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Table -1 <br /> Sample Volume, Container Type, <br /> and Preservation Requirements <br /> (Continued) <br /> Volume Required Container <br /> Parameters (ml) Type Preservation <br /> Hardness2 100 Plastic HNO3 to pH <2 <br /> Cool to 4°C <br /> Methylene Blue Activated 250 Plastic Cool to 4°C <br /> Substances <br /> Nitrate Nitrogen 100 Plastic 1­12SO to pH <2 <br /> Cool to 4°C <br /> Sulfate 50 Plastic Cool to 4°C <br /> Sulfide 500 Plastic 2 ml zinc acetate <br /> Cool to 4°C <br /> Total Dissolved Solids 100 Plastic Cool to 4°C <br /> Total Organic Carbon 25 Glass with I-12SO to pH <2 <br /> Teflon-lined septum Cool to 4°C <br /> Metals include aluminum, antimony, arsenic, barium, beryllium, boron, cadmium, calcium, chromium (total), cobalt, <br /> copper, iron, lead, magnesium, manganese, mercury, molybdenum, nickel, potassium, selenium, silver, sodium, <br /> thallium,tin,vanadium, and zinc. <br /> 3Ground-water samples are field filtered through a 0.45-micron acrylic copolymer filter before preservation. <br /> Plastic= linear polyethylene <br /> pj9\939\9390111 c <br />