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SATISH PRADHAN DNYANASADHANA COLLEGE- THANE-400604

SATISH PRADHAN DNYANASADHANA COLLEGE- THANE-400604. DEPARTMENT OF CHEMISTRY Introduction to Analytical Chemistry and Statistical Treatment of Analytical Data by Dr.G.R.Bhagure. Purpose of Chemical Analysis. Non Classical Methods. Monochromatic light. Photocell /PMT detector.

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SATISH PRADHAN DNYANASADHANA COLLEGE- THANE-400604

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  1. SATISH PRADHAN DNYANASADHANA COLLEGE- THANE-400604 DEPARTMENT OF CHEMISTRY Introduction to Analytical Chemistry and Statistical Treatment of Analytical Data by Dr.G.R.Bhagure

  2. Purpose of Chemical Analysis

  3. Non Classical Methods

  4. Monochromatic light Photocell /PMT detector 2. Instrument: Single Beam Colorimeter Read Out Device U.V.Light & visible light Filter or Monochromator • Absorption spectroscopy

  5. Atomic Absorption Spectrophotometer Rotating Chopper Hollow Cathode Lamp P.M.T.Detector Flame Amplifier Read Out Grating Power Supply Sample Solution Absorption spectroscopy

  6. Emission Spectroscopy. Flame Photometer Slit Collimating Mirror P.M.T.Detector Amplifier Read Out Fuel Oxidant Prism Monochromator Sample Solution

  7. Monochromatic light 2. Instrument: Single Beam Fuorimeter U.V.Light & visible light Primary filter Secondary filter Photocell /PMT detector Read Out Device

  8. Turbidimeter Photocell Detector Read Out Device Sample Cell visible light Filter Technique is used when concentration of suspended particles are high In this intensity of transmitted light is measured

  9. Nephelometer Graduated Disc Collimating Lens Light Trap visible light Photocell Detector Technique is used when concentration of suspended particles are less In this intensity of scattered light is measured Sample Cell Read Out Device

  10. 1.2 SAMPLING Terms involved, importance of sampling, sampling techniques, sampling of gases, ambient and stack sampling, equipments used, sampling of homogenous and heterogeneous liquids, sampling of static and flowing liquids, methods and equipments used, sampling of solids, importance of particle size, and sample size, samples used In order to understand the criteria for evaluating the utility of the analytical techniques, need for the reduction in sample size, methods of reduction in sample size, collection, preservation and dissolution of the sample.

  11. Sampling Unit:The minimum size package in the consignment which sample may represent is known as sampling unit. • Increment:A stated amount of the material that is withdrawn from the sampling unit is defined as Increment.

  12. 1 2 3

  13. Cleanliness of apparatus and containers

  14. Positive identification of samples

  15. Apparatus for sampling of Homogenous Liquids Heterogeneous liquids or immiscible liquids B A Sample Thief Liquid

  16. Device for Sampling of static and flowing liquid

  17. Heterogeneous liquids or immiscible liquids • 1) Two immiscible liquids separating into two layers : Liquid-2 Height of the layers Liquid-1 Height of the layers Sample thief is used to with draw the sample so that gross sample can be prepared.

  18. Heterogeneous liquids or immiscible liquids • 2) Emulsion or unstable suspension: • Two phases are separated by filtration , • Solid and liquid are separated • The two phases are weighed and then sampled separately. • If above is not feasible the entire suspension is stirred vigorously and resulting liquid is sampled. • Sample thief is used to with draw the sample so that gross sample can be prepared.

  19. Heterogeneous liquids or immiscible liquids • 3) sampling of liquids containing partially crystallized solids : • Semi solidified liquid or liquid containing crystallized solids are heated, • Heating is continued till solid dissolves or melts into liquid. • Then sample is withdrawn by sample thief.

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