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<br />Toxic SUBSTANCES 33 <br />Table 4.5. Summary of special sampling or handling requirements for water samplesa (modified from <br />and permission to use granted by American Public Health Association et al. 1985). <br />Determination Container <br />Acidity P, G(B) <br />Alkalinity P, G <br />Biological oxygen P, G <br />demand <br />Boron P <br />Bromide P, G <br />Carbon, organic, G <br />total <br />Carbon dioxide P, G <br />Chemical oxygen P, G <br />demand <br />Chlorine, residual P, G <br />Chlorine dioxide P, G <br />Chlorophyll P, G <br />Color P, G <br />Conductivity P, G <br />Cyanide <br />Total P, G <br />Amenable to P,G <br />chlorination <br />Fluoride P <br />Grease and oil G, <br /> widemouthed <br /> calibrated <br />Hardness P, G <br />Iodine P, G <br />Metals, general P(A), G(A) <br />Chromium VI P(A), G(A) <br />Copper by <br />colorimetryb <br />Mercury P(A), G(A) <br />Nitrogen <br />Ammonia P, G <br />Nitrate P, G <br />Nitrate + P, G <br />nitrite <br />Miniminn <br />sample <br />size <br />(mL) <br />100 <br />200 <br />1,000 <br />100 <br />100 <br />100 <br />100 <br />500 <br />500 <br />500 <br />500 <br />500 <br />500 <br />500 <br />300 <br />1,000 <br />100 <br />500 <br />300 <br />Preservation <br />Refrigerate <br />Refrigerate <br />Refrigerate <br />None required <br />None required <br />Analyze immediately; or <br />refrigerate and add <br />H2SO4to pH <2 <br />Analyze immediately <br />Analyze as soon as possible, <br />or add H2SO4 to pH <2 <br />Analyze immediately <br />Analyze immediately <br />30 days in dark; freeze <br />Refrigerate <br />Refrigerate <br />Add NaOH to pH>12, <br />refrigerate in dark <br />Add 100 mg Na2S2O3/L <br />None required <br />Add H2SO4 to pH <2, <br />refrigerate <br />Add HNO3 to pH <2 <br />Analyze immediately <br />For dissolved metals, filter <br />immediately, add HNO3 to <br />pH <2 <br />Refrigerate <br />500 Add HNO3 to pH <2, 4° C <br />500 Analyze as soon as possible <br />or add H2SO4 to pH <2, <br />refrigerate <br />100 Add H2SO4 to pH <2, <br />refrigerate <br />200 Analyze as soon as possible <br />or refrigerate; or freeze <br />at -20° C <br />Maximum storage <br />(d = days, h = hours, <br />m = months) <br />Recommended Regulatoryb <br />24h 14d <br />24h 14d <br />6h 48h <br />28d 28d <br />28 d 28 d <br />7d 28d <br />7d <br />0.5 h <br />0.5 h <br />30 d <br />48 h <br />28 d <br />24 h <br />28 d <br />2h <br />2h <br />48 h <br />28 d <br />14d <br />28 d <br />28 d <br />6m <br />0.5 h <br />6m <br />24 h <br />28 d <br />7d <br />48 h <br />0 <br />28 d <br />28 d <br />6m <br />6m <br />48 h <br />28 d <br />28 d <br />48 h <br />28 d <br />I