Issue 2, 1987

Electrode membrane and solvent extraction parameters relating to the potentiometry of polyalkoxylates

Abstract

Poly(vinyl chloride)(PVC) matrix membrane electrodes containing various amounts and compositions of liquid ion-exchanger were studied in order to investigate their response to aqueous solutions of Antarox CO-880 as a model polyalkoxylate. The liquid ion-exchanger used in the membrane was based on solutions in 2-nitrophenyl phenyl ether of the tetraphenylborates of complexes with barium of either Antarox CO-880 or Antarox CO-430 polyethoxylates. Barium ion-responses were also noted.

The electrodes recommended for use with polyalkoxylates in aqueous solutions are formed from an Antarox CO-430 based liquid ion-exchanger. The master membrane used for making the electrodes should consist of 0.40 g of the liquid ion-exchanger in 0.17 g of PVC, that is 70% of sensor in 30% of the immobilising polymer.

Neither Antarox CO-430 (Series A) nor Antarox CO-880 (Series B) type electrodes respond to the methyl glucoside polypropoxylates Glucam P10 and P20, but, conversely, Glucam P10 and P20 (Series C) type electrodes respond more effectively to Antarox CO-880 polyethoxylate in aqueous solution than they do to either of the propoxylates. This and the better response to Glucam P20 compared with Glucam P10 is consistent with the relative stability of metal-polyalkoxylate complexes according to data obtained on the solvent extraction of metal ions into dichloromethane by the polyalkoxylates, based on studies of the large polarisable picrate and dipicrylamine anions.

Solvent extraction data show that the complexing tendencies of the various polyalkoxylates studied with barium, magnesium and zinc ions are generally in the order of Antarox CO-730 > PEG 1500 > Antarox CO-880 > Glucam P20 > Glucam P10 > Antarox CO-430. There is a correlation between these and electrode qualities for cations and also with regard to the response of these electrodes towards alkoxylates. However, other factors can also be involved such as those impressed by the substituent tail attached to the end of the alkoxylate chain.

Article information

Article type
Paper

Analyst, 1987,112, 113-120

Electrode membrane and solvent extraction parameters relating to the potentiometry of polyalkoxylates

P. H. V. Alexander, G. J. Moody and J. D. R. Thomas, Analyst, 1987, 112, 113 DOI: 10.1039/AN9871200113

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