Rate constants for the gas-phase reactions of phenanthrene with OH radicals, NO3 radicals, and 0 3 have been determined at 296 f 2 K and atmospheric pressure of air. The rate constants obtained (in cm3 molecule-' s-l units)were (1.27 f 0.23) X lo-" for the OH radical reaction, (1.2 f 0.4) X 10-13 for the NO3 radical reaction under atmospheric conditions, and (4.0 f 1.0) X for the 0 3 reaction. These rate constank3 indicate that the OH radical and NO3 radical reactions will be the dominant atmospheric loss processes for phenanthrene and that the overall atmospheric lifetime of gas-phase phenanthrene will be 51 day. Mutagenicity bioassays and chemical analyses of the products of the NO3 radical reaction and NO,-air photooxidation of phenanthrene were also conducted.

No abstract

No abstract

No abstract

No abstract