Document zQgLLzdk8xRBvKzgJJNEMGyL3

Inter-Office Memo s A TENNEOO CHEMICALS, INC. To C. W. Johnston At Flemlngton Date August 5, 1969 From Subject H. B. Carr At Burlington Copy to D.M. Water Testing Reference: Memo: C. W. Johnston to H. B. Carr, dated 7/29/69, titled, "June Monthly Report" Project No.: 70-001 J. C. Fisher F. W. Kanzler M. C. Spalding M. W. Williams In the referenced memo, you raised some interesting questions pertaining to the program initiated by Quality Control to monitor the demineralized water system in Burl ington. A detailed report is being prepared by Quality Control that will define test methods, sampling points and sampling frequency. However, in answer to your particular questions. Quality Control is doing the following: 1. For iron testing, two separate tests are employed. In the first, all iron Is reduced to ferrous for color development and determination (total iron). In the other test, ferrous is determined directly. Ferric is determined by difference. It is agreed that ferrous iron Is more important as far as the polymerization is concerned. However, ferric is also important in its effect on heat stability; probably through a FriedalCraft mechanism as you suggest. The rule utilized, at present, is that for an iron content greater than one part per million (ppm) both tests are run. Thus far, the Iron level has been in the 0.2 to 0.7 ppm range. 2. A solids content test for the D.M. water will be run. The main source of solids at the D.M. water circulating pumps would be resin slurry that has backed-up into the Service Loop through faulty check valves. HBC/rjl H. B. Carr COLOR!TE 015968