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A Enseco <br /> 'A Corning Companv <br /> ISDUPLICATE CONTROL SAMPLE REPORT <br /> Wet Chemistry Analysis and Preparation <br /> Concentration Accuracy Precision <br /> Analyte Spiked Measured Average(%) (RPD) <br /> DCS1 OCS2 AVG DCS Limits DCS 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 />