Highly selective and sensitive preconcentration of mercury ion and determination by cold vapor atomic absorption spectroscopy
Highly selective and sensitive preconcentration of mercury ion and determination by cold vapor atomic absorption spectroscopy
复制标题
DOI：
10.1080/00032710600622167
复制
发表时间：
2006-01-01
影响因子：
2
通讯作者：
Shajarat, F
中科院分区：
文献类型：
--
作者：
Ghaedi, M;Fathi, MR;Shajarat, F
以2-巯基苯并恶唑（MBO）修饰的十二烷基硫酸钠（SDS）修饰的Chromosorb P为基体，通过与MBO的络合作用，实现了对超痕量汞离子的选择性分离和富集，并建立了冷原子吸收光谱法（CVAAS）测定汞离子的方法。而保留的Hg 2+离子随后用最少量的2 M硝酸的丙酮溶液从柱上剥离。将洗脱液送至CV-AAS用于评估Hg 2+离子含量，结果表明Hg 2+离子在0.05-85.6 ng mL（-1）和0.09-9.6 μ g mL（-1）范围内的校准曲线呈线性。用40毫克的配体修饰的SDS-涂层的chromosorb的最大容量被认为是49830 μ g的汞（II），检测限为0.01 ng/mL（-1），和富集因子约为300，这使得它适合于稀溶液分析。方法用于真实的样品中Hg ~（2+）含量的测定，结果满意。
A simple and selective method based on a sodium dodecyl sulfate (SDS)-coated chromosorb P modified by 2-mercaptobenzoxazole (MBO) has been developed to selectively separate and concentrate ultra trace amounts of mercury(II) ions for its highly sensitive measurement by cold vapor atomic absorption spectrometry (CVAAS).The mercury ions were adsorbed quantitatively on SDS-coated chromosorb due to its complexation with MBO, while the retained Hg2+ ions were then stripped from the column with minimal amounts of 2 M nitric acid in acetone. The eluting solution was sent to CV-AAS for evaluating Hg2+ ion content and results indicate that the calibration curve was linear for Hg2+ ion in the range of 0.05-85.6 ng mL(-1) and 0.09-9.6 mu g mL(-1) of Hg2+ ions. Maximum capacity of the SDS-coated chromosorb modified with 40 mg of the ligand was found to be 49830 mu g of mercury(II), the limit of detection was 0.01 ng mL(-1) , and enrichment factors were about 300, which make it suitable it for dilute solution analysis. The method was successfully applied to the determination of Hg2+ ion content in real samples.