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November 01, 2025, 12:29:23 pm
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Author Topic: daliu's Question Thread  (Read 518 times)  Share 

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daliu

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daliu's Question Thread
« on: May 03, 2011, 08:13:45 pm »
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Hey all,

For UV-Visible spectroscopy (and on that line, Colorimetry and AAS as well) what factors would lead to a measured result lower than expected? For example, if the manufacturer specified the iron content in a cereal to be 2.6ppm but the actual determined content was 1.3ppm, what factors could possibly lead to this error?

(i.e. the absorbance determined was too low)

[lol sorry for the outlandish numbers, there's no way there'd only be 2.6ppm in cereal but this is just a rhetorical!]

Thanks in advance  :)
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2011 ATAR: 99.55 ~ English [46], Chemistry [48], Mathematical Methods (CAS) [45], Specialist Mathematics [37 scaled to 48.8], Revolutions [39], Chinese [28] (LOL hen bu hao).

Asx4Life

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Re: daliu's Question Thread
« Reply #1 on: May 03, 2011, 11:02:23 pm »
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Errors would be from the incorrect preparation of the standards.
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jackson1234

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Re: daliu's Question Thread
« Reply #2 on: May 04, 2011, 01:40:26 pm »
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Wrong wavelength was selected, which did not allow maximum absorbance of the substances within the sample.  [ UV Vis ]
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