Document 15xwDBwMDkr6g0kQEGd82KYYq

ABD00069595 Technical Service Report Report No- 471-80-848-1 Conoco Inc. Research and Development Department Analytical Research Section Ponca City. Oklahoma To Richard A. Frohreich - ... . U iJ . . l vi u '-u From Date Jana L. Florea December 1, 1980 THIS DOCUMENT i?, OCsNFiOEHTlAL } ANU Tr'E PROPERTY OF CONOCO iiVO. ! Subject EPA VARIANCE REQUEST: THE EFFECT OF SAMPLE STORAGE TIME ON RESIDUAL VCM CONTENT OF PVC SLURRY Object To conduct a study to determine if PVC wetcake samples can be stored for longer than 24 hours without a statistically sig nificant loss of VCM. Conclusion Analysis of the data showed no statistical evidence that residual VCM was lost when PVC wetcake was stored for five days. Discussion The samples were collected and prepared at the Aberdeen Chemical Plant September 22, 1980. Twenty-three 8-oz bottles of PVC slurry were col lected in rapid succession during a reactor dump. The bottles were taken to the laboratory where five were randomly chosen from the set and placed in the refrigerator at 40F to cool to room temperature. When the bot tles had cooled sufficiently, the laboratory personnel prepared five wet cake samples from each of the five bottles according to EPA Method 107. The vials were stored in the refrigerator and a set of five vials, one from each of the five bottles, was analyzed each day for five days using the F-42 Headspace Analyzing Chromatograph according to EPA Method 107. The residual VCM concentrations obtained over the five-day period are shown, in wppm on a dry resin basis, in Table I. The Spearman's rank coefficient for the data in Table I is 0.1. This is hot statistically significant; a coefficient less than -0.9 would indicate a significant VCM loss. Jana L. Florea Chemist Analytical Research Section BW Attachment Copies to FK EAS DEC ELS Lib. - Ponca City CuM, RJ, DC - Aberdeen