Almertaha Abdul-Hossein, Eftekhari Mohammad, Chamsaz Mahmoud, Gheibi Mohammad
a Department of Chemistry , Ferdowsi University of Mashhad , Mashhad , Iran.
b Department of Chemistry, Faculty of Sciences , University of Neyshabur , Neyshabur , Iran.
Environ Technol. 2019 Jun;40(14):1831-1839. doi: 10.1080/09593330.2018.1430854. Epub 2018 Feb 2.
In this paper, Mentha pulegium leaves extract was used as a green reducing agent for the synthesis of silver-nanoparticles. The synthesized silver-nanoparticles were characterized by UV-VIS spectrophotometry, transmission electron microscopy, X-ray spectroscopy and used as an adsorbent for preconcentration of trace levels of cadmium (ІІ). After the desorption of cadmium (ІІ) in 5 mol L formic acid, the desorbent solution was aspirated into the flame atomic absorption spectrometry for the determination of cadmium. In order to optimize the experimental condition, a response surface methodology based on central composite design was used. The optimum conditions are: pH: 8.6, amounts of adsorbent: 30 mg, 10 min extraction time and desorption time of 2 min. Under the optimum condition, the calibration curve was linear in the range of 5-200 μg L cadmium (ІІ) ion with a correlation coefficient of 0.9995. The limit of detection was 1.1 μg L and the relative standard deviation for 25 μg L cadmium (ІІ) ion was 3.0% (n = 5). In order to check the applicability of the proposed method, different real samples were analyzed. Also, the accuracy of this method was successfully checked by the analysis of certified reference material and spike tests.
本文中，唇萼薄荷叶提取物被用作合成银纳米颗粒的绿色还原剂。合成的银纳米颗粒通过紫外可见分光光度法、透射电子显微镜、X射线光谱进行表征，并用作痕量镉（Ⅱ）预富集的吸附剂。镉（Ⅱ）在5 mol/L甲酸中解吸后，将解吸液吸入火焰原子吸收光谱仪中测定镉。为了优化实验条件，采用了基于中心复合设计的响应面法。最佳条件为：pH值8.6、吸附剂用量30 mg、萃取时间10 min、解吸时间2 min。在最佳条件下，镉（Ⅱ）离子校准曲线在5 - 200 μg/L范围内呈线性，相关系数为0.9995。检测限为1.1 μg/L，25 μg/L镉（Ⅱ）离子的相对标准偏差为3.0%（n = 5）。为检验所提方法的适用性，对不同实际样品进行了分析。此外，通过分析有证标准物质和加标试验成功检验了该方法的准确性。
