Facile electrosynthesis of nickel hexacyanoferrate/poly(2,6-diaminopyridine) hybrids as highly sensitive nitrite sensor

In this study, a simple and sensitive method for the determination of nitrite (NO 2 − ) in environmental and food samples by amperometry with nickel hexacyanoferrate/poly(2,6-diaminopyridine) (NiHCF/PDAP) hybrids modified electrode was developed. The NiHCF/PDAP hybrids prepared via a facile one-step electrosynthesis method exhibited significantly high sensitivity and wide linear range for the determination of nitrite due to the high electrocatalytic activity of NiHCF and the preconcentration ability of PDAP in acidic conditions. In addition, the as-prepared NiHCF/PDAP also showed high selectivity with no interferences from other anions, high stability and reproducibility in the determination of nitrite. Finally, the developed hybrids were applied in the determination of nitrite in tap water, lake water and ham sausage samples, and the results demonstrated its potential as a sensitive and selective electrochemical sensor for nitrite.