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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-S <br /> Matrix: SOIL <br /> QC Lot: 18 JUL 91-A <br /> Concentration Units: mg/kg <br /> Aluminum 200 189 191 190 95 84-115 1.0 11 <br /> Antimony 50 49.7 49.2 49.5 99 81-115 1 .0 10 <br /> Arsenic 50 49.6 48.8 49.2 98 82-115 1.6 10 <br /> Barium 200 198 203 200 100 85-115 2.3 10 <br /> Beryllium 5.0 4.90 4.99 4.95 99 70-110 1 .8 10 <br /> Boron 100 98.0 101 99.7 100 85-115 3.3 10 <br /> Cadmium 5 0 4.40 4.54 4.47 89 81-118 3.2 15 <br /> Calcium 10000 9930 10100 10000 100 85-115 2.1 10 <br /> Chromium 20 19.2 19.8 19.5 97 84-115 3.1 17 <br /> Cobalt 50 48.6 49.0 48.8 98 80-115 0.8 10 <br /> Copper 25 25.2 25.5 25.4 101 81-115 1.2 10 <br /> Iron 100 95.3 95.6 95.5 95 85-115 0.3 14 <br /> Lead 50 46.4 47.7 47.0 94 80-115 2.7 11 <br /> Lithium 20.0 19.4 19.7 19.6 98 85-115 1 .3 10 <br /> Magnesium 5000 5090 5180 5140 103 85-115 1 .8 10 <br /> Manganese 50.0 48.3 49.2 48.8 98 80-115 1.9 10 <br /> Molyybdenum 20.0 19.2 19.5 19.4 97 85-115 1 .6 10 <br /> Nickel 50.0 48.0 48.7 48.4 97 80-115 1.4 10 <br /> Potassium 5000 4960 5020 4990 100 82-115 1.3 10 <br /> Selenium 200.0 190 194 192 96 84-115 2.2 10 <br /> Silver 5.0 4.53 4.54 4 53 91 62-115 0.3 10 <br /> Sodium 10000 9840 9910 9870 99 85-115 0.7 10 <br /> Thallium 200 193 197 195 97 68-110 2.2 10 <br /> Tin 400 373 377 375 94 80-122 1 .1 10 <br /> Titanium 200.0 191 195 193 97 85-115 2.4 10 <br /> Vanadium 50.0 48.5 49 4 48.9 98 85-115 1.8 10 <br /> zinc 50 46.4 46.8 46.6 93 82-115 0 8 10 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br />