Abstract
Abstract A minimum detection limit (MDL) of 0.1 ng ml−1 has been obtained for potassium in water solutions by laser enhanced ionization (LEI) in an acetylene-air flame using a pulsed laser. The previous best reported MDL by a pulsed laser photoexcitation is 1 ng ml−1. In the present work, a transition from the first excited atomic state at 580.2 nm (4p-7s) has been used with an acetylene-air flame in place of the resonant line at 766.5 nm (4s-4p) and the cooler hydrogen-air dame used by earlier workers. A matrix ionization interference has been observed for the 580.2 nm (4p-7s) transition at K concentrations higher than 50 μg ml−1. Simultaneous determination of sodium with potassium is possible with this method since the (3s-4d) Na two-photon transition at 578.7 nm is nearby. An efficient new sitting type of split-electrode cathode is used for the investigations.
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