Fiber optic-linear array detection spectrophotometry in combination with cloud point extraction for simultaneous preconcentration and determination of cobalt and nickel.
Fiber optic-linear array detection spectrophotometry in combination with cloud point extraction for simultaneous preconcentration and determination of cobalt and nickel.
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DOI：
10.1016/j.aca.2007.08.042
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发表时间：
2007-10
影响因子：
6.2
通讯作者：
N. Shokoufi;F. Shemirani;F. Memarzadeh
中科院分区：
文献类型：
--
作者：
N. Shokoufi;F. Shemirani;F. Memarzadeh
提出了一种基于圆柱形微池的光纤线性阵列检测分光光度(FO-LADS)和浊点提取(CPE)相结合的新方法，用于不同物种的同时预富集和测定。CPE和FO-LADS方法具有良好的匹配条件，因为FO-LADS适合作为CPE后残留相体积较小的检测技术。采用50μL圆柱形微柱，用于同时预富集和测定钴、镍。浊点萃取法是基于金属离子与1-(2-吡啶偶氮)-2-萘酚(PAN)的显色反应，然后用辛基苯氧基聚乙氧基乙醇(Triton X-114)预富集形成的络合物。CPE后的残留相被转移到圆柱形微池中，并位于FO-LADS的池固定器上。用FO-LADS采集了钴、镍配合物的光谱，并对其进行了普通光谱和一阶导数光谱的处理。对不同工艺参数的优化效果进行了评价。在最佳条件下，钴和镍的线性范围分别为0.6~30.0和0.1~15.0μg l−1，检出限分别为0.2和0.0 4μg l−1。相对标准偏差(RSD)均小于4%。钴和镍的增强因子分别为198和199。将该方法与其他方法进行了比较，并应用于实际样品和加标样品的分析。
A new combined method including fiber optic-linear array detection spectrophotometry (FO-LADS) and cloud point extraction (CPE) was developed using a cylindrical micro cell for simultaneous preconcentration and determination of different species. The CPE and FO-LADS methods have good matching conditions for combination because FO-LADS is suitable as a detection technique for the low volume of remained phase obtained after CPE. This combination was carried out using 50μL cylindrical micro cell and then employed for simultaneous preconcentration and determination of cobalt and nickel. Cloud point extraction method was based on the chromogenic reaction of metal ions and 1-(2-pyridylazo)-2-naphthol (PAN) and then preconcentration of formed complexes using octylphenoxypolyethoxyethanol (Triton X-114). The remained phase after CPE was transferred into cylindrical micro cell and located at the cell holder of FO-LADS. The spectra of cobalt and nickel complexes were collected by FO-LADS and processed for ordinary and first derivative spectrophotometry. Optimization of different parameters was evaluated. Under optimum conditions, calibration curves were linear in the range of 0.6–30.0 and 0.1–15.0μgL−1with detection limits of 0.2 and 0.04μgL−1for Co and Ni respectively. The relative standard deviations (R.S.D.s) were lower than 4%. The obtained enhancement factors were 198 and 199 for cobalt and nickel, respectively. The proposed method was compared with the other methods and applied to the analysis of several real and spiked samples.