Containers and Preservatives – Inorganics

Routine Water Tests Minimum Sample Container Holding Time Preservative
Alkalinity 100 Plastic 14 Days 4 C
pH 50 Plastic ASAP 4 C
Anions (Cl, S04, F) 100 Plastic 28 Days 4 C
Total Dissolved Solids 100 Plastic 7 Days 4 C
Total Suspended Solids 200 Plastic 7 Days 4 C
Turbidity 100 Plastic 1-2 Days 4 C
Nitrate (N03) 50 Plastic 28 Days 2ml 25% Sulphuric Acid
Ammonia Nitrogen (NH4) 20 Plastic 28 Days 2ml 25% Sulphuric Acid
Nitrate-Nitrite (N03-N02) 50 Plastic 28 Days 2ml 25% Sulphuric Acid
Total Kjeldahl Nitrogen (TKN) 100 Plastic 28 Days 2ml 25% Sulphuric Acid
Total Phosphorus (TP) 50 Plastic 28 Days 2ml 25% Sulphuric Acid
Biochemical Oxygen Demand (BOD) (5 day) 250 Plastic 24 Hours 4 C
Chemical Oxygen Demand (COD) 50 Plastic 28 Days 2ml 25% Sulphuric Acid
Total Organic Carbon (TOC) 100 Plastic 28 Days 2ml 25% Sulphuric Acid

Specialty Tests – Routine

Cyanide 50 Plastic 14 Days 6 mL NaOH
Phenols 50 Glass 28 Days 50% Sulphuric Acid
Colour 200 Plastic 7 Days 4 C
Hexavalent Chromium (Cr+6) 300 Plastic 24 Hours 4 C
Tannins & Lignins (T&L) 200 Plastic 7 Days 4 C
Odour 200 Plastic 7 Days 4 C

Metals Screens

Metals by ICP 50 Precleaned Plastic 90 Days 5 mL 20% Nitric Acid
Mercury (Cold Vapour) 30 Precleaned Plastic 28 Days Nitric/dichromate
Hydride (Se, As or Se) 50 Precleaned Plastic 90 Days 5 mL 20% Nitric Acid

Microbiological

Coliforms 200 Sterile Plastic 24 Hours Sterile (sodium thiosulphate if chlorinated)
Microtox 200 Precleaned glass 48-72 hours none
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