Thursday, December 1, 2011

Preparation of chemicals for BOD

4 solution required to be added into the sample:

To make 1L solution:
  • Phosphate buffer solution
8.5g of potassium dihydrogen phosphate (KH2PO4)
33.4g of sodium hydrogen phosphate heptahydate (NA2HPO4.7H20)
1.7g of Ammonium chloride (NH4Cl)
21.75g of Dipotassium hydrogen phosphate (K2HPO4)
*add all up and top up with distilled water till the level

  • Magnesium sulphate
22.5g of MgSO4 + distilled water
  • Calcium chloride
27.5g of CaCl2 + distilled water
  • Ferric chloride
0.25g + distilled water

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