The present invention relates to a nitrate sensor. More specifically it relates to nitrate sensor with polymeric membrane and photocurable component. The sensor having covalently bonded lipophilic ammonium salt and methyl-methacrylate and tetrahydrofurfuryl acrylate photo-polymerized co-polymer. Also provided a process for producing a nitrate ion selective electrode (ISE) sensor with tridodecyl-11 -acrylundecyl ammonium bromide salt with 2 parts of methyl-methacrylate and 8 parts of tetrahydrofurfuryl acrylate and a process for producing a nitrate ion selective electrode (ISE) sensor with tetraoctyl ammonium nitrate (TOAN) and low impedance monomer with 2 parts of methyl-methacrylate and 8 parts of tetrahydrofurfuryl acrylate.
