Oceanography

Reagents

• Ammonium Molybdate solution: Dissolve 4.0 gm of analytical reagent quality ammonium para molybdate in about 300 ml distilled water, add 12 ml of concentrated HCl, mix and make up to 500 ml using distilled water.
• Metal-sulphite solution: Dissolve 6 gm of anhydrous sodium sulphite in 500 ml distilled water and then add 10 gm of metal.
• Oxalic acid solution: Dissolve 50gm of analytical reagent quality oxalic acid dihydrate in 500 ml distilled water.
• Sulphuric acid solution 50%: 250 ml concentrated H₂SO₄ dilute to 250 ml of distilled water.
• Reducing reagent: Mix 100 ml of metal sulphite solution with 60 ml of oxalic acid solution, add slowly 60 ml of 50% H₂SO₄ and make up to 300 ml with distilled water.