Question

Why is it important not to leave fingerprints or scratch the sample cells in spectrophotometric measurements? Select one: Scratches or fingerprints are not likely to have an effect on spectrophotometric measurements. Scratches and fingerprints on the surface of the cell can decrease the amount of light that reaches the detector. Scratches and fingerprints make it difficult for the cell to be positioned properly in the spectrophotometer. Scratches and fingerprints on the surface of the cell can contaminate the sample.

Answer 1

Answer:

Scratches and fingerprints on the surface of the cell can decrease the amount of light that reaches the detector.  If this happens your results will not be accurate.

Explanation:

This instrument depends on a careful usage to measure accurately the concentration in an specific solution. The wavelength can be inaccurate if some procedures were not done during the preparation process.  

When cleaning the cuvette or manipulating it, always use a lint free cloth and make sure that you removed any drops of water that might have fallen into the cuvette.