Kagaya Shigehiro, Malek Zanariah Abdul, Araki Yasuko, Hasegawa Kiyoshi
Department of Chemical and Biochemical Engineering, Faculty of Engineering, Toyama University, Gofuku, Toyama 930-8555, Japan.
Anal Sci. 2002 Aug;18(8):923-6. doi: 10.2116/analsci.18.923.
By applying an internal standardization, we could use a rapid coprecipitation technique using lanthanum phosphate as a coprecipitant for preconcentration of iron(III) and lead in their flame atomic absorption spectrometric determination. Indium as an internal standard was added to the initial sample solution together with lanthanum and phosphoric acid; the coprecipitation of iron(III) and lead was then carried out at pH about 3. After measuring the atomic absorbances of iron, lead, and indium in the final sample solution, we determined the contents of iron(III) and lead in the original sample solution by using the internal standardization with indium. In this method, complete collection of the precipitate was not required after the coprecipitation of iron(III), lead, and indium, because the ratio of the recovery of iron(III) or lead to that of indium was almost constant regardless of the recovery of the precipitate. This method was simple and rapid, and was available for the determination of 2-300 micrograms L-1 of iron(III) and 5-400 micrograms L-1 of lead in some water samples.
通过应用内标法，我们可以使用一种快速共沉淀技术，该技术以磷酸镧作为共沉淀剂，用于在火焰原子吸收光谱法测定铁（III）和铅时进行预富集。将铟作为内标与镧和磷酸一起加入初始样品溶液中；然后在pH约为3的条件下进行铁（III）和铅的共沉淀。在测量最终样品溶液中铁、铅和铟的原子吸光度后，我们通过使用铟的内标法测定原始样品溶液中铁（III）和铅的含量。在该方法中，铁（III）、铅和铟共沉淀后不需要完全收集沉淀，因为无论沉淀的回收率如何，铁（III）或铅的回收率与铟的回收率之比几乎是恒定的。该方法简单快速，可用于测定某些水样中2 - 300微克/升的铁（III）和5 - 400微克/升的铅。
