ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: daliu on May 03, 2011, 08:13:45 pm

Title: daliu's Question Thread
Post by: daliu on May 03, 2011, 08:13:45 pm

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  :)

Title: Re: daliu's Question Thread
Post by: Asx4Life on May 03, 2011, 11:02:23 pm

Errors would be from the incorrect preparation of the standards.

Title: Re: daliu's Question Thread
Post by: jackson1234 on May 04, 2011, 01:40:26 pm

Wrong wavelength was selected, which did not allow maximum absorbance of the substances within the sample.  [ UV Vis ]