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Enseco <br /> A CORNING Company <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: ICP-AT <br /> Matrix: AQUEOUS <br /> QC Lot: 28 JUN 90-A <br /> Concentration Units: mg/L <br /> Aluminum 2.00 1 .84 1 .84 1 .84 92 85-115 0. 1 10 <br /> Antimony 0.50 0.467 0.467 0.467 93 85-115 0. 1 10 <br /> Arsenic 2.0 1 .90 1 .90 1 .90 95 85-115 0.0 10 <br /> Barium 2.0 1 .92 1 .91 1 .91 96 85-115 0.4 10 <br /> Beryllium 0.050 0.0516 0.0512 0.0514 103 80-115 0.7 10 <br /> Boron 1 .0 0.918 0.950 0.934 93 85-115 3.3 10 <br /> Cadmium 0.050 0.0480 0.0453 0.0467 93 80-117 5.9 10 <br /> Calcium 100 93.2 93.3 93.3 93 85-115 0. 1 10 <br /> Chromium 0.20 0. 193 0. 193 0. 193 97 85-115 0.0 10 <br /> Cobalt 0.50 0.467 0.466 0.467 93 85-115 0.2 10 <br /> Copper 0.25 0.259 0.256 0.258 103 85-115 1 .2 10 <br /> Iron 1 .0 0.946 0.940 0.943 94 85-115 0.6 10 <br /> Lead 0.50 0.471 0.478 0.474 95 85-115 1 .4 10 <br /> Lithium 0.20 0. 190 0. 188 0. 189 94 85-115 1 .2 10 <br /> Magnesium 50 47.7 47.7 47.7 95 85-115 0.0 10 <br /> Manganese 0.50 0.461 0.458 0.460 92 85-115 0.7 10 <br /> Molybdenum 0.20 0. 185 0. 185 0. 185 92 85-115 0.3 10 <br /> Nickel 0.50 0.457 0.465 0.461 92 83-115 1 .8 10 <br /> Potassium 50 47.4 47.7 47.6 95 83-115 0.5 10 <br /> Selenium 2.0 1 .96 1 .94 1 .95 98 85-115 1 .0 10 <br /> Silver 0.050 0.0416 0.0414 0.0415 83 56-116 0.5 35 <br /> Sodium 100 95.9 96.2 96. 1 96 85-115 0.3 10 <br /> Thallium 2.0 1 .90 1 .91 1 .90 95 84-118 0.5 10 <br /> Tin 0.40 0.353 0.353 0.353 88 80-115 0.0 15 <br /> Titanium 0.20 0. 179 0. 179 0. 179 89 85-115 0. 1 10 <br /> Vanadium 0.50 0.460 0.458 0.459 92 82-115 0.4 20 <br /> Zinc 0.50 0.495 0.488 0.491 98 80-115 1 .3 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br />