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Abstract(s)
A flow injection analysis (FIA) system comprising
a tartrate- (TAT) selective electrode has been developed
for determination of tartaric acid in wines. Several
electrodes constructed for this purpose had a PVC
membrane with a complex of quaternary ammonium and
TAT as anion exchanger, a phenol derivative as additive,
and a more or less polar mediator solvent. Characterization
of the electrodes showed behavior was best for membranes
with o-nitrophenyl octyl ether as solvent. On injection
of 500 μL into a phosphate buffer carrier (pH = 3.1;
ionic strength 10–2 mol/L) flowing at 3 mL/min, the slope
was 58.06 ± 0.6 with a lower limit of linear range of 5.0 ×
10–4 mol/L TAT and R2 = 0.9989. The interference of several
species, e.g. chloride, bromide, iodide, nitrate, gallic
acid, tannin, sucrose, glucose, fructose, acetate, and citrate,
was evaluated in terms of potentiometric selectivity
coefficients. The Hofmeister series was followed for inorganic
species and the most interfering organic ion was citrate.
When red and white wines were analyzed and the results
compared with those from an independent method
they were found to be accurate, with relative standard deviations
below 5.0%.
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Springer-Verlag