25 1001 Brian Heikes University of Rhode Island HPLC Peroxides From Coil Collection SONEX 1 1 1997 10 09 1997 10 11 0 mid-time of sample in UT (s) 4 1.0 1.0 1.0 1.0 999999 999999 99999 99999 start-time of sample in UT (s) end-time of sample in UT (s) H2O2 (pptv) CH3OOH (pptv) 3 preliminary data for in-field exchange only reported data is not positive definite negative values denote lower limit of detection or upper limit of detection 4 Peroxide measurements used the method of Lee et al., JAOTech., 1995. data below detection limit ( 50 pptv ) reported as -888 data greater than that which is recordable is reported as -777 mid start stop h2o2 ch3ooh 47310 47160 47460 261 140 47610 47460 47760 345 240 47910 47760 48060 337 185 48210 48060 48360 226 -888 48510 48360 48660 161 -888 48810 48660 48960 157 51 49110 48960 49260 153 -888 49410 49260 49560 154 -888 49710 49560 49860 157 -888 53310 53160 53460 531 -888 53610 53460 53760 437 -888 53910 53760 54060 376 -888 54210 54060 54360 513 -888 54510 54360 54660 490 53 54830 54660 55000 395 75 55130 55000 55260 408 69 55410 55260 55560 370 75 55860 55560 56160 377 -888 56310 56160 56460 372 57 56610 56460 56760 357 53 59010 58860 59160 376 59 59310 59160 59460 364 -888 59610 59460 59760 366 55 59910 59760 60060 357 70 60210 60060 60360 229 296 60510 60360 60660 237 -888 60810 60660 60960 109 -888 61110 60960 61260 119 -888 61410 61260 61560 113 -888 61710 61560 61860 96 -888 62010 61860 62160 96 -888 62310 62160 62460 54 -888 62610 62460 62760 64 -888 62910 62760 63060 224 -888 63285 63060 63510 135 -888 63585 63510 63660 133 -888 63810 63660 63960 -888 -888 64110 63960 64260 -888 -888 66210 66060 66360 237 -888 66510 66360 66660 206 -888 66810 66660 66960 316 -888 67110 66960 67260 333 69 67410 67260 67560 298 -888 67710 67560 67860 320 105 68010 67860 68160 454 161 68310 68160 68460 596 161 68610 68460 68760 495 148 68910 68760 69060 390 166 69210 69060 69360 459 158 69510 69360 69660 480 154 69810 69660 69960 484 160