By P. R. Sreemahadevan Pillai
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Additional info for A Comprehensive Laboratory Manual for Environmental Science and Engineering
3, colour of solution becomes pink. Titrate against standard sulphuric acid in the burette, till the colour just disappears. Note down the volume (V1). 5. Then add two drops of methyl orange indicator, the colour turns yellow. 6. Again titrate against acid, until the colour turns to orange yellow. Note down the total volume (V2). 02 N H2SO4 × sample (Methyl orange/phenolphthalein indicator) Description of sample Trial no. Burette reading (phenolphthalein indicator) Initial Volume of acid used V1 Burette reading (methyl orange indicator) Final Initial Volume of acid used V2 Final Calculation 1.
Bottle etc. 28 A Comprehensive Laboratory Manual for Environmental Science and Engineering Reagents 1. 01 M) 2. Eriochrome black T indicator 3. Ammonia buffer solution Procedure 1. Dilute 25 mL of sample (V) to about 50 mL with distilled water in an Erlenmeyer flask. 2. Add 1 mL of buffer solution. 3. Add two drops of indicator solution. The solution turns wine red in colour. 4. Add the standard EDTA titrant slowly with continuous stirring until the last reddish tinge disappears from the solution.
18. The matching colour standard will give the concentration of iron in the sample (µg Fe). Determination of Iron and Manganese 41 Observation Standard iron solution in mL Sample no. ….. mg/L Results Sample no. or description Discussion Iron content in mg/L (Fe) 42 A Comprehensive Laboratory Manual for Environmental Science and Engineering B. DETERMINATION OF MANGANESE Aim To determine the quantity of manganese present in the given sample. Principle Manganese exists in the soil principally as manganese dioxide, which is very insoluble in water containing carbon dioxide.
A Comprehensive Laboratory Manual for Environmental Science and Engineering by P. R. Sreemahadevan Pillai