示差パルスカソーディックストリッピングボルタンメトリーによる鋼中微量マンガンの簡易迅速定量

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Manganese at the μg/g level in steel is determined by differential pulse cathodic stripping voltammetry in a strongly acidic sample solution without separating iron matrix. The method is based on the accumulation and subsequent stripping of hydrated manganese (IV) oxide on a platinum disk electrode. Optimum experimental conditions include the use of a 2 ml aliquot of the 0.23 M nitric-0.18M sulfuric acid mixture electrolyte containing 2 mg of a sample, and pre-electrolysis at +1.45 V vs. SCE followed by a negative-going scan at a rate of 200 mV/s to +0.65V vs. SCE. The peak height of manganese decreased with increasing the amount of iron (III) in the electrolyte and increased linearly with pre-electrolysis time until the electrode surface became saturated. The determination range could broaden by using manganese-free acids and longer pre-electrolysis times ; thus the calibration graphs were linear between 1.8×10^<-8> and 1×10^<-4> M of manganese (II), within 600 s pre-electrolysis, and passed through the origin. Possible interferences are evaluated. The determination of 2.8 to 4280 μg/g of manganese in steels was achieved with relative standard deviations of less than 6% (n=10) within 15 min. The detection limit is 0.3 μg/g for a pre-electrolysis time of 600 s. The proposed method is more suitable than the commonly used JIS methods (G 1213 and G 1257) for the determination of trace manganese in steel from the viewpoints of simplicity, less experimental skill, rapidity and high sensitivity as well as excellent precision.
社団法人日本鉄鋼協会の論文
1996-11-01

示差パルスカソーディックストリッピングボルタンメトリーによる鋼中微量マンガンの簡易迅速定量

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