Chemical composition of Fly ash by Inductively Coupled Plasma/Optical Emission Spectroscopy (ICP/OES)

1. The fly ash sample was totally digested by gently heating 0.25g of the sample in a mixture of HF/HNO3/HClO4 in a Teflon beaker on a hot plate until dry.
2. The residue was then dissolved in 5% HNO3 and topped to 15 ml with deionized water for analysis by Perkin Elmer Optima 3000 DV inductively coupled plasma/optical emission spectrometer (ICP/OES).
3. This was used to determine the major element oxides, with the exception of SiO2, and the larger suite of trace elements. 0.10 g of fly ash sample was also digested with 2.25 ml of a mixture of 9 parts HNO3 with 1 part HCl for 1 hour at 95°C in a boiling water bath and topped to 15 ml with deionized water for analysis by the ICP/OES.
4. This method was used to determine the smaller suite of trace elements.
5. The SiO2 portion was obtained by fusing 0.10 g of the fly ash sample with 1.00 g of lithium metaborate at 1000°C for 1 hour.
6. The residue was dissolved in dilute HNO3 topped to 100 ml with deionized water and then analyzed by the ICP/OES.

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