Question

Limitations of polarimeter

Answer 1

Answer:

I measured the optical rotation and specific rotation of different concentrations of L-asparagine monohydrate in water. At lower concentrations (<1 g/100 ml) the error in the specific rotation increased significantly.

Also, I calculated the specific rotation expected from the optical rotation measured and compared my answers to the measured specific rotation. Some values were very different (i.e. 2 fold). Is there a specific reason for this?

I am also struggling to find any articles highlighting the limitations of polarimetry, if anyone has any thoughts or papers that could help.

hope it helps..❤

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thank u...❤

Answer 2

Explanation:

I measured the optical rotation and specific rotation of different concentrations of L-asparagine monohydrate in water. At lower concentrations (<1 g/100 ml) the error in the specific rotation increased significantly.

Also, I calculated the specific rotation expected from the optical rotation measured and compared my answers to the measured specific rotation. Some values were very different (i.e. 2 fold). Is there a specific reason for this?

I am also struggling to find any articles highlighting the limitations of polarimetry, if anyone has any thoughts or papers that could help.

I appreciate any feedback given.

Thanks,

Andrew

Optical Rotation

Polarimetry

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All Answers (2)

3rd Mar, 2016

Jose M Saiz

Universidad de Cantabria

Polarimetry is sometimes very tricky, in the sense that noiseis always present, and difficult to characterise, either in a conventional polarimeter, an ellipsometer or a full polarimeter.

I haven't handled that particular substance that you mention, but I would pay attention to: temperature control, purity of distilled water, apparatus callibration and -most importantly- contaminationn and alteration of the sample either in origin or in the manipulation process.

I would suggest to contrast your results with others from another instrument. I hope that this feedback, though quite poor, might suggest you some course of action.

4th Apr, 2016

Andrew Steven Dunn

University of Strathclyde

Thank you for your feedback! I'll take those points into consideration and do some further testing.

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Related Publications

Optical Activity at Interfaces

Conference Paper

Oct 2009

Peer Fischer

Polarimetry requires long path-lengths. Here we consider chiro-optical phenomena that arise at an interface and therefore allow the analysis of microfluidic volumes. New effects due to the addition of a magnetic field are also described