Conventional Inorganic Analyses

Category Methods Minimum Qty. Recommended Containers Required Preservation Holding Time
Aqueous Samples
Alkalinity 310.1-2 100 mL Plastic or Glass Bottle Cool to 4° C 14 Days
Bromide 300.0 100 mL Plastic or Glass Bottle None 28 Days
Chloride 300.0 50 mL Plastic or Glass Bottle None 28 Days
Chlorine, Total Residual 300.0 200 mL Plastic or Glass Bottle None Analyze Immediately
Cyanides 335.1-3 500 mL Plastic or Glass Bottle Remove Sulfied NaOH to pH >12, Cool to 4° C 14 Days
Fluoride 300.0 100 mL Plastic or Glass Bottle None 28 Days
Ammonia 350.1-3 400 mL Plastic or Glass Bottle Sulfuric Acid to pH <2 28 Days
Total Kjeldahl Nitrogen 351.1-4 500 mL Plastic or Glass Bottle Sulfuric Acid to pH <2, Cool to 4° C 28 Days
Nitrate 300.0 100 mL Plastic or Glass Bottle Cool to 4° C 48 Hours
Nitrite 300.0 50 mL Plastic or Glass Bottle Cool to 4° C 48 Hours
Orthophosphate 365.1-3 50 mL Glass Bottle Only Filter (0.45 um), Cool to 4° C 48 Hours
Oxygen, Dissolved 360.1 300 mL Glass Bottle Only None Analyze Immediately
Phosphorus, Total 365.1-4 50 mL Glass Bottle Only Sulfuric Acid to pH <2, Cool to 4° C 28 Days
Silica 370.1 50 mL Plastic Bottle Only Cool to 4° C 28 Days
Sulfate 300.0 50 mL Plastic or Glass Bottle Cool to 4° C 28 Days
Sulfide 376.1-2 500 mL Plastic or Glass Bottle, 2 mL Zinc Acetate, Cool to 4° C NaOH to pH >12 7 Days
Sulfite 377.1 50 mL Plastic or Glass Bottle None None Analyze Immediately

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