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Simple and easy to determine oil and grease

 Analysis of Extractable organic ( Oil & Grease) in Hazardous Waste

    

                                                       


              

  Oil and grease is an important parameter which is analysed both water, waste water and industrial solid waste. if you want to know the analysis of Oil and Grease in the waste water click here Oil and Grease

In oil and grease analysis Hexane is being used to separate the oil and Grease form the sample.

Hexane has boiling point 40- 60 degree Celsius so when we do analysis of Oil and Grease we set the temperature slightly above the boiling point of Hexane.


Dear Friends if you want to more about the analysis of oil and grease please let me know in comments.

Estimation of Oil& grease in water and waste water

 Apparatus  and Material: Analytical balance, Vacuum pump ,Extraction thimble: Filter paper,Glass wool or small glass beads to fill thimble,Beaker,pH Indicator to determine acidity,Porcelain mortar, Extraction flask, Waterbath,Desiccator.pipette,conical flask,

Reagents: HCL,sodium sulfate, n-Hexane

Analysis Procedure:   Weigh out 20 + 0.5 g of wet sludge with a known Dry-weight fraction Place in a 150-mL beaker.

 

Acidify to a pH of 2 with approximately 0.3 mLconcentrated HCl.,Add 25 g prepared Mg2SO4 C H 2 O and stir to a smooth paste.

 

Spread paste on sides of beaker to facilitate evaporation. Let stand about 15-30 min or until substance is solidified. Move solids and grind to fine powder in a mortar.

Add the powder to the paper extraction thimble, Wipe beaker and mortar with pieces of filter paper moistened with solvent and add to thimble.

Fill thimble with glass wool (or glass beads).

Mix sample thoroughly, especially composited samples.

Blend 10 g of the solid sample of known dry weight fraction with 10 g of anhydrous sodium sulfate, and place in an extraction thimble. The extraction thimble must drain freely for the duration of the extraction period at a rate of 20 cycles/hr for 4 hr.

Using grease-free cotton, filter the extract into a pre weighed boiling flask. Use gloves to avoid adding fingerprints to the flask.    

Rinse flask and cotton with solvent, Connect the boiling flask to the distilling head and evaporate the solvent by immersing the lower half of the flask in water at 70EC. Collect the solvent for reuse. A solvent blank should accompany each analytical batch of samples.

 When the temperature in the distilling head reaches 50 C

Or the flask appears dry, remove the distilling head. To remove solvent vapor, sweep out the flask for 15 sec with air by inserting a glass tube that is connected to a vacuum source. Immediately remove the flask from

the heat source and wipe the outside to remove excess moisture and fingerprints.

Cool the boiling flask in a desiccators for 30 min and weigh.

Calculate oil and grease as a percentage of the total dry Solids

  

Calculation:   

 Extractable Organics   %      = (W2-W1)X100/Weight  of sample

want to know how to determine BOD in waste water click on the below given link.

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