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• • &Lseco 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: 01 JUN 89-A Concentration Units: mg/L Aluminum 2.00 1.90 1.93 1 .92 96 85-115 1.6 10 Antimony 0.50 0.498 0.487 0.492 99 85-115 2.2 10 Arsenic 2.0 1 .95 2.01 1.98 99 85-115 3.0 10 Barium 2.0 1.96 1 .96 1.96 98 85-115 0.0 10 Beryllium 0.050 0.0506 0.0497 0.0502 100 80-115 1 .8 10 Boron 1.0 0.960 0.970 0.965 97 85-115 1.0 10 Cadmium 0.050 0.0497 0.0505 0.0501 100 80-117 1.6 10 Calcium 100 98.1 98.8 98.4 98 85-115 0.7 10 Chromium 0.20 0.187 0.191 0.189 95 85-115 2.1 10 Cobalt 0.50 0.484 0.482 0.483 97 85-115 0.4 10 Copper 0.25 0.249 0.249 0.249 100 85-115 0.0 10 Iron 1.0 0.972 0.983 0.978 98 85-115 1.1 10 Lead 0.50 0.480 0.456 0.468 94 85-115 5. 1 10 Lithium 0.20 0. 173 0.172 0.172 86 85-115 0.6 10 Magnesium 50 47.4 47.4 47.4 95 85-115 0.0 10 Manganese 0.50 0.484 0.481 0.482 97 85-115 0.6 10 Molybdenum 0.20 0.178 0.181 0.180 90 85-115 1.7 10 Nickel 0.50 0.495 0.486 0.490 98 83-115 1 .8 10 Potassium 50 42.2 42.4 42.3 85 83-115 0.5 10 Selenium 2.0 1.67 2.02 1.84 92 85-115 19 10 Silver 0.050 0.0455 0.0477 0.0466 93 56-116 4.7 35 Sodium 100 93.8 93.3 93.6 94 85-115 0.5 10 Thallium 2.0 1.94 1.96 1.95 98 84-118 1 .0 10 Tin 0.40 0.401 0.376 0.388 97 80-115 6.4 15 Titanium 0.20 0.193 0.193 0. 193 97 85-115 0.0 10 Vanadium 0.50 0.473 0.476 0.474 95 82-115 0.6 20 Zinc 0.50 0.479 0.479 0.479 96 80-115 0.0 20 Category: PB-FAA-A Matrix: AQUEOUS QC Lot: 01 JUN 89-A Concentration Units: mg/L Lead 0.020 0.0193 0.0193 0.0193 97 82-115 0.0 11 Calculations are performed before rounding to avoid round-off errors in calculated results.