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TABLE 6 <br /> PRECISION AS AFFECTED BY SAMPLE PREPARATION <br /> Average Relative Standard Deviation for Each Preparation Method <br /> Analyte Intrusive- Intrusive- <br /> In Situ-Field Undried and Unground Dried and Ground <br /> Antimony 30.1 15.0 14.4 <br /> Arsenic 22.5 5.36 3.76 <br /> Barium 17.3 3.38 2.90 <br /> Cadmium' 41.2 30.8 28.3 <br /> Calcium 17.5 1.68 1.24 <br /> Chromium 17.6 28.5 21.9 <br /> Cobalt 28.4 31.1 28.4 <br /> Copper 26.4 10.2 7.90 <br /> Iron 10.3 1.67 1.57 <br /> Lead 25.1 8.55 6.03 <br /> Manganese 40.5 12.3 13.0 <br /> Mercury ND ND ND <br /> Molybdenum 21.6 20.1 19.2 <br /> Nickel' 29.8 20.4 18.2 <br /> Potassium 18.6 3.04 2.57 <br /> Rubidium 29.8 16.2 18.9 <br /> Selenium ND 20.2 19.5 <br /> Silver' 31.9 31.0 29.2 <br /> Strontium 15.2 3.38 3.98 <br /> Thallium 39.0 16.0 19.5 <br /> Thorium NR NR NR <br /> Tin ND 14.1 15.3 <br /> Titanium 13.3 4.15 3.74 <br /> Vanadium NR NR NR <br /> Zinc 26.6 13.3 11.1 <br /> Zirconium 20.2 5.63 5.18 <br /> Source: Reference 4 <br /> a These values may be biased high because the concentration of these analytes in the soil <br /> samples was near the detection limit. <br /> ND Not detected. <br /> NR Not reported. <br /> CD-ROM 6200 - 27 Revision 0 <br /> January 1998 <br />