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o-Tolidine, 0.1%
Turbidity Stock Solution I, Hydrazine Sulfate, 1%
Zobell's Solution (ORP Standard, 220 mV)
Zinc, Granular, 20 Mesh, ACS
Sodium Oxalate, 0.025M (0.05N), for Nitrogen (Nitrite)
Sodium Thiosulfate, 0.025N (0.025M)
Sodium Thiosulfate, 0.0375N (0.0375M)
Starch Indicator, 1%, Preserved with Chloroform (Mercury Free)
Sulfosalicylic Acid, 5% w/v
Sulfuric Acid, 0.01N (0.005M)
Sulfuric Acid, 37% v/v (37+63), for Phosphorus
Sulfuric Acid, 5.0N (2.5M)