Chemistry Department, Faculty of Art and Science, Yıldız Technical University, 34210, İstanbul, Turkey.
Department of Science Education, Faculty of Education, Yıldız Technical University, 34210, İstanbul, Turkey.
Environ Monit Assess. 2018 Jun 27;190(7):437. doi: 10.1007/s10661-018-6735-y.
This study describes the determination of trace levels of copper by slotted quartz tube atomic absorption spectrometry after dispersive liquid-liquid microextraction. A ligand synthesized from the reaction of salicylaldehyde and 1-naphthylamine was used to form coordinate copper complex prior to extraction. All parameters that influence the output of complex formation, extraction, and instrumental measurement were optimized to enhance the absorbance signal of copper. Under the optimum conditions, about 104-fold enhancement in sensitivity was recorded over the conventional flame atomic absorption spectrometer, corresponding to a 0.51 ng/mL detection limit. The percent relative standard deviation calculated for the lowest concentration (4.8%) indicated high precision for the experimental procedure. Accuracy and applicability of the optimum method were determined by performing spiked recovery tests on urine, lake water, and mineral water samples. Satisfactory recovery results were obtained between 82.2 and 106.3% at four different concentrations. Matrix matching method was also performed to increase the accuracy of quantification, and the percent recovery calculated for 175 ng/mL was 105.14%.
本研究描述了采用槽形石英管原子吸收光谱法在分散液-液微萃取后测定痕量铜。在萃取前，用水杨醛和 1-萘胺反应合成的配体形成配位铜络合物。优化了影响络合物形成、萃取和仪器测量的所有参数，以增强铜的吸光度信号。在最佳条件下，与传统火焰原子吸收光谱仪相比，灵敏度提高了约 104 倍，检测限为 0.51ng/mL。对于最低浓度（4.8%）计算的相对标准偏差（%RSD）表明实验程序具有高精度。通过对尿液、湖水和矿泉水样品进行加标回收试验，确定了最佳方法的准确性和适用性。在四个不同浓度下，回收率在 82.2%至 106.3%之间，结果令人满意。还采用基体匹配法来提高定量的准确性，计算得出 175ng/mL 时的回收率为 105.14%。
