Download e-book for kindle: A Comprehensive Laboratory Manual for Environmental Science by P. R. Sreemahadevan Pillai

By P. R. Sreemahadevan Pillai

ISBN-10: 8122426913

ISBN-13: 9788122426915

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Additional resources for A Comprehensive Laboratory Manual for Environmental Science and Engineering

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So colorimetric methods are applicable. The methods are (1) persulphate method, and (2) periodate method. Both methods depend upon oxidation of manganese from its lower oxidation state to VII where it forms the highly coloured permanganate ion. The colour produced is directly proportional to the concentration of manganese present over a considerable range of concentration in accordance with Beer’s law. So it can be measured by eye or photometric means. Provisions must be made to overcome the influence of chlorides.

4. Stir at constant speed exactly for one minute. 5. After stirring pour some of the solution into the absorption cell of the photometer, and measure the turbidity at 30 second intervals for four minutes. 6. Usually maximum turbidity occurs within two minutes and the reading remains constant thereafter for 3 to 10 minutes. So, take reading with maximum turbidity occurring in within four minutes. 7. Prepare a calibration curve. The standards are prepared at 5 mg/L increments in the 0–40 mg/L sulphate range and their turbidity or absorbance read.

Pipette 4. 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.

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A Comprehensive Laboratory Manual for Environmental Science and Engineering by P. R. Sreemahadevan Pillai


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