Based on the different chromatographic techniques that you have learned, provide a method or describe a procedure how to analyse the following samples: 1. Analysis of dioxin in water by gas-chromatography 2. Analysis of parabens in cosmetic product by gas chromatography 3. Analysis of caffeine in beverage by HPLC 4. Analysis of PCB in water by HPLC

Based on the different chromatographic techniques that you have learned, provide a method or describe a procedure how to analyse the following samples: 1. Analysis of dioxin in water by gas-chromatography 2. Analysis of parabens in cosmetic product by gas chromatography 3. Analysis of caffeine in beverage by HPLC 4. Analysis of PCB in water by HPLC

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter14: Chromatography

Section: Chapter Questions

Problem 9P

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Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray contrast agent that aids with the radiologic imaging of the anatomy. One such contrast agent is sodium diatrizoate, a nonvolatile water-soluble compound. A 0.378-m solution is prepared by dissolving 38.4 g sodium diatrizoate (NaDTZ) in.l.60 102 mL water at 3 1.2C (the density of water at 31.2C is 0.995 g/cm3). What is the molar mass of sodium diatrizoate? What is the vapor pressure of this solution if the vapor pressure of pure water at 31.2C is 34.1 torr?
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how to use Gas Chromatography in Cosmetics Provide a procedure on how to do this example that you provided. Explain the procedure and what data would you gather?
1. Why is it necessary to cover the developing chamber tightly during the development of a chromatogram? 2. Can paper chromatography be used to separate and identify very volatile substances? Explain your answer.
PAPER CROMATOGRAPHY • Define chromatography • Demonstrate an understanding of the process of chromatography • Describe the steps involved in a chromatography investigation Explanation Coloured inks are often made up of several different inks. Each colour of ink will get carried a different distance by the water, allowing you to see all of the different inks. Try this with different colours to see what actually goes into a colour. This technique is called chromatography and can be used in chemistry to find out what is in an unknown mixture. II. Materials .Felt tip pens (non-washable) . Kitchen roll .A bowl or cup . Water • Scissors III. Health and safety • Make sure that you thoroughly clean any equipment after the experiment before using for food IV. Procedure Method 1 1. Take a sheet of kitchen roll and draw a simple picture with a non-washable felt tip pen. 2. Place the sheet over an empty bowl. This is to keep the paper from getting too wet. 3. Carefully add a few drops of water…
Can you use chromatography to purify a mixture? Why?
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4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.
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