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Lab Nc. 32147 -2- <br />�k <br /> Included is the data from an experiirent we ran to explain the low NO3 values. <br /> 1 * <br /> Each sample was spiked with enough NO3 to raise its NO3 level 89 mg/L. <br /> The samples were left in closed jars at room temperature for 3 days. <br /> At the end of that time, the samples were analyzed to determine the NO3 <br /> concentration. <br /> In addition, I ran TYN tests on the original samples and the final spiked <br /> samples after 3 days to determine if any of the NO3 had been converted to <br /> NH3 or Organic N. (only samples -1, -2 were run) <br /> Sample 3 did not exhibit NO decrease different from the control. Since this <br /> was the only sample that dia not exhibit a strong "septic odor" it can be i <br /> surmised that some unknown factor rendered any organisms present incapable of <br /> NO3 utilization. <br /> Conclusion: NO- is being both destroyed and incorporated into septic biomass. <br /> Together this would probably account for low NO3 levels in septic samples given <br /> significant NO3 inputs. <br /> Y * - Less Than <br /> -{ If there are questions, please call or write. <br /> Very truly yours, <br /> i F, Quirm, Ph.D. <br /> Laboratory Director <br /> J'4:7gd <br /> i <br /> l �. <br />