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Benzo‐18‐crown‐6 and its lariat ether derivatives as ionophores for potassium, strontium, and lead ion‐selective electrodes
Author(s) -
Attiyat Abdulrahman S.,
Christian Gary D.,
Cason C. Victor,
Bartsch Richard A.
Publication year - 1992
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140040111
Subject(s) - strontium , chemistry , crown ether , magnesium , potassium , inorganic chemistry , calcium , ionophore , lithium (medication) , sodium , ether , selectivity , nuclear chemistry , organic chemistry , ion , catalysis , medicine , endocrinology
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, calcium, 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.