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Determination of water-soluble nitrate ions in PM2.5 particles using UiO-67 modified glassy carbon electrode

NO 3- is the main component of PM2.5. NO 3- will be converted into carcinogenic and teratogenic nitrite by microorganisms in the intestine after ingestion by human body. Therefore, it is particularly important to establish a rapid, sensitive, simple and accurate NO 3- detection method. This work used UiO-67 directly as an electrode material to construct a UiO-67/glass carbon electrode (GCE) sensor. The work carefully investigated its electrochemical detection of NO 3- in PM2.5. Its current response to NO 3- was explored by cyclic voltammetry (CV), and a pair of reversible redox peaks was found. The work explored the effects of pH and interfering species on the sensing performance. The results showed that the differential pulse voltammetry (DPV) detected NO 3- in the linear range of 6.67×10 -6 ~2.00×10 -4 M at UiO-67/CCE with a detection limit of 2 μM. The sensor was successfully used for the detection of actual atmospheric PM 2.5 samples.