THE NEAR-UV ABSORPTION CONSTANTS FOR NITRITE ION IN AQUEOUS-SOLUTION

The UV decadic molar absorptivities of nitrite ion in water were deter mined between 290 and 400 nm in 2-nm increments. The measured maximum absorptivity of 22.93 M cm(-1) at 354 nm is in agreement with previous results. Using absorptivities obtained in this wavelength range, we c alculated the first-order rate constant for the formation of OH radica ls by the photolysis of aqueous nitrite in summer noon sunlight at 40 degrees N. The resulted rate constants, 5.2 x 10(-5) s(-1) for surface water and 1.04 x 10(-4) s(-1) for cloud and rain water droplets, are twice the previously reported values. The environmental significance o f these results is discussed briefly. (C) 1997 Elsevier Science Ltd.