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Potentiometric selectivity study of crown ethers containing four ring oxygen atoms and benzoxymethyl or carboxylic acid side chains as ionophores for lithium and potassium
Author(s) -
Attiyat Abdulrahman S.,
Christian Gary D.,
Bartsch Richard A.
Publication year - 1989
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.1140010110
Subject(s) - chemistry , potentiometric titration , inorganic chemistry , lithium (medication) , potassium , crown ether , side chain , selectivity , ether , trioctylphosphine oxide , carboxylic acid , sodium , ion , organic chemistry , catalysis , extraction (chemistry) , endocrinology , polymer , medicine
Five crown ethers with four ring oxygen atoms and different types of pendant groups were used to prepare ion‐selective electrodes by coating a membrane containing the crown ether on the tip of a silver wire incorporated in a flow cell. A flow injection analysis study was conducted to determine the potentiometric selectivities of the crown ethers for lithium, sodium, potassium, magnesium, and calcium ions. It was found that crown ethers with neutral side arms show selectivities for lithium over other ions, while those of acidic side arms show selectivities for potassium over the other ions. The effect of the addition of trioctylphosphine oxide to the electrode matrix was also investigated. A comparison is made between the potentiometric selectivities of the crown ethers for certain metal ions and their selectivities in extracting the ions into an organic phase.