Spectrophotometric determination of magnesium(II) with emodin (1,3,8-trihydroxy-6-methylanthraquinone)
- 1 January 1992
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 117 (4) , 791-793
- https://doi.org/10.1039/an9921700791
Abstract
A spectrophotometric method for the determination of trace amounts of MgII is described. Magnesium(II) forms a coloured complex with emodin (1,3,8-trihydroxy-6-methylanthraquinone) in basic medium and can be determined in the presence of several cations and anions. Beer's law is obeyed down to a concentration of 0.15 µ ml–1 with a molar absorptivity of 2.3 × 103dm3 mol–1 cm–1 at 553 nm. The method was applied to the analysis of various samples containing trace amounts of MgII.Keywords
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