Journal
MICROCHIMICA ACTA
Volume 151, Issue 1-2, Pages 109-113Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-005-0389-5
Keywords
Aliquat 336S-saccharinate ion-pair; PVC membrane; potentiometry; saccharin determination
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A potentiometric poly(vinyl chloride) membrane sensor for determination of saccharin is described. It is based on the use of Aliquat 336S-saccharinate ion-pair as an electroactive material in plasticized PVC membranes with o-nitrophenyloctylether or dioctylphthalate. The sensor is conditioned for at least two days in 0.1mol L-1 sodium saccharinate before use. It exhibits fast, stable and Nernstian response for saccharinate ions over the concentration range of 1.0 x 10(-1) - 5.0 x 10(-5) mol L-1 and pH range of 4.5-11. The sensor is used for determination of saccharin in some dosage forms. Results with an average recovery of 101% and a mean standard deviation of 0.2% are obtained which is compared favourably with data obtained using the British pharmacopoeia method. The sensor shows reasonable selectivity towards saccharin in presence of many anions and natural sweeteners.
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