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Abstract: The hydroxyl radical (•OH) is one of the most important oxidizing species in air whose concentration indicates the air quality. In this work, an indirect method was developed to determine •OH based on the electrochemical signal of 2,5-dihydroxybenzoic acid (2,5-DHBA), a specific reaction product of salicylic acid and •OH. The molecular imprinting technique was introduced into this work to improve the selectivity and sensitivity of this method. 2,5-DHBA was imprinted on reduced graphene oxide (rGO) via a simple electrochemical method by using pyrrole as the functional monomer. rGO not only provides abundant active sites for 2,5-DHBA imprinting but also improves the conductivity and mass transportation and increases the accessibility of active sites for 2,5-DHBA recognition. The differential pulse voltammetry (DPV) signals of 2,5-DHBA were used to evaluate the performance of the molecularly imprinted polymer (MIP) based sensor. The linear range for the concentration of 2,5-DHBA was from 5.0 × 10-8 to 4.5 × 10-5 M and the detection limit was down to 2.74 × 10-9 M. A linearity for •OH concentration ranging from 8.4 × 10^6 to 7.5 × 10^9 molecules per cm3 was obtained. The low detection limit for •OH was down to 4.6 × 10^5 molecules per cm3 when using this sensor. The atmospheric •OH concentration in Yangzhou has been successfully detected by this method. This work extended the molecularly imprinted polymers to the indirect detection of •OH in the atmosphere with a simplified sample collection and detection process and good sensitivity
Template and target information: 2,5-dihydroxybenzoic acid, 2,5-DHBA