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A liquid-membrane type nitrate-selective electrode was improved to lower the influence of contaminants by modifying its inner electrode system from Ag|AgCl|Clto Ag|Ag + . The NO3 --selective electrode displayed a linear response to the concentration of NO3with a Nernstian slope of -53 ± 1 mV decade -1 , in the concentration region between 10 -5 and 2 mol dm -3 (M). The NO3detection limit was about 10 -5 M. The electrochemical response of this electrode was stable for more than 30 days. Thedoi:10.2116/analsci.20p323 pmid:33132233 fatcat:cago7hyod5bkpa3frzzmgyuwxy