The estimation of lanthanum by air-acetylene atomic absorption spectrophotometry using an indirect procedure

S. J. Wilson, P. Marquis
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引用次数: 2

Abstract

A method for measuring the release of lanthanum from some ceramic dental materials was required using air–acetylene atomic absorption spectrophotometry (AA-AAS), and an analytical procedure was devised based on the release of calcium in the presence of phosphate by lanthanum addition. The extent of phosphate interference in the determination of calcium by AA-AAS was assessed, and it was shown that the absorbance of a 10 ppm Ca standard was reduced by 45% in the presence of 20 ppm or more of phosphate (as PO4). Analysis of standards containing 10 ppm Ca, 20 ppm PO4, and lanthanum added at concentrations up to 100 ppm showed rapid increase of calcium absorbances from 10 to 40 ppm La, after which absorbance increased slowly to a constant value at 90 ppm La. This corresponded to the value of a 10 ppm Ca standard solution containing no phosphate. Closer examination of solutions containing 10–40 ppm La revealed a quantitative relationship between lanthanum levels and calcium absorbances which deviated slightly from Beer’s law. Consequent analysis of solutions containing various amounts of lanthanum in the presence of 10 ppm Ca and 20 ppm PO4 followed by repeated analysis of standards demonstrated good precision and reproducibility. The relative standard deviation for repeated standard analyses was 4.2%, and the detection limit was 0.6 ppm La representing an increase of sensitivity of approximately 100 times over lanthanum determinations using nitrous oxide–acetylene techniques. The method indicates that similar procedures may be used to estimate elements which exercise similar release effects.
空气-乙炔原子吸收分光光度法间接测定镧
采用空气-乙炔原子吸收分光光度法(AA-AAS)测定了某些牙科陶瓷材料中镧的释放量,并设计了一种以镧在磷酸盐存在下钙释放量为基础的分析方法。对AA-AAS法测定钙的磷酸盐干扰程度进行了评估,结果表明,在20 ppm或更多的磷酸盐(如PO4)存在下,10 ppm Ca标准的吸光度降低了45%。对含有10 ppm Ca、20 ppm PO4和浓度高达100 ppm镧的标准物的分析显示,钙的吸光度从10 ppm La迅速增加到40 ppm La,之后吸光度缓慢增加到90 ppm La时的恒定值。这相当于不含磷酸盐的10 ppm Ca标准溶液的值。对含有10-40 ppm La的溶液进行更仔细的检查,揭示了镧水平和钙吸光度之间的定量关系,这与比尔定律略有偏离。随后对含有不同数量镧的溶液在10 ppm Ca和20 ppm PO4的存在下进行分析,然后对标准品进行重复分析,证明了良好的精度和再现性。重复标准分析的相对标准偏差为4.2%,检出限为0.6 ppm La,灵敏度比使用氧化亚氮-乙炔技术的镧测定提高了约100倍。该方法表明,可以采用类似的方法来估计具有相似释放效应的元素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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