents of the same charge type from the sample [56,140]. By understanding these processes, signi®cant improvements were achieved recently in lowering the detection limit of ionophorebased ISEs.…”

Section: Why Have Membrane Electrodes Had Somentioning

confidence: 99%

Polymer Membrane Ion-Selective Electrodes-What are the Limits?

Bakker¹,

Bühlmann²,

Pretsch³

1999

Electroanalysis

Self Cite

342

197

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This article reviews recent advances in the ®eld of potentiometric solvent polymeric membrane electrodes. These sensors have found widespread applications in a variety of ®elds, especially in the area of clinical diagnostics. Emphasis is given on the discussion of the theoretical and practical limits of ionophore-based ion-selective electrodes, with a special focus on electrode sensitivities, characterization of selectivities and dramatic improvements in detection limits. Advances in ionophore design and in the underlying model assumptions are also discussed. It is shown that a multitude of exciting new research possibilities have recently emerged in this well±established ®eld.

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“…The lower limit of detection (LOD) is critical for ISEs to be used for detecting trace levels of heavy metal ions. The discovery and understanding of sample contamination due to various chemical processes by which some of the internal analyte ions leach out into the aqueous phase has contributed to significantly lowering the limit of detection [51,52]. It was found that a careful design of the internal solution, such as altering the composition of the inner electrolyte solution or simply diluting the inner electrolyte, can minimize the analyte ion flux from the membrane into the sample, and thus substantially lowering the limit of detection [53,54].…”

Section: Liquid-contact Ion-selective Electrodesmentioning

confidence: 99%

Ion-Selective Electrodes for Detection of Lead (II) in Drinking Water: A Mini-Review

2018

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Despite the fact that the adverse health effects due to the intake of lead have been well studied and widely recognized, lead contamination in drinking water has been reoccurring worldwide, with some incidents escalating into a public drinking water crisis. As lead contamination is often related to lead-based pipes close to or inside homes, it is not realistic, at least in the near term, to remove and replace all lead connection pipes and lead-based plumbing. Effective monitoring of lead concentration at consumers' water taps remains critical for providing consumers with first-hand information and preventing potential wide-spread lead contamination in drinking water. This review paper examines the existing common technologies for laboratory testing and on-site measuring of lead concentrations. As the conventional analytical techniques for lead detection require using expensive instruments, as well as a high time for sample preparation and a skilled operator, an emphasis is placed on reviewing ion-selective electrode (ISE) technology due to its superior performance, low cost, ease of use, and its promising potential to be miniaturized and integrated into standalone sensing units. In a holistic way, this paper reviews and discusses the background, different types of ISEs are reviewed and discussed, namely liquid-contact ISEs and solid-contact ISEs. Along with the potential opportunities for further research, the limitations and unique challenges of ISEs for lead detection are also discussed in detail.

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Detection limit of polymeric membrane potentiometric ion sensors: how can we go down to trace levels?

Cited by 57 publications

References 27 publications

A Screen-Printed Copper Ion Sensor With Photocurable Poly(n-Butyl Acrylate) Membrane Based on Ionophore O-Xylylene Bis(n,n-Diisobutyldithiocarbamate)

A Screen-Printed Copper Ion Sensor With Photocurable Poly(n-Butyl Acrylate) Membrane Based on Ionophore O-Xylylene Bis(n,n-Diisobutyldithiocarbamate)

Polymer Membrane Ion-Selective Electrodes-What are the Limits?

Ion-Selective Electrodes for Detection of Lead (II) in Drinking Water: A Mini-Review

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