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Spectrophotometry measures light absorption: A = log(I₀/I) = εbc (Beer-Lambert law), used for quantitative analysis.

Trin-for-trin guide

  1. 1Input measured absorbance, path length, molar absorptivity
  2. 2Calculate concentration
  3. 3Generate calibration curve if multiple samples

Løste eksempler

Input
Absorbance 0.5, ε = 5000 M⁻¹cm⁻¹, b = 1 cm
Resultat
c = A/(εb) = 0.5/5000 = 1×10⁻⁴ M

Almindelige fejl at undgå

  • Using wrong wavelength for compound
  • Not accounting for baseline absorbance

Ofte stillede spørgsmål

What's molar absorptivity?

Characteristic of molecule at specific wavelength; tabulated values for known compounds.

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