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1'.Enseco <br /> A Coming Companv <br /> DUPLICATE CONTROL SAMPLE REPORT <br /> is Wet Chemistry Analysis and Preparation <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average(%) (RPD) <br /> DCS1 DCS2 AVG DCS Limits Limit <br /> Category: IC-A <br /> Matrix. AQUEOUS <br /> QC Lot: 10 OCT 91-B <br /> Concentration Units mg/L <br /> Fluoride 2 0 1 .96 1 .98 1 .97 99 87-112 1 .0 10 <br /> Chloride 3.0 3.09 3. 10 3.10 103 86-109 0.3 10 <br /> Nitrite (as N) 2.0 2.04 2.04 2.04 102 86-110 0.0 10 <br /> Bromide 2.0 2 15 2. 13 2. 14 107# 87-106 0.9 16 <br /> Nitrate (as N) 2.0 2. 11 2.08 2. 10 105 87-109 1 4 10 <br /> Sulfate 8 0 8.03 8. 11 8.07 101 88-106 1 0 10 <br /> Orthophosphate (as P) 10.0 10 1 9.99 10. 1 101 89-109 1 .5 10 <br /> Category- IC-A <br /> Matrix AQUEOUS <br /> QC Lot: 11 OCT 91-A <br /> Concentration Units mg/L <br /> Fluoride 2 0 2.04 2.02 2.03 102 87-112 1 .0 10 <br /> Chloride 3.0 3.09 3 12 3. 10 104 86-109 1 .0 10 <br /> Nitrite (as N) 2.0 2 10 1 96 2.03 102 86-110 6.9 10 <br /> Bromide 2.0 2.20 1.94 2 07 104 87-106 13 16 <br /> Nitrate (as N) 2.0 2. 10 2.06 2.08 104 87-109 1 9 10 <br /> Sulfate 8 0 8.04 8 00 8.02 100 88-106 0.5 10 <br /> Orthophosphate (as P) 10.0 9 92 10. 1 10 0 100 89-109 1 .6 10 <br /> # = Recovery outside QC Limits <br /> Calculations are performed before rounding to avoid round-off errors in calculated results <br />