Anthemidis Aristidis N, Zachariadis George A, Stratis John A
Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, Thessaloniki 54124, Greece.
Talanta. 2004 Nov 15;64(4):1053-7. doi: 10.1016/j.talanta.2004.05.003.
A simple and robust time-based on-line sequential injection system for trace mercury determination via cold vapour atomic absorption spectrometry (CVAAS), employing a new integrated gas-liquid separator (GLS), which in parallel operates as reactor, was developed. Sample and reductant are sequentially loaded into the GLS while an argon flow delivers the released mercury vapour through the atomic absorption cell. The proposed method is characterized by the ability of successfully managing variable sample volume up to 30ml in order to achieve high sensitivity. For 20ml sample volume, the sampling frequency is 25h(-1). The calibration curve is linear over the concentration range 0.05-5.0mugl(-1) of Hg(II), the detection limit is c(L) = 0.02mugl(-1), and the relative standard deviation is s(r) = 2.6% at 1.0mugl(-1) Hg(II) level. The performance of the proposed method was evaluated by analyzing certified reference material and applied to the analysis of natural waters and biological samples.
开发了一种简单且稳健的基于时间的在线顺序注射系统，用于通过冷蒸气原子吸收光谱法（CVAAS）测定痕量汞，该系统采用了一种新型集成气液分离器（GLS），它同时作为反应器运行。样品和还原剂被顺序加载到GLS中，同时氩气流将释放出的汞蒸气输送通过原子吸收池。所提出的方法的特点是能够成功处理高达30ml的可变样品体积，以实现高灵敏度。对于20ml的样品体积，采样频率为25h⁻¹。校准曲线在Hg(II)浓度范围0.05 - 5.0μg l⁻¹内呈线性，检测限为c(L)=0.02μg l⁻¹，在1.0μg l⁻¹ Hg(II)水平下相对标准偏差为s(r)=2.6%。通过分析有证标准物质对所提出方法的性能进行了评估，并将其应用于天然水和生物样品的分析。
