Copper(II) ion selective electrode based on a newly synthesized Schiff-base chelate

Abstract

A new Cu (II) ion-selective electrode has been fabricated in poly (vinyl chloride) matrix based on a recently synthesized Schiff-base chelate. The addition of sodium tetraphenylborate (NaTPB) and various plasticizers viz. TBP, TEHP, DOS, and CN have been found to substantially improve the performance of the electrode. The membrane of various compositions of the ionophore (I) were investigated and it was found that the best performance was obtained with the membrane having (I): PVC: NaTPB: CN in the ratio 4: 140: 3: 80 (mg). The electrode exhibits a Nernstian response over a wide concentration range (1.9 9 10 -6 -1.0 9 10 -1 M) with 30.0 mV/decade of concentration between pH 3.0 and 7.5. The response time of the electrode is about 12 s and it can be used over a period of 3 months without any divergence in potential. The potentiometric selectivity coefficient values as determined by fixed interference method indicate excellent selectivity for Cu 2+ ions over interfering cations. The electrode has also been used successfully in partially nonaqueous media having a 25% (v/v) methanol, ethanol or acetone content without showing any considerable change in the value of slope or working concentration range. The electrode has been used in the potentiometric titration of Cu 2+ with EDTA.

Indigo Carmine-Cu complex probe exhibiting dual colorimetric/fluorimetric sensing for selective determination of mono hydrogen phosphate ion and its logic behavior

“…Herein, new applications of IC as a colorimetric sensor for detection of Cu 2+ as a fluorescent and colorimetric chemosensor for highly selective and sensitive determination of MHP anion and have been reported. Investigating UV-Vis spectrum of IC upon addition of Cu 2+ and HPO 4 2-as chemical inputs, two logic gates were constructed. The proposed method can be applied for analysis of real samples satisfactory.…”

“…7, the best colorimetric response of the [IC-Cu 2 ] complex are achieved in pH 7.5-10. According to the above estimation, proposed chemosensor offers high selectivity toward HPO4 2-over other phosphate species.Furthermore, in the pH 7.5, the best fluorimetric response of the IC-Cu 2 are obtained which shows in the pH values more than 7.5, the Photo-induced Electron Transfer (PET) and Photo-induced Charge Transfer (PCT) from OH -to the fluorophore moiety of [IC-Cu 2 ] make the fluorescent signal OFF. Therefore, pH 7.5 was chosen for all colorimetric and fluorimrtric measurements.…”

“…Nezamzadeh and Masoudipour, presented a potentiometric method for determination of phosphate [25]. Kivlehan et al proposed A C C E P T E D M A N U S C R I P T 4 a membrane electrode based on calyx [4] arene anion receptor for mono hydrogen phosphate (MHP) determination was proposed [26]. Modi et al reported a phenyl urea substituted calix [4] arene for MHP ion selective membrane electrode [27].…”

Ni(II) selective sensors based on Schiff bases membranes in poly(vinyl chloride)

“…In the present study, the selectivity coefficients were determined using the fixed interference method (FIM) [39][40][41]. In this method selectivity coefficient was evaluated by potential measurement on solutions containing fixed concentration of interfering ion (1.0 × 10 −2 M) and varying concentration of primary ion Ni(II).…”

Fabrication of an iron(III)-selective PVC membrane sensor based on a bis-bidentate Schiff base ionophore

“…Recently, several greatly selective and sensitive polyvinyl chloride (PVC) membrane ISEs for various metal ions have been reported [17][18][19][20][21][22][23][24][25][26]. In this work, we wish to introduce a highly Fe 3?…”