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DUPLICATE CONTROL SAMPLE REPORT <br />Wet Chemistry Analysis and Preparation (cont.) <br />Analyte <br />Category: COD -A <br />Matrix: AQUEOUS <br />QC Lot: 13 JUL 89-A <br />Concentration Units: mg/L <br />Chemical Oxygen Demand High) <br />Chemical Oxygen Demand Low) <br />Category: NO3&NO2-A <br />Matrix: AQUEOUS <br />QC Lot: 12 JUL 89-A <br />Concentration Units: mg/L <br />Nitrate as N <br />Nitrite as N <br />Category: COD -A <br />Matrix: AQUEOUS <br />QC Lot: 13 JUL 89-B <br />Concentration Units: mg/L <br />Chemical Oxygen Demand High) <br />Chemical Oxygen Demand Low) <br />E11Secc <br />Concentration Accuracy Precision <br />Spiked Measured Avera ge(%) (RPD <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />500 507 507 507 101 85-115 0.0 10 <br />50 45.9 45.6 45.8 92 85-115 0.7 15 <br />0.25 0.238 0.259 0.248 99 75-125 8.5 20 <br />0.25 0.267 0.265 0.266 106 75-125 0.8 20 <br />500 507 505 506 101 85-115 0.4 <br />10 <br />50 48.5 48.2 48.3 97 85-115 0.6 15 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />El <br />1�i <br />