Sampling Air

Determination Container Sample size (mL) Preservation Maximum storage
Acidity P, G(B) 100 Refrigerate 24 h
Alkalinity P, G 200 Refrigerate 24 h
BOD P, G 1000 Refrigerate 6 h
Boron P 1000 HNO3 to pH < 2 28 d
Bromide P, G 100 None required 28 d
Carbon, organic, total G (B) 100 Analyzed immediately; or refrigerate and add HCl, H3PO4 or H2SO4 to pH<2 7 d
Carbon dioxide P, G 100 Analyzed immediately 0.25 h
COD P, G 100 Analyze as soon as possible, or add H2SO4 to pH < 2; refrigerate 7 d
Chloride P, G 50 None required N.S.
Chlorine, total, residual P, G 500 Analyze immediately 0.25 h
Chlorine dioxide P, G 500 Analyze immediately 0.25 h
Chlorophyll P, G 500 Dark, 4oC 24 – 48 h
Color P, G 500 Refrigerate 48 h
Conductance P, G 500 Refrigerate 28 d
Cyanide P, G 1000 Add NaOH to pH>12, refrigerate in dark
Fluoride P 100 None required 28 d
Hardness P, G 400 Add HNO3 or H2SO4 to pH < 2 6 months
Iodine P, G 500 Analyze immediately 0.25 h
Metals, general P(A), G(A) 1000 Filter immediately, add HNO3 to pH < 2 6 months
Chromium VI P(A), G(A) 1000 Refrigerate 24 h
Mercury P(A), G(A) 1000 Add HNO3 or H2SO4 to pH < 2 28 d
Ammonia P, G 500 Analyze as soon as possible, or add H2SO4 to pH < 2; refrigerate 7 d
Nitrate P, G 100 Analyze as soon as possible, refrigerate 48 h
Nitrate + nitrite P, G 200 Add H2SO4 to pH < 2; refrigerate 1-2 d
Nitrite P, G 100 Analyze as soon as possible, refrigerate none
Organic, Kjeldahl-N P, G 500 Refrigerate, add H2SO4 to pH < 2 7 d
Odor G 500 Analyze as soon as possible, refrigerate 6 h
Oil and grease G 1000 Add H2SO4 to pH<2, refrigerate 28 d
MBAS P, G 250 Refrigerate 48 h
Pesticides* G(S) 1000 Refrigerate, add 1000 mg ascorbic acid/L if residual chlorine present 7 d
Phenols P, G 500 Refrigerate, add H2SO4 to pH < 2 *
Base/neutral&acids G(S) 1000 Refrigerate 7 d
Dissolved Oxygen G, BOD 300 Analyzed immediately 0.25 h
Ozone G 1000 Analyzed immediately 0.25 h
pH P, G 50 Analyzed immediately 0.25 h
Phosphate G(A) 100 Refrigerate 48 h
Phosphorus total P, G 100 Add HCl or H2SO4 to pH<2, refrigerate 28 d
Salinity G 240 Use wax seal 6 month
Silica P 200 Refrigerate 28 d
Solids P, G 200 Refrigerate 7 d
Sulphate P, G 100 Refrigerate 28 d
Sulphide P, G 100 Refrigerate; add 4 drops 2 N zinc acetate/100 mL; add NaOH to pH>9 28 d
Temperature P, G Analyzed immediately 0.25 h
Turbidity P, G 100 Refrigerate in dark 24 h

* For determinations not listed, use glass or plastic containers; preferably refrigerate during storage and analyze as soon as possible

P = plastic (polyethylene or equivalent); G = glass; G(A) or P(A) = rinsed with 1 + 1 HNO3; G(B) = glass, borosilicate; G(S) = glass, rinsed with organic solvents or baked

Refrigerated = storage at 4 oC ± 2 oC; in the dark

N.S. = not stated in cited reference; stat = no storage allowed; analyze immediately

References
APHA, 1998. Standard methods for the examination of waters and wastewaters. APHAAWWA-WEF, Washington, DC.

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