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TABLE 5 <br /> PRECISION <br /> Average Relative Standard Deviation for Each Instrument <br /> Analyte at 5 to 10 Times the MDL <br /> TN TN Lead X-MET 920 X-MET 920 XL MAP <br /> 9000 Analyzer (SiLi (Gas-Filled Spectrum Spectrum <br /> Detector) Detector) Analyzer Analyzer <br /> Antimony 6.54 NR NR NR NR NR <br /> Arsenic 5.33 4.11 3.23 1.91 12.47 6.68 <br /> Barium 4.02 NR 3.31 5.91 NR NR <br /> Cadmium 29.84a NR 24.80a NR NR NR <br /> Calcium 2.16 NR NR NR NR NR <br /> Chromium 22.25 25.78 22.72 3.91 30.25 NR <br /> Cobalt 33.90 NR NR NR NR NR <br /> Copper 7.03 9.11 8.49 9.12 12.77 14.86 <br /> Iron 1.78 1.67 1.55 NR 2.30 NR <br /> Lead 6.45 5.93 5.05 7.56 6.97 12.16 <br /> Manganese 27.04 24.75 NR NR NR NR <br /> Molybdenum 6.95 NR NR NR 12.60 NR <br /> Nickel 30.85a NR 24.928 20.92a NA NR <br /> Potassium 3.90 NR NR NR NR NR <br /> Rubidium 13.06 NR NR NR 32.69a NR <br /> Strontium 4.28 NR NR NR 8.86 NR <br /> Tin 24.32a NR NR NR NR NR <br /> Titanium 4.87 NR NR NR NR NR <br /> Zinc 7.27 7.48 4.26 2.28 10.95 0.83 <br /> Zirconium 3.58 NR NR NR 6.49 NR <br /> Source: Reference 4 <br /> a These values are biased high because the concentration of these analytes in the soil <br /> samples was near the detection limit for that particular FPXRF instrument. <br /> NR Not reported. <br /> NA Not applicable; analyte was reported but was below the method detection limit. <br /> CD-ROM 6200 - 26 Revision 0 <br /> January 1998 <br />