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MEASUREMENTS AND ANALYSIS OF CONCENTRATIONS OF GASEOUS HYDROGEN PEROXIDE AND RELATED
 

Summary: MEASUREMENTS AND ANALYSIS OF CONCENTRATIONS
OF GASEOUS HYDROGEN PEROXIDE AND RELATED
SPECIES IN THE RURAL CENTRAL PIEDMONT
REGION OF NORTH CAROLINA
Abstract An~hcnl c~lnc`cntrull~>n~ of pL~\-phasc 1~>11;11pcru\ide\ and h>drogcn per<,\lde \rerc measured
during mid-Jul> IC) mid-.Aup\t IYY I. and during June ;lnd carI> July. IYY! ;I[ ;I rural SIIC. SONIA, in the
rural Ccnlr;il Prcdmon~ rcfiun of North Cnrolrna ;,I 9 part of the Southern Oxrdants Study. Srmultaneous
mcasurcments i\\crc also made of trace gases and mrteoroloprcal parameters. The measurements of
hydrogen pero\rdc were made in order tcj c\plorc' the hsha\rour of thus photuchcmrcal oxrdant rn rural
southca.,t Ll S.. 2nd I<) study rts correlation 1~1thozone and meteorology. HzOz showed a pronounced
diurrml varrutron wrth peal, conccntratrons during the afternoon (I X~ 1600 EST). The maximum H20Z
concentrations ohserved were %2.2 ppb\ durrng the IYYI intensrve. and % 1.6 ppbv during 1992. The mean
daytime HLOr concentratmns observed uerc 0.64~0.56 pphv durrng 1991. and 0.57iO.36 ppbv during
1991. which were found to he signrlicantly hrghcr tat the Y5"(,confidence level) than the nighttrme averages
( - 0.15 pphvl. HO, radical concentration of - IJ pphv ~`9s determrned from calculated HzOz production
rates. On occasron hrgh levels ofnighttrme H,02 was observed which was found to be associated with the
hreahdo\rn in the stahrlrty of the nocturnal boundary layer. A JX h hack trajectory analysis performed on
the air massesarrr\rng at Site SONIA mdrcated that srgnrlicant amounts of pollutants could he transported
to thus rural SIICfrom the surroundrng urban arc;rs and thus could all&t the H,O, levels at this site. An
observational based statistIcal analysis ~,as performed. The results ofcorrelstron matrrces show that H202

  

Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University

 

Collections: Environmental Sciences and Ecology; Geosciences