Study of atmospheric peroxides in Guangzhou city.

Five species of atmospheric peroxides were measured with high performa nce liquid chromatograph (HPLC) fluorescent method at Guanghou city in July and October of 1998, including H2O2, methyl hydroperoxide (MHP), ethyl hydroperoxide (EHP), hydroxymethyl hydroperoxide (HMHP) and 1-hydroxyethyl hydroperoxide (1-H EHP). H2O2, HMHP and MHP were the main peroxides detected with the maximum conce ntration of 1.6(10-9, 0.67(10-9 and 0.54( 10-9 (V/V) respectively. Under the con dition of high radiation and low humidity, diurnal variation of H2O2 and MHP con centration was observed being lower in morning and night and highest at 14:00~16 :00. Meteorological parameters and other trace gas concentrations were measured at the same time, which showed that the concentration of H2O2 and MHP had defini te positive correlation with O3, atmospheric temperature and ultraviolet radiati on(UVB); and negative correlation with NOX、SO2 and relative humidity.