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STANDARD METHODS
Description Range Method
Hardness, Total LR 0 to 250 mg/L EPA 130.1
Hardness, Total MR 200 to 500 mg/L EPA 130.1
Hardness, Total HR 400 to 750 mg/L EPA 130.1
Hydrazine 0 to 400 µg/L p‑Dimethylaminobenzaldehyde
Iodine 0.0 to 12.5 mg/L DPD
Iron LR 0.000 to 1.600 mg/L TPTZ
Iron HR 0.00 to 5.00 mg/L Phenanthroline
Magnesium 0 to 150 mg/L Calmagite
Manganesse LR 0 to 300 µg/L PAN
Manganesse HR 0.0 to 20.0 mg/L Periodate
Molybdenum 0.0 to 40.0 mg/L Mercaptoacetic Acid
Nickel LR 0.000 to 1.000 mg/L PAN
Nickel HR 0.00 to 7.00 g/L Colorimetric
Nitrate 0.0 to 30.0 mg/L Cadmium reduction
Nitrite, Marine ULR 0 to 200 µg/L Diazotization
Nitrite LR 0 to 600 µg/L Diazotization
Nitrite HR 0 to 150 mg/L Ferrous Sulfate
Oxygen, Dissolved 0.0 to 10.0 mg/L Winkler
Oxygen Scavengers (Carbohydrazide) 0.00‑1.50mg/L Iron Reduction
Oxygen Scavengers (DEHA) 0 to 1000 µg/L Iron Reduction
Oxygen Scavengers (Hydroquinone) 0.00‑2.50mg/L Iron Reduction
Oxygen Scavengers (Iso‑Ascorbic Acid) 0.00‑4.50mg/L Iron Reduction
Ozone 0.00 to 2.00 mg/L DPD
pH 6.5 to 8.5 pH Phenol Red
Phosphate, Marine ULR 0 to 200 µg/L Ascorbic Acid
Phosphate LR 0.00 to 2.50 mg/L Ascorbic Acid
Phosphate HR 0.0 to 30.0 mg/L Amino Acid
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