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i i • <br /> Table 3 <br /> ANALYTICAL 1 FIELD MEASUREMENT METHODS <br /> Hold time, <br /> Sample Sample approx price <br /> Analyte Method Technique Container Preservation misc <br /> Oxygen Field reading Downhole meter Provide consistent storing <br /> Nitrate Field reading Downhole meter <br /> Nitrate EPA 300 or 352 1 lab 250 mL plastic or glass 4°C 48 hour hold,$15 <br /> Nitrite EPA 300 or 354 1 lab 250 mL plastic or glass 4°C 48 hour hold,$25 <br /> Nitratelnitrate EPA 353 1 Colonmetnc 500mL plastic 4°C,H2SO4 14 day hold,$20 <br /> Iron,total EPA 200 7 or SW 6010 ICP 100ml,plastic 4°C,HNO3 unfiltered <br /> Iron,dissolved EPA 200 7 or SW 6010 ICP 100mL plastic 4°C,HNO3 0 45 micron filter in field <br /> Sulfate EPA 300 or 375 4 lab 250 mL plastic or glass 4°C 28 day hold,$20 <br /> Sulfide SW 9030 or EPA 376 1 Titrimetric 250mL glass or plastic 4°C,Zn acetate+NaOH 7 day hold,$25 <br /> Redox Field reading Downhole meter Minimize atm exposure <br /> pH Field reading Downhole meter <br /> Temperature Field reading Downhole meter <br /> Conductivity Field reading Downhole meter <br /> Total heterotrophs Plate Count Proprietary $45 <br /> Total H'c'n using bacteria Plate Count Proprietary $60 <br /> Chloride/Sulfate/Nitrate EPA 300 0 1C 500m1,plastic NA 28 day hold <br /> Hydrogen Sulfide Gas meter Purged soil gas sample <br /> Carbon Dioxide Gas meter Purged soil gas sample <br /> Methane Gas meter Purged soil gas sample <br /> Total Organic Content EPA 415 1 Oxidation/NDIR 500mL plastic 4°C,H2SO4 28 day hold,$30 <br /> Alkalinity EPA 310 1 Colorimetne 100mL plastic or glass 4°C 14 day hold,$16 <br /> Hardness,total CaCO3 EPA 130 2 lab 250mL glass or plastic 4°C,H2SO4 or HNO3 6 month hold,$20 <br /> Ammonium EPA 350 3 lab 500ml,plastic 4°C,H2SO4 <br /> Phosphorous EPA 365 1 lab 100m1 plastic 4°C,H2SO4 28 day hold <br />