Document MJZoKekbnGXVjD39J0jEogwM

AR226-2447 < ^ j""?1"' BRANDERA AT A1 AT EUOIS2 08/06/97 04:59 PM To; cc: Subject: ZIPPELATA1 ATWWPS CHAPMAOA AT A1 AT WWPS , AL, MOR6ANRA AT A1 AT WWPS , KRONBERG AT A1 AT WWPB , HEERC AT A1 AT EUOIS2 , MAA8JP AT A1 AT WWPS , DAUBEC AT A1 AT WWPS RE: Can you help explain the attached Roger, Jason, I presume your numbers are on. dry FEP basis ? in 1995 and 1996 we analyzed C-8 in FEP 9302 at the V-disH.. yeart 199S frequency every hour C-8 ppm 349, 285, 411, 221 (dry basis ?) year; frecniency C-8 ppm solids % 1996 332, every half hour 284, 218, 249, 481, 555, 88.6, 93.9, 84.7, 78.4, 580, 392 (dj?y basis ) 89.1, 89.4, 89.2, 92.0 After that w improved our analytical methods drastically and found date 24-6--97 type 100-LG frequency every 20 minutes solids 71.4, 67.8, 59.6, 65.8, 45.1 C-8 ppm Me-bl 3282, 3305, 3711, 3465, 3310 C-8 ppm ECD 3191, 3312, 3590, 3392, 3197 date type frequency solids C-8 Me-bl C-8 ECO 16-7-97 5100-H every 70,7, 70.2, 3396, 2967, 3204, 20 minutes 69.8, 72.1, 3499, 3026, 3160, 3152, 71.2 3243, 3276 3267 We found it is VERY VBRY important to be in the linear rang of the BCD detector. We diluted the extracted solutions 200 times to achieve that. An BCD has a rather short linear range. You should check what it is by making a calibration line* If you are above the linear range, you will find far too low results, unless you interpolate in the non-linear area. Also we had a fouled detector, and C-8 wae blamed by some people. As you can eea the BCD gives slightly lower resulta, probably ther are still some in-gitu surfactants in the wet fluff, which are eaan by He-blue but not by BCD. We don't have the variations anymore that we used to see, I don't know why, but there were quite some process EID936987 changes since early 1996. One trick you can do is to reanalyze in a random order, to see if moment; of analyzing was a factor. good luck, Rik EID936988