Lead ionophore IV – High Purity for ISE | Selectoprobe

References

Arida HA, Al-Haddad A, Schöning M J. New solid-state organic membrane based lead selective micro-electrode. WIT Trans. Modell. Simul., 2011,51:547-557; DOI: 10.2495/CMEM110481.

Abstract
A novel thin-film organic membrane-based lead-selective microelectrode was developed and characterized. The gold thin-film substrate was electrochemically pre-treated using a new technique. The microelectrode employs tert-butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide) as the sensing material, carboxylated PVC as the matrix, 2-nitrophenyl octyl ether as the solvent mediator, and potassium tetrakis(4-chlorophenyl) borate as the lipophilic additive. It exhibits a nearly Nernstian response (28 ± 0.5 mV/decade) within a Pb²⁺ concentration range of 1×10⁻⁶ to 1×10⁻² mol/L, with good selectivity over competing ions. The electrode features simple fabrication, low cost, and suitability for automation and integration. It demonstrated high accuracy (95.5% recovery), precision (RSD < 3%), rapid response (<30 s), and long-term stability (>4 months). The microelectrode was successfully applied to detect Pb²⁺ in aqueous samples, with results validated by ICP-AES.

References

Shunyang Y. A solid-contact Pb 2+-selective electrode using poly (2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene) as ion-to-electron transducer. Analytica Chimica Acta, 2011, 702 (2), 195-198

Abstract

A novel all-solid-state Pb²⁺-selective electrode was developed using poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV) as the solid contact. The ion-to-electron transducing capability of MEH-PPV was confirmed via chronopotentiometry and electrochemical impedance spectroscopy. The electrode exhibited a Nernstian response of 29.1 mV/decade and a subnanomolar detection limit. Notably, no water film formation was observed when paired with a plasticized PVC membrane. This study presents a promising approach for the fabrication of robust and highly sensitive polymeric ion sensors.

References

Darestani-Farahani, Maryam, et al. A highly sensitive ion-selective chemiresistive sensor for online monitoring of lead ions in water. Analyst, 2024, 149.10, 2915-2924.

Abstract

Lead contamination in drinking water poses a significant health risk, yet continuous real-time monitoring remains a challenge. This study presents a chemiresistive sensor with a lead-selective membrane for detecting Pb²⁺ ions in real-time. By stabilizing the resistive film surface with sodium hydroxide and 15-crown-5 ether and optimizing sensor geometry, the detection limit was reduced to below 2 μg/L, with a measurable range up to 3 mg/L over multiple cycles. The detection mechanism relies on Pb²⁺ complexation by ionophores within the membrane, modulating interactions with the chemiresistive film. The sensor offers improved sensitivity over potentiometric devices, eliminating the need for a reference electrode, making it robust, simple to fabricate, and suitable for continuous lead monitoring in drinking water systems.

Lead ionophore IV | C60H84N4O4S4 | CID 5147889 - PubChem (nih.gov)

Catalog No	SP-I-0017
Formula	C60H84N4O4S4
Purity	> 97%
Weight	50mg, 100mg
Lead Time	3-4 weeks
CAS No	145237-46-3
Synonym	tert-butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide)
MW	1053.59