By P. R. Sreemahadevan Pillai
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Extra info for A Comprehensive Laboratory Manual for Environmental Science and Engineering
Which is the major form of alkalinity? How is it formed? What is excess alkalinity? How do you express it? 02 N H2SO4 for the titration? The water where algae are flourishing is alkaline. Why? Will there be diurnal variation in pH? Why does the pH change on aerating the water? For efficient coagulation the water must be alkaline. Why? Why do we use CO2 free distilled water for analysis? Determination of Alkalinity 25 26 A Comprehensive Laboratory Manual for Environmental Science and Engineering Experiment No.
Buffer solutions 2. pH paper Procedure (a) Using Universal Indicator 1. 10 mL of sample is taken in a cuvette. 3. Universal indicator 32 A Comprehensive Laboratory Manual for Environmental Science and Engineering 2. 2 mL of universal indicator is added and placed in the hole provided for. 3. A colour disc corresponding to this indicator is inserted into the comparator and the disc rotated such that the 2 circles indicate identical colours. 4. The reading is noted. 5. The procedure can be repeated using an indicator whose range is near the value obtained.
8. Dilute the contents in all the flasks to 100 mL with distilled water and mix. Pour the contents into 100 mL Nessler tubes. 9. Match the colour of the sample with that of the colour standards. Note down the concentration of Mn in µg. 10. If the spectrophotometer is used, one distilled water blank has to be prepared along with the colour standards. 11. Measure the absorbance of each solution in a 1cm cell at 525 nm against the reference blank prepared by treating distilled water. 12. Prepare the calibration graph taking meter reading along y-axis and concentration of manganese (in µg) in colour standards on x-axis.
A Comprehensive Laboratory Manual for Environmental Science and Engineering by P. R. Sreemahadevan Pillai
Categories: Environmental Science