Oceanography

3. Reagents

a. Manganese II chloride tetrahydrate

40 g of manganous chloride tetrahydrate is dissolved in 100ml distilled water. (or)

b. Manganese sulphate reagent

48 g of MnSo_4. 4H₂O or 40 g of MnSo_4. 2H₂O or 36.5 of MnSo_4.H₂O is dissolved in water and the volume is made up to 100 ml with distilled water.

c. Alkaline iodide

60 g of Kl and 30g of KOH are dissolved separately in a minimum amount of water. Both these solutions are mixed together and this solution is then made up to 100ml with distilled water.

d. Sulphuric acid

50ml of conc. H₂ So₄ is carefully added to 50ml of distilled water (This mixture should be cooled during mixing).

e. Sodium thiosulphate

2.482g of Na₂S₂O₃.5 H₂O is dissolved and made up to 1000ml with distilled water. The normality of this solution is 0.01N.

f. Starch solution

1 g of soluble starch is dispersed in 100ml of distilled water. The solution is quickly heated to boiling. One drop of phenol or formaldehyde is added to every 50ml of starch solution to check microbial degradation.