Al-Kindy Salma M Z, Al-Ghamari Salwa S, Suliman Fakhr Eldin O
Department of Chemistry, College of Science, Sultan Qaboos University, Al-Khod, Oman.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Dec 31;68(5):1174-9. doi: 10.1016/j.saa.2007.01.018. Epub 2007 Jan 30.
A robust and simple sequential injection (SI) method for the assay of aluminum ions in drinking water is described. The method is based on the complex formation between aluminum and 8-hydroxy-7-(4-sulfo-1-naphthylazo)-5-quinoline sulfonic acid (HSNQ). The fluorescence of the complex is monitored at an emission wavelength of 492 nm with excitation at 357 nm. The HSNQ concentration, aspirated reagent and sample volumes were optimized simultaneously using 3(3) full factorial design. The optimum operating conditions are aspirated sample and reagent volumes of 90 and 70 microL, respectively, and HSNQ concentration of 20 microM. With these conditions linear calibration curves were obtained from 100 to 800 ppb. The detection limit was 4 ppb. The maximum relative standard deviation of the method was 1.43% (n=5). The method was successfully applied for the determination of aluminum in drinking water samples.
本文描述了一种用于测定饮用水中铝离子的稳健且简单的顺序注射（SI）方法。该方法基于铝与8-羟基-7-（4-磺基-1-萘基偶氮）-5-喹啉磺酸（HSNQ）之间形成的络合物。在激发波长为357nm时，监测络合物在发射波长492nm处的荧光。使用3(3)全因子设计同时优化了HSNQ浓度、吸入的试剂和样品体积。最佳操作条件为分别吸入90和70微升的样品和试剂体积，以及20微摩尔的HSNQ浓度。在这些条件下，获得了100至800 ppb的线性校准曲线。检测限为4 ppb。该方法的最大相对标准偏差为1.43%（n = 5）。该方法成功应用于饮用水样品中铝的测定。
