Abstract
The reliability of the isotope dilution technique applied to diode laser graphite furnace atomic absorption spectrometry was tested by the determination of the Rb content in a NIST (National Institute of Standards and Technology) reference water (SRM 1640). For the measurements, the NIST water was spiked with different amounts of 87Rb. The signals of both naturally occurring Rb isotopes, 85Rb and 87Rb, were measured simultaneously by the use of two diode lasers. A total Rb content of 1.97 ± 0.03 ng ml−1 was found which compares very well with the reference value of 2.00 ± 0.02 ng ml−1.
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