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r 34 JOSEPH B. HUNN AND ROSALIE A. SCHNICK Table 4.5. Continued. etermination ontainer Minimum sample size (mL) reservation Maximum storage (d = days, h = hours, m = months) Recommended Regulatoryb Nitrite P, G 100 Analyze as soon as possible 0 48 h or refrigerate; or freeze at -20° C Organic, P, G 500 Refrigerate; add H2SO4 to 7 d 28 d Kjeldahl pH <2 Odor G 500 Analyze as soon as possible; 6 h - refrigerate Organic compounds Pesticides G(S), - Refrigerate; add 100 mg 7 d 7 d TFE-lined cap Na2S2O3/L if residual chlorine present Phenols P, G 500 Refrigerate, add H2SO4 to a 28 d pH <2 Purgeables by G, 50 Refrigerate; add 100 mg 7 d 14 d purge and TFE-lined cap Na2S2O3/L if residual trap chlorine present Oxygen, dissolved G, BOD bottle 300 Electrode Analyze immediately 0.5 h 1 h Winkler Titration may be delayed 8 h 8 h after acidification Ozone G 1,000 Analyze immediately 0.5 h - pH P, G - Analyze immediately 2 h 2 h Phosphate G(A) 100 For dissolved phosphate, 48 h 48 h filter immediately; refrig- erate; freeze at - 10° C Salinity G, wax seal 240 Analyze immediately or use 6 m - wax seal Silica P - Refrigerate, do not freeze 28 d 28 d Sludge digester G, gas bottle - - - gas Solids P, G - Refrigerate 7 d 7-14 d Sulfate P, G - Refrigerate 28 d 28 d Sulfide P, G 100 Refrigerate; add 4 drops 2N 28 d 28 d zinc acetate/100 mL Taste G 500 Analyze as soon as possible; 24 h - refrigerate Temperature P, G - Analyze immediately - - Turbidity P, G - Analyze same day; store in 24 h 48 h dark up to 24 hours a See text for details. For determinations not listed, use glass or plastic containers; preferably refrigerate during storage and analyze as soon as possible. Refrigerate = storage at 4° C, in the dark. P = plastic (polyethylene or equivalent); G = glass; G(A) or P(A) = rinsed with 1 + 1 HN03; G(B) = glass, borosilicate; G(S) = glass, rinsed with organic solvents; TFE = Teflon. bU.S. Environmental Protection Agency, Proposed Rules, Federal Register 44; No. 244, 18 December 1979.