Abstract
A fractional factorial design has been used to explore the variables that affect microwave dissolution using perfluoroalkoxy (PFA)-Teflon digestion vessels. Optimum operating conditions for National Research Council of Canada, certified reference material TORT-1 Lobster Hepatopancreas and National Institute of Standards and Technology, Standard Reference Material (SRM) 1575 Pine Needles, were obtained using this procedure. The optimum conditions found for each variable are: 0.25 g sample mass, 6 ml of concentrated hydrochloric acid, 6 ml of concentrated nitric acid, 3 ml of concentrated hydrofluoric acid and 90% microwave power for a total dissolution time of 15 min. Results for Ca, Fe, Cu and Zn in TORT-1 and Ca and Fe in SRM 1575 were in agreement with the certified values.
Original language | English |
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Pages (from-to) | 1743-1748 |
Journal | Analyst |
Volume | 117 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 1992 |
Keywords
- Acid digestion
- Biological material
- Direct current plasma atomic emission spectrometry
- Fractional factorial design
- Microwave dissolution