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A Enseco <br /> A Coming Companv <br /> DUPLICATE CONTROL SAMPLE REPORT <br /> Metals Analysis and Preparation <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average(%) (RPD) <br /> DCS1 DCS2 AVG DCS Limits DCS Limit <br /> Category: PB-FAA-AD <br /> Matrix: AQUEOUS <br /> QC Lot: 04 NOV 92-Y <br /> Concentration Units: mg/L <br /> Lead 0.02 0.0196 0.0200 0.0198 99 75-125 2.0 20 <br /> Category: ICP-AD <br /> Matrix: AQUEOUS <br /> QC Lot: 03 NOV 92-X <br /> Concentration Units: mg/L <br /> Aluminum 2.0 1 .89 1 .90 1 .89 95 85-115 0.7 10 <br /> Antimony 0.5 0.494 0.501 0.498 100 85-115 1 .4 10 <br /> Arsenic 0.5 0.474 0.487 0.481 96 85-115 2.7 10 <br /> Barium 2.0 1 .91 1 .97 1 .94 97 85-115 2.8 10 <br /> Beryllium 0.05 0.0470 0.0495 0.0483 97 80-115 5.0 10 <br /> Cadmium 0.05 0.0466 0.0504 0.0485 97 80-117 7.8 10 <br /> Calcium 100 99.5 103 101 101 85-115 3.0 10 <br /> Chromium 0.2 0. 193 0.200 0. 197 98 85-115 3.4 10 <br /> Cobalt 0.5 0.461 0.475 0.468 94 85-115 3. 1 10 <br /> Copper 0.25 0.249 0.255 0.252 101 85-115 2.5 10 <br /> Iron 1 .0 0.948 0.974 0.961 96 85-115 2.7 10 <br /> Lead 0.5 0.486 0.489 0.487 97 85-115 0.6 10 <br /> Magnesium 50 49. 1 49.8 49.5 99 85-115 1 .6 10 <br /> Manganese 0.5 0.463 0.476 0.470 94 85-115 2.9 10 <br /> Nickel 0.5 0.479 0.501 0.490 98 83-115 4.4 10 <br /> Potassium 50 48.3 49.2 48.8 98 83-115 1 .7 10 <br /> Selenium 2.0 1 .90 1 .94 1 .92 96 85-115 1 .9 10 <br /> Silver 0.05 0.0482 0.0485 0.0484 97 56-116 0.5 35 <br /> Sodium 100 98.3 101 99.6 100 85-115 2.7 10 <br /> Thallium 2.0 2.02 2.05 2.03 102 84-118 1 .5 10 <br /> Tin 4.0 3 .57 3.68 3.62 91 80-115 3.2 15 <br /> Vanadium 0. 5 0.470 0.482 0.476 95 82-115 2.6 20 <br /> Zinc 0. 5 0.490 0.499 0.494 99 80-115 1 .8 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br />