A new kinetic method for the determination of magnesium and its application to natural waters |
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Authors: | M Ternero F Pino DPérez Bendito M Valcárcel |
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Institution: | 1. Department of Analytical Chemistry, Faculty of Sciences, University of Sevilla, Sevilla, Spain;1. Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba, Spain |
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Abstract: | A kinetic method is described for the determination of trace amounts of magnesium in the presence of calcium. The procedure is based on the inhibition of the manganese(II) catalyzed aerial oxidation of 1,4-dihydroxyphthalimide dithiosemicarbazone reaction by 2. Effect of Transition Metals aTransition metal | Concentration (M) | Percentage inhibition | Mg(II) found (×l05M) | Fe(II) | 3.6.10?5 | 54.1 | 4.62 | Fe(III) | 3.6.10?5 | 47.8 | 4.48 | Co(II) | 3.4.10?5 | 50.0 | 4.53 | Ni(II) | 3.4.10?5 | 50.0 | 4.53 | Cu(II) | 3.1.10?5 | 52.0 | 4.56 | Zn(II) | 3.0.10?5 | 54.1 | 4.62 | Cd(II) | 1.7.10?5 | 52.0 | 4.56 | Hg(II) | 9.9.10?6 | 45.8 | 4.44 | Sn(II) | 2.1.10?6 | 50.0 | 4.52 | Pb(II) | 1.2.10?6 | 54.1 | 4.62 |
3. Determination of Magnesium in Natural Waters | | | Mg(II) found (M)b | Natural water | Ca(II) presenta | | Atomic absorption | sample | M | Kinetic absorption | method | Commercial | 3.45 · 10?4 | 1.65 · 10?3 | 1.74 · 10?3 | Commercial | 5.46 · 10?4 | 1.57 · 10?4 | 1.81 · 10?4 | Untreated | 6.13 · 10?4 | 2.16 · 10?4 | 2.40 · 10?4 | Treated | 4.95 · 10?4 | 1.93 · 10?4 | 2.17 · 10?4 |
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