Rahman Mohammad Arifur, Kaneco Satoshi, Amin Md Nurul, Suzuki Tohru, Ohta Kiyohisa
Department of Chemistry for Materials, Faculty of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
Talanta. 2004 Apr 19;62(5):1047-50. doi: 10.1016/j.talanta.2003.10.035.
A preconcentration method for silver in environmental waters involving adsorption on a tungsten wire, followed by electrothermal atomic absorption spectrometry with a tungsten tube atomizer is described. The optimal immersing time was 90s. The best pH for the adsorption of silver was 3. Under the optimal conditions, the detection limit for silver by the tungsten wire preconcentration method was 5.0ngl(-1) (3S/N) and the relative standard deviation was 8.2%. The effects of large amounts of concomitants on the preconcentration of silver were evaluated. Even though 10(3)- to 10(4)-fold excess of matrix elements existed in water, the silver response was not significantly affected by the matrix elements. The method with preconcentration on a tungsten wire was applied to the determination of silver in waters and proved to be sensitive, simple, and convenient. This adsorption method can be utilized in in situ sampling of ultra-trace silver in environmental samples (waters). Furthermore, after sampling it is easy to carry and store the tungsten wire without contamination for a long time.
本文描述了一种用于环境水样中银的预富集方法，该方法包括将银吸附在钨丝上，然后使用钨管原子化器进行电热原子吸收光谱测定。最佳浸泡时间为90秒。银吸附的最佳pH值为3。在最佳条件下，钨丝预富集法测定银的检出限为5.0ngl(-1)（3S/N），相对标准偏差为8.2%。评估了大量共存物对银预富集的影响。即使水中存在10(3)至10(4)倍过量的基体元素，银的响应也不会受到基体元素的显著影响。钨丝预富集法应用于水样中银的测定，结果表明该方法灵敏、简单且方便。这种吸附方法可用于环境样品（水样）中超痕量银的原位采样。此外，采样后钨丝易于携带和长时间储存且不受污染。
