Results of Hg Speciation Testing on the 2Q18 Tank 50 Sample

Total Mercury Analysis Comparison: Deployment of Analytical Method for the Savannah River Site Liquid Waste System

“…After DMA containment in December, fourth quarter 2018 tank 50 samples were the first set analyzed in-house by the DMA instead of the CVAAS and reported to the Laboratory Information Management System (LIMS). These results compared to an offsite laboratory 34 (61.7 mg/L %RSD 4.6 for n = 3) and to our facility 17 (61.9 mg/L %RSD 0.28 for n = 3) found a % difference ((outside lab -DMA)/(outside lab + DMA)/2 *100) of 0.32%. The first quarter 2019 tank 50 analytical total Hg result (59.8 mg Hg/L %RSD 0.580 n = 3) from our MDA instrument and an offsite laboratory 35 (67.4 mg Hg/L %RSD 5.6 n = 3) also were within our ± 20% (2) uncertainty band with a % difference of 11.9 %.…”

Results for the Fourth Quarter Calendar Year 2018 Tank 50 Salt Solution Sample

“…Similarly, SRNL analysis of monomethyl mercury indicates a monomethyl mercury average value of 21.7 mg/L compared to the Eurofins average value of 20.2 mg monomethyl mercury/L that is calculated from the reported monomethyl mercury of 18.8 mg Hg/L. 13 Analyzed radionuclide concentrations and the respective radiochemical analysis methods, their standard deviations and their corresponding WAC Limits and Targets are shown in Table 3-3 and Table 3-4, respectively. These tables correspond to Attachment 8.3 Limits and Attachment 8.4 Targets, respectively, from the WAC.…”

Evaluation of the Current State of Knowledge for Thermolysis of Organics within SRS Waste Forming Volatile Organic Compounds (VOCs)

“…Organo-mercury compounds have been identified in SRS Tank Farm samples in recent studies. 40,41,42,43,44 Methyl mercury is confirmed present in Tank 50 supernate at concentrations up to 60 mg/L. 42 Both dimethyl mercury and ethyl mercury are typically below 1 mg/L; for instance, the 3 rd quarter 2017 Tank 50 supernate showed < 0.17 mg/L Hg as ethyl mercury and 0.062 mg/L Hg as dimethyl mercury.…”