▎ 摘　　要

In this communication, a sensitive electrochemical nitrite sensor was constructed based on poly (diallyldimethylammonium chloride) (PDDA) functionalized reduced graphene oxide (PDDA-rGO). The preparation of PDDA-rGO is quite facile, and the PDDA-rGO exhibits good dispersity and high stability in water, together with good conductivity and positive surface charge. All these factors lead to a greatly enhanced catalysis of PDDA-rGO for the nitrite oxidation compared with that of unmodified rGO or bare glassy carbon electrode. Based on PDDA-rGO, an electrochemical nitrite sensor with low overpotential (0.75 V), wide linear range (0.5 mu M-2 mM), low detection limit (0.2 mu M), good stability and selectivity was fabricated, which exhibited satisfied recovery for detecting nitrite in drinking water. (C) 2014 Elsevier B.V. All rights reserved.