Simultaneous correction of scattering in ICP-excited atomic fluorescence spectrometry

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Abstract

A method for correcting the scattering in atomic fluorescence spectrometry excited by an inductively coupled argon plasma source is described. Unlike the sequential method so far proposed in the literature, it is shown here that by aspirating into the plasma a solution containing both the analyte and the element used to monitor the scattering signal, the correction can be achieved simultaneously by subtracting the signals obtained with two high luminosity monochromators, facing the flame and each other in opposite directions. This subtraction is accomplished with a home-made, two channel differential lock-in amplifier. The system is calibrated, as in the sequential method, by aspirating a pure scattering solution into the flame. The effectiveness of the method is demonstrated for cadmium atomized in a separated air-acetylene flame in the presence of a 106-fold excess of aluminium.

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1

Perkin Elmer Italiana, Milano, Italy.

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