Benzo‐18‐crown‐6 and its lariat ether derivatives as ionophores for potassium, strontium, and lead ion‐selective electrodes

Abstract

Ion-selective microelectrodes were prepared by coating a matrix containing the crown ether benzo-18-crown-6 or one of five polyether ring-substituted benzo-18-crown-6 derivatives on a preconditioned silver wire in a flow cell. Responses of the electrodes toward lithium, sodium, potassium, magnesium, calciuni, strontium, and lead were measured. Selectivity coefficients were obtained by the matched potential, fixed interference, and separate solution methods. Compared with benzo-18-crown-6, the nature of the side arm in the lariat ether derivatives was found to influence the selectivities in different ways. For specific ionophores, high selectivities of potassium over lithium, sodium, magnesium, calcium, and strontium, of strontium over magnesium and calcium, and of lead over magnesium, calcium, and strontium were demonstrated.

Coated-Wire Silver Ion-Selective Electrode Based on Silver Complex of Cyclam

“…Numerous types of ion selective electrodes (ISEs) for alkali and alkaline earth metal ions based on crown ethers 1,2 have been prepared and studied. A large number of ISEs have been developed because of applications in clinical and industrial measurements.…”

Real-Time Two-Dimensional Imaging of Potassium Ion Distribution Using an Ion Semiconductor Sensor with Charged Coupled Device Technology

“…There are many reports of the use of plasticized PVC membrane as potassium ion selective electrode (ISE). [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] The plasticized PVC membrane was prepared from a typical mixture of neutral-carrier-type ionophore, ion-exchanging material, and plasticizer. During development of the CCD potassium ion sensor, however, poor adhesion of plasticized PVC membranes to the device surface was an obstacle.…”

Strontium(II) Sensor Based on a Modified Calix[6]arene in PVC Matrix

“…Past attempts [2][3][4][5][6][7][8][9] to develop a selective membrane electrode for strontium have not been very successful. Most of these exhibited high response time, limited pH range or significant interference from other alkaline earth metals.…”

“…Most of these exhibited high response time, limited pH range or significant interference from other alkaline earth metals. These electrodes are based on neutral carrier [2][3][4][5][6] and ion exchangers. [7][8][9] Thus, there is a need to explore other materials like calixarenes, tweezers and dendrimers which may show high selectivity towards Sr 2+ .…”