酸性高锰酸钾化学发光流动注射法测定海水样品中的钒
Flow-injection determination of vanadium in seawater samples with acidic potassium permanganate chemiluminescence.
作者信息
Waseem Amir, Yaqoob Mohammad, Nabi Abdul
机构信息
Department of Chemistry, University of Balochistan, Quetta, Pakistan.
出版信息
Anal Sci. 2010;26(3):355-60. doi: 10.2116/analsci.26.355.
Chemiluminescence from the vanadium and potassium permanganate reaction was studied under acidic conditions to develop a sensitive method for vanadium determination using the formaldehyde enhancement effect. The method was successfully applied to the determination of vanadium in seawater. Experimental parameters were optimized, including acid concentration, potassium permanganate and formaldehyde concentration. A linear calibration graph was obtained in the concentration range of 2.0 x 10(-9)-5 x 10(-6) M with relative standard deviations (n = 4) in the range of 1.8-3.1%. The detection limit (3sigma blank) was 8.0 x 10(-10) mol L(-1) with a sample throughput of 100 h(-1). The effect of salinity and various interfering cations and anions were studied. The method was applied to determine total dissolved vanadium in seawater samples and certified reference materials after online reduction with amalgamated zinc column.
研究了在酸性条件下钒与高锰酸钾反应产生的化学发光，以利用甲醛增强效应开发一种灵敏的钒测定方法。该方法成功应用于海水中钒的测定。对实验参数进行了优化，包括酸浓度、高锰酸钾和甲醛浓度。在2.0×10⁻⁹ - 5×10⁻⁶ M的浓度范围内获得了线性校准曲线，相对标准偏差（n = 4）在1.8 - 3.1%范围内。检测限（3σ空白）为8.0×10⁻¹⁰ mol L⁻¹，样品通量为100 h⁻¹。研究了盐度以及各种干扰阳离子和阴离子的影响。该方法应用于通过汞齐化锌柱在线还原后测定海水样品和有证标准物质中的总溶解钒。
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