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Table -1 <br /> Sample Volume, Container Type, <br /> and Preservation Requirements <br /> Volume Required Container <br /> Parameters (ml) Type Preservation <br /> Volatile Halocarbons 40 Glass with HCl to pH <2 <br /> Teflon®-lined septum Cool to 4°C <br /> Volatile Aromatics 40 Glass with HCI to pH <2 <br /> Teflon-lined septum Cool to 4°C <br /> Metalsl,2 500 Plastica HNO3 to pH <2 <br /> Cool to 4°C <br /> Alkalinity 100 Plastic Cool to 4°C <br /> Bromide 100 Plastic Cool to 4°C <br /> Chemical Oxygen 50 Plastic H2SO to pH <2 <br /> Demand Cool to 4°C <br /> Chloride 50 Plastic Cool to 4°C <br /> Hexavalent Chromium 500 Plastic Cool to 4°C <br /> Nitrogen Ammonia 50 Plastic H2SO to pH <2 <br /> Coo to 4°C <br /> pj9\939\9390111 c <br />