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2006•Journal of Analytical ScienceRequires access

Catalytic Spectrophotometic Determination of Trace Manganese

Guo Xiu-min

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Abstract

A new kinetic spectrophotometric method for the determination of trace amount of Mn(Ⅱ) has been described.The method is based on a new indicator reaction of Mn catalyzing oxidation of Light Green SF by potassium periodate in the presence of nitrilo triacetic acid as an activator.The reaction is monitored spectrophotometically by measuring the absorbance decrease at 650 nm. The linear range for Mn(Ⅱ) is 0.6~6 ng/mL,and the detection limit is 6.0×10~(-11) g/mL.The method is of high sensitivity,selectivity and simplicity.The method has been used to determine trace Mn in water and wine samples with satisfactory results,and the RSD is 2.5%(n=9).

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What this paper is about

A new kinetic spectrophotometric method for the determination of trace amount of Mn(Ⅱ) has been described.The method is based on a new indicator reaction of Mn catalyzing oxidation of Light Green SF by potassium periodate in the presence of nitrilo triacetic acid as an activator.The reaction is monitored spectrophotometically by measuring the absorbance decrease at 650 nm. The linear range for Mn(Ⅱ) is 0.6~6 ng/mL,and the detection limit is 6.0×10~(-11) g/mL.The method is of high sensitivity,selectivity and simplicity.The method has been used to determine trace Mn in water and wine samples with satisfactory results,and the RSD is 2.5%(n=9).

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Available abstract

A new kinetic spectrophotometric method for the determination of trace amount of Mn(Ⅱ) has been described.The method is based on a new indicator reaction of Mn catalyzing oxidation of Light Green SF by potassium periodate in the presence of nitrilo triacetic acid as an activator.The reaction is monitored spectrophotometically by measuring the absorbance decrease at 650 nm. The linear range for Mn(Ⅱ) is 0.6~6 ng/mL,and the detection limit is 6.0×10~(-11) g/mL.The method is of high sensitivity,selectivity and simplicity.The method has been used to determine trace Mn in water and wine samples with satisfactory results,and the RSD is 2.5%(n=9).

Key concepts: Chemistry, Potassium periodate, Detection limit, Absorbance, Manganese, Linear range, Catalysis, Selectivity

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