An improved spectrophotometric determination of manganese(II) with 1-(2-quinolylazo)-2,4,5-trihydroxybenzene with applications to medicinal plants and chemical reagents |
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Authors: | Abdulhameed AR Laila |
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Institution: | Chemistry Department, Birzeit University, Birzeit, West Bank Israel |
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Abstract: | The effects of organic solvent, time and temperature on the colour-forming reaction are described. For nine solvents tested, the molar absorptivities were in the range 2.0×104?6.7×104 mol?1 cm?1; best sensitivity was obtained with a 1:1 water/2-propanol solution after a standing time of 35 min; temperature should be controlled to ±2°C. Beer's law was obeyed for 0–1.45 μg ml?1 Mn(II). The improved method was applied to determinations of manganese(II) in various herbs and chemical reagents; the values found were in the range 5.4–48.4 μg g?1 in herbs, and 0.001-0.012% (w/w) in reagents. |
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