Abstract

Inductively coupled plasma-mass spectrometry (ICP-MS) was used to measure ng/L quantities of uranium in solution. Pneumatic nebulization and ultrasonic nebulization were compared. The spectral integration period was varied to study the effects of counting statistics. Analyte detection at <i>m/<i>z</i></i> 238 was found to be blank limited. Under optimal conditions (i.e., with the use of ultrasonic nebulization and an 11-s integration period per <i>m/z</i>), uranium detection limits (3σ) at <i>m/z</i> 234 (not blank limited) were found to be 0.1 ng/L in 18-MΩ water. The uranium detection limit at <i>m/z</i> 234 was 0.5 ng/L when a 2.5-g/L NaNO₃ solution was nebulized. Normalized instrument response for uranium in 18-MΩ water agreed well with that in 2.5-g/L NaNO_3.

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