Abstract
Ion chromatography with sequential inductively coupled plasma emission spectroscopy (SICP) detection was employed to determine chromium, molybdenum, manganese and nickel in certified samples, after digestion with nitric acid. The use of ion chromatography eliminated spectral interference problems from iron emissions normally encountered with plasma emission systems for analysis of such samples. Ion chromatography combined with SICP allowed these elements to be determined at their wavelength of maximum emission. Although the emission signals were transient, a low-cost sequential spectrometer could be utilized since enough time existed to make a determination and then drive the instrument's monochromator to the wavelength of the next element of interest before it was eluted from the column. The determined concentrations of all elements were very close to the values reported for the certified samples, except for chromium determinations, which were not quantitative.
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