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What are the advantages and disadvantages in using spectrophotometric measurements for the analysis of various compounds?

Explain Beer's and Lambert's laws and how are these important to spectrophotometric measurements?

How are spectrophotometric measurements used for the determinations of content of phenolic compounds in plants ? What could be possible problems involves in these (specific) procedures and what has been identified in the literature? What are some suggestions for the elimination of these problems?

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