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Enseco A CORNING Company DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: PB-FAA-AT Matrix: AQUEOUS QC Lot: 04 FEB 91-X Concentration Units: mg/L Lead 0.020 0.0218 0.0228 0.0223 112 82-115 4.5 11 Category: ICP-AT Matrix: AQUEOUS QC Lot: 13 FEB 91-Y Concentration Units: mg/L Aluminum 2.00 1.96 1 .97 1.97 98 85-115 0.6 10 Antimony 0.50 0.431 0.436 0.434 87 85-115 1 .3 10 Arsenic 0.5 0.506 0.507 0.507 101 85-115 0. 1 10 Barium 2.0 2.05 2.07 2.06 103 85-115 0.9 10 Beryllium 0.050 0.0518 0.0528 0.0523 105 80-115 1 .9 10 Boron 1 .0 1 .06 1 .08 1 .07 107 85-115 1 .2 10 Cadmium 0.050 0.0499 0.0537 0.0518 104 81-118 7.4 10 Calcium 100 105 108 106 106 85-115 2.5 10 Chromium 0.20 0.190 0.197 0. 193 97 85-115 3.3 10 Cobalt 0.50 0.494 0.507 0.501 100 85-115 2.6 10 Copper 0.25 0.253 0.255 0.254 102 85-115 0.9 10 Iron 1 .0 0.990 1 .01 1 .00 100 85-115 2.1 10 Lead 0.50 0.508 0.527 0.518 104 85-115 3.7 10 Lithium 0.20 0.207 0.207 0.207 103 85-115 0.2 10 Magnesium 50 52.8 53. 1 52.9 106 85-115 0.7 10 Manganese 0.50 0.489 0.500 0.494 99 85-115 2.3 10 Molybdenum 0.20 0.198 0.207 0.203 101 85-115 4.3 10 Nickel 0.50 0.503 0.508 0.505 101 83-115 1 . 1 10 Potassium 50 51 .2 51 .5 51 .3 103 83-115 0.7 10 Selenium 2.0 2.06 2.12 2.09 104 85-115 3.0 10 Silver 0.050 0.0488 0.0504 0.0496 99 56-116 3.3 35 Sodium 100 105 105 105 105 85-115 0.5 10 Thallium 2.0 2. 10 2. 11 2. 10 105 84-118 0.5 10 Tin 4.0 3.67 3.70 3.69 92 80-115 0.7 15 Titanium 0.20 0.210 0.214 0.212 106 85-115 1 .8 10 Vanadium 0.50 0.504 0.515 0.509 102 82-115 2.2 20 Zinc 0.50 0.506 0.519 0.513 103 80-115 2.6 20 Calculations are performed before rounding to avoid round-off errors in calculated results.