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Enseco <br /> A CORNING COmOdny <br /> DUPLICATE CONTROL SAMPLE REPORT <br /> Wet Chemistry Analysis and Preparation <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average(%) (RPD) <br /> DCS1 DCS2 AVG DCS Limits DCS Limit <br /> Category: IC-A <br /> Matrix: AQUEOUS <br /> QC Lot: 28 JUN 90-A <br /> Concentration Units: mg/L <br /> Fluoride 2.0 2.31 2.27 2.29 115# 84-105 1 .5 8 <br /> Chloride 3.0 2.90 2.74 2.82 94 83-116 5.7 19 <br /> Nitrite as N 2.0 NA NA NC NC 85-115 NC 15 <br /> Bromide 2.0 2.08 2.01 2.04 102 85-115 3.4 10 <br /> Nitrate as N 2.0 2. 10 2.07 2.08 104 85-115 1 .4 12 <br /> Sulfate 8.0 8.94 8.37 8.66 108 85-115 6.6 12 <br /> Orthophosphate as P 10.0 11 . 1 10.9 11 .0 110 85-115 1 .8 13 <br /> # = Recovery outside QC Limits <br /> ND = Not detected. <br /> NC = Not calculated, calculation not applicable. <br /> NA = Not applicable. <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br />