By P. R. Sreemahadevan Pillai
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Extra info for A Comprehensive Laboratory Manual for Environmental Science and Engineering
38 A Comprehensive Laboratory Manual for Environmental Science and Engineering Experiment No. ___________________ Date ___________________ DETERMINATION OF IRON AND MANGANESE A. DETERMINATION OF IRON Aim To determine the quantity of iron present in the given sample of water. 3 ppm. It may be in true solution in colloidal state that may be peptized by organic matter, in the inorganic and organic iron complexes, or in relatively coarse suspended particles. It may be either ferrous or ferric, suspended or filterable.
Principle pH value of water indicates the hydrogen ion concentration in water and concept of pH was put forward by Sorenson (1909). pH is expressed as the logarithm of the reciprocal of the hydrogen ion concentration in moles/ litre at a given temperature. The pH scale extends from 0 (very acidic) to 14 (very alkaline) with 7 corresponding to exact neutrality at 25°C. pH is used in the calculation of carbonate, bicarbonate and CO2, corrosion and stability index etc. While the alkalinity or acidity measures the total resistance to the pH change or buffering capacity, the pH gives the hydrogen ion activity.
Make up the contents of each flask exactly to 100mL by adding distilled water and left stand for 10 minutes. 6. Take 50 mL distilled water in another conical flask. 7. Repeat steps 2 to 5 described above. 8. Measure the absorbance of each solution in a spectrophotometer at 508 nm against the reference blank prepared by treating distilled water as described in steps 6 and 7. Prepare a calibration graph taking meter reading on y-axis and concentration of iron on x-axis. 9. For visual comparison, pour the solution in 100 mL tall form Nessler tubes and keep them in a stand.
A Comprehensive Laboratory Manual for Environmental Science and Engineering by P. R. Sreemahadevan Pillai