Document qa7xQVLeo5GnZomyXz4en0pdq

AR226-2447 vS TT" w't>. BRANDEHA AT A1 AT EU0IS2 08/08/97 04:59 PM To; ZIPFEL AT A1 AT WWPS cc: CHAPMAGA AT A1 AT WWPS , AL, MORGANRA AT A l AT WWPS , KRONBERG AT A1 AT WWPS , HEERC AT A l AT EUOIS2 , MAASJP AT A1 AT WWPS , DAUBEC AT A1 AT WWPS Subject: RE: Can you help explain the attached Roger, Jason, I presume your numbers are on dry PEP basis J in 1995 and 1996 we analyzed C-8 in PEP 9302 at the V-disk. years 1995 frequency every hour C-8 ppm 349, 285, 411, 221 (dry basis ?) years 1996 frequency every half hour C--8 ppm 332, 284, 218, 249, 481, 555, 580, 392 (dry basis ) solids % 88.6, 93.9, 84.7, 78.4, 89.1, 89.4, 89.2, 92.0 After that we improved our analytical methods drastically and found date 24-6-97 type 100-tG 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 BCD 3191, 3312, 3590, 3392, 3197 date 16-7-97 type 5100--N frequency every 20 minutes solids 70.7, 70.2, 69.8, 72.1, 71.2 C-8 Me-bl 3396, 3499, 3026, 3243, 3267 C-8 BCD 2967, 3204, 3160, 3152, 3276 We found it is VERY VERY important to be in the linear range of the BCD detector. We diluted the extracted solutions 200 times to achieve that. An ECD has a rather short linear range. You should cheek 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 was blamed by some people. As you can see the BCD gives slightly lower results, probably there are still some in-situ surfactants in the wet fluff, which are seen by Me-blue but not by ECD, We don't have the variations anymore that we used to see, I don't know why, but there were quite some process RJZ012208 EID936987 f' \ changes since early 1996. One trick yon can do is to reanalyze in a random order, to see if moment of analyzing was a factor. good luck, Rik EID936988 R J Z O 12209