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6Â¥: Originally posted by sally208 at 2011-09-05 20:50:14
Check your instrumental parameters. This region looks like the position where the instrument changes the optical source.

Measure a background absorption or a common dye solution, to see whether y ...

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The reason is greatly possible that the concentration of your particles is too high, thus the absorbance exceeds the limit of the instrument.
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2Â¥: Originally posted by sally208 at 2011-09-05 16:51:40:
The reason is greatly possible that the concentration of your particles is too high, thus the absorbance exceeds the limit of the instrument.

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