Figure 3. Top: Detection of the absorption of the proline-ninhydrine complex (different proline concentrations) at 420 nm. Bottom: Absorption vs. concentration

From

Short Communication: Electrochemiluminescence on the Basis of tris(bipyridyl)ruthenium(II) – Further Analytical Experiments

A. Habekost

World Journal of Chemical Education. 2016, 4(3), 64-66 doi:10.12691/wjce-4-3-3