Abstract
Liquid and poly(vinyl chloride) membrane electrodes that are highly selective and sensitive to benzene-1,2,4-tricarboxylic acid (trimellitic acid) were developed. Both electrodes exhibit a linear response in the range 10–1–10–5M over the pH range 6–9 with a near-Nernstian slope of 27–28 mV per concentration decade at 25 °C. As little as 1 mg ml–1 of trimellitic acid can be measured directly with an average recovery of 98.7%(standard deviation 1.8%) and without interference from many organic acids and inorganic anions.
Published Version
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