In this study, a simple and sensitive method for the determination of nitrite (NO₂⁻) 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.

在这项研究中，亚硝酸盐的测定简单和灵敏的方法（NO ₂ ^-）在环境和食品样品中使用六氰合铁酸镍/聚（2,6-二氨基吡啶）（NiHCF / PDAP）杂化修饰电极开发了安培法。由于NiHCF的高电催化活性和PDAP在酸性条件下的预浓缩能力，通过一种简便的一步式电合成方法制备的NiHCF / PDAP杂化物对亚硝酸盐的测定显示出显着的高灵敏度和宽线性范围。此外，所制备的NiHCF / PDAP还具有较高的选择性，且不受其他阴离子的干扰，具有较高的稳定性和亚硝酸根测定方法的重现性。最后，将开发的杂种应用于自来水，湖水和火腿肠样品中亚硝酸盐的测定，结果证明了其作为亚硝酸盐灵敏且选择性电化学传感器的潜力。