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Abstract
Pyrocatechol violet and thiocyanate methods used in the water analysis for spectrophotometric determination of aluminum (Al) and iron (Fe), respectively, were modified for the determination of these elements in different types of commonly used extracts of soils and sediments. The extracts were digested with nitric and perchloric acid in an Al-heating block as for the total phosphorus (P) analysis and aliquots of the digests were analyzed for Al and Fe. Comparison of the spectrophotometric methods with inductively coupled plasma method was demonstrated using (I) oxalate, citrate-dithionite, and pyrophosphate extracts of 25 samples of acid forest soils, and (ii) water, sodium hydroxide, dithionitebicarbonate, and hydrochloric acid extracts of eight fresh water sediments.
ACKNOWLEDGMENTS
We thank to Dr. M. Poth from USDA Forest Service Research, Riverside, CA for useful comments and language improvements. We are grateful to our colleagues V. Hejzlarová, J. Švehla, and F. Hezina for laboratory assistance. The study was partly supported by the Grant Agency of the Czech Republic, projects 206/97/0072 and 206/00/0063.