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Enseco CoRNiNG oom , DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: ICP-A Matrix: AQUEOUS QC Lot: 05 DEC 89-B Concentration Units: mg/L Aluminum 2.00 1 .89 1 .92 1 .90 95 85-115 1 .6 10 Antimony 0.50 0.465 0.484 0.474 95 85-115 4.0 10 Arsenic 2.0 1 .91 1.94 1 .92 96 85-115 1 .6 10 Barium 2.0 1.99 2.06 2.02 101 85-115 3.5 10 Beryllium 0.050 0.0490 0.0530 0.0510 102 80-115 7.8 10 Boron 1 .0 0.960 0.990 0.975 98 85-115 3. 1 10 Cadmium 0.050 0.0480 0.0490 0.0485 97 80-117 2. 1 10 Calcium 100 100 104 102 102 85-115 2.9 10 Chromium 0.20 0.203 0.209 0.206 103 85-115 2.9 10 Cobalt 0.50 0.482 0.494 0.488 98 85-115 2.5 10 Copper 0.25 0.254 0.263 0.258 103 85-115 3. 5 10 Iron 1 .0 0.978 1 .01 0.994 99 85-115 3.2 10 Lead 0.50 0.486 0.501 0.494 99 85-115 3.0 10 Lithium 0.20 0. 198 0.204 0.201 101 85-115 3.0 10 Magnesium 50 48.7 50.0 49.4 99 85-115 2.6 10 Manganese 0.50 0.473 0.486 0.480 96 85-115 2. 7 10 Molybdenum 0.20 0.187 0. 195 0. 191 96 85-115 4.2 10 Nickel 0.50 0.501 0.486 0.494 99 83-115 3.0 10 Potassium 50 48.8 50.1 49.4 99 83-115 2.6 10 Selenium 2.0 1 .93 2.01 1 .97 99 85-115 4. 1 10 Silver 0.050 0.0440 0.0430 0.0435 87 56-116 2.3 35 Sodium 100 98. 1 102 99.9 100 85-115 3.6 10 Thallium 2.0 1.97 1 .98 1 .98 99 84-118 0.5 10 Tin 0.40 0.351 0.373 0.362 91 80-115 6. 1 15 Titanium 0.20 0. 193 0.200 0.196 98 85-115 3.6 10 Vanadium 0.50 0.479 0.490 0.484 97 82-115 2.3 20 Zinc 0.50 0.476 0.488 0.482 96 80-115 2.5 20 Category: PB-FAA-A Matrix: AQUEOUS QC Lot: 05 DEC 89-B Concentration Units: mg/L Lead 0.020 0.0203 0.0203 0.0203 101 82-115 0.0 11 Calculations are performed before rounding to avoid round-off errors in calculated results.