Alkalinity |
Ice |
14 days |
Ammonia, Ammonia Nitrogen |
Ice, sulfuric acid (H2SO4) to pH≈<2 |
28 days |
Arsenic |
Ice, nitric acid (HNO3) to pH ≈2 |
6 months |
BOD (biochemical oxygen demand) |
Ice |
48 hours |
Boron |
Ice |
28 days |
Bromide |
None required |
28 days |
Calcium |
Ice, nitric acid (HNO3) to pH≈2 |
6 months |
Chloride |
None required |
28 days |
Chlorine, Total Residual |
None required |
Analysis immediately |
Chromium, Hexavalent (VI) |
Ice |
24 hours |
COD (chemical oxygen demand) |
Ice, sulfuric acid (H2SO4) to pH≈2 |
28 days |
Coliform, fecal |
Ice, 0.008% sodium thiosulfate (Na2S2O3 ● 5HOH) if residual chlorine is present |
6 hours |
Colour |
Ice |
48 hours |
Cyanide, Total |
Ice, sodium hydroxide (NaOH) to pH >12 |
14 days BUT maximum holding time is 24 hours if sulfide is present |
DO (dissolved oxygen) |
None |
Analyze immediately |
Fluoride |
Ice |
28 days |
Hardness |
Ice, nitric acid (HNO3) to pH ≈2 |
6 months |
Hydrocarbons, Aromatic Volatile Organic |
Ice, hydrochloric acid (HCI) to pH <2 |
14 days |
Mercury |
Ice, nitric acid (HNO3) to pH≈2 |
28 days |
Metals, except those specifically listed |
Ice, nitric acid (HNO3) to pH ≈2 |
6 months |
Nitrate |
Ice |
48 hours |
Nitrate-Nitrite |
Ice, sulfuric acid (H2SO4) to pH≈2 |
28 days |
Nitrite |
Ice |
48 hours |
Nitrogen, organic |
Ice, sulfuric acid (H2SO4) to pH≈2 |
28 days |
Nitrogen, total kjeldahl |
Ice, sulfuric acid (H2SO4) to pH≈2 |
28 days |
Oil & Grease |
Ice, hydrochloric acid (HCI) to pH <2 |
28 days |
Organics, Other |
Ice, 0.008% sodium thiosulfate (Na2S2O3 ● 5HOH) |
7 days until extraction; 40 days following extraction |
Orthophosphate |
Filter immediately, ice |
48 hours |
Pesticides |
Ice immediately |
7 days until extraction; 40 days following extraction |
Petroleum hydrocarbons, total recoverable |
Ice, hydrochloric acid (HCI) to pH≈2 |
28 days |
pH |
None required |
Analyze immediately |
Phenols |
Ice, sulfuric acid (H2SO4) to pH≈2 |
24 hours |
Phosphorus, total |
Ice, sulfuric acid (H2SO4) to pH≈2 |
48 hours |
Sodium |
Ice, nitric acid (HNO3) to pH≈2 |
6 months |
Specific Conductance |
None required |
Analyze immediately |
Sulfate |
Ice |
28 days |
Sulfide |
Ice, zinc acetate plus sodium hydroxide (NaOII) to pII>9 |
7 days |
Sulfite |
Ice |
Analyze immediately |
Temperature |
None required |
Analyze immediately |
Total Dissolved Solids |
Ice |
7 days |
Total Settleable Solids |
Ice |
48 hours |
Total Suspended Solids |
Ice |
7 days |
Turbidity |
None required |
Analyze immediately |
Volatile Organic Aromatics (VOA) |
None required |
|
Volatile Organic, Halogenated |
Ice, 0.008% sodium thiosulfate (Na2S2O3 ● 5HOH) |
14 days |
Volatile Organic, Non- halogenated |
Ice, 0.008% sodium thiosulfate (Na2S2O3 ● 5HOH) |
|