A simplified yet sensitiive system is described for the detection of the two-photon ionization signal in solution. The photo-ionization cell consists of a quartz cuvette and a pair of stainless steel electrodes. Several aromatic compounds, including quinones, can be detected in the ng l-1-mg l-1 range both in hexane and in methanol; detection limits of pyrene in hexane and in methanol are 0.02 μg l-1 and 4 μg l-1, respectively. The detectability in hexane is much better than that in methanol. The detection limits and the molar absorptivities at the excitation wavelength are shown to be correlated.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Environmental Chemistry