Document 3ewYawk1VEzBDXzvED40m11K6

Joe Ware r s 11. A Interoffice Communication From: Date: Subject: D. S. Cox 23 October 1986 MEASUREMENT OF VARIATION ON LOW RVCM RESIN An experiment was set up to determine the variation in the RVCM analysis when very low samples were tested. This information is needed as customers are requesting our resin to have low RVCM values. A 5305 resin sample was taken from a regular drier sample and weighed into HS-100 sample vials. One set of 40 had 2 grams of resin and the other set contained 4 grams of resin, all had 50 microliters of water added as specified in the EPA method. These samples were run at the normal conditions of 90 degrees cook temperature and 60 minutes cook time. No significant difference would be seen due to sample size. For all samples, the maximum was 127 ppb (0.127 ppm) and the minimum was 54 ppb (0.054 ppm). The average value was 86 ppb (0.086 ppm) with a standard deviation of 13. The relative error was 15%, only one sample was greater than the 3 sigma control limits. The precision is considered good for this level of RVCM. The run data is shown below and a plot of the data is attached. i PPB RVCM DATA FOR 2 GRAM SAMPLE 76 71 70 75 82 78 78 101 69 75 121 68 83 94 64 92 99 80 84 68 65 113 77 72 103 98 88 94 78 111 94 103 102 106 118 93 119 115 100 83 . PPB RVCM DATA FOR 4 GRAM SAMPLE 86 77 76 90 74 92 76 87 96 121 122 77 64 67 65 75 79 80 77 54 68 70 83 86 81 74 92 85 92 83 97 75 64 69 67 85 81 82 94 127 David S. Cox CC JF DH JEW n ;i - - hi I-. -p* p. if-!-' - i VAB.0001103914 ... ,, +. i' tm. .i.. -i m-.hi- i -*fo -PP'E.^V' S*'- lI'T* 1 A PPB RVCM VAB.OOOl 103915 DRY RESIN ANALYSIS BY HS-100