Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Molar absorbtivity database?

  1. Apr 25, 2007 #1
    molar absorbtivity database??


    I'm just looking for the molar absorbtivity for potassium permanganate at 410nm wrt Beer Lambert Law, i cant find a database anywhere. Any help would be greatly appreciated

    Last edited: Apr 25, 2007
  2. jcsd
  3. Apr 25, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Molar absorptivity is usually tabulated for lambda(max). The spectrum of Potassium permanganate shows a minimum at 425 nm. You may not be able to find the absorption coefficent at 410 nm since it is not very useful in most cases. You will probably be required to do some measurements and calculate it for yourself. Keep in mind that this wavelength (410 nm) occurs on a steep edge of a strong absorption band and slight wavelength shifts on that band will cause a huge error in your measurement.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook