Bianchin Joyce Nunes, Martendal Edmar, Carasek Eduardo
Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis 88040-900, SC, Brazil.
J Autom Methods Manag Chem. 2011;2011:839365. doi: 10.1155/2011/839365. Epub 2011 Jun 28.
A new method for Ag determination in water samples using solid phase extraction (SPE) coupled to a flow injection system and flame atomic absorption spectrometry was developed. The sorbent used for Ag preconcentration and extraction was the termite digestion product. Flow and chemical variables of the system were optimized through a multivariate procedure. The factors selected were adsorbent mass, buffer type and concentration, sample pH, and sample flow rate. The detection limit and precision were 3.4 μg L(-1) and 3.8% (n = 6, 15 μg L(-1)), respectively. The enrichment factor and the linear working range were, respectively, 21 and 10-50 μg L(-1). Results for recovery tests using different water samples were between 96 and 107%. The proposed methodology was applied with success for the determination of Ag in water used to wash clothes impregnated with silver nanoparticles, supplied by a factory located in Santa Catarina, Brazil.
开发了一种结合固相萃取（SPE）、流动注射系统和火焰原子吸收光谱法测定水样中银的新方法。用于银预富集和萃取的吸附剂是白蚁消化产物。通过多变量程序对系统的流量和化学变量进行了优化。选择的因素有吸附剂质量、缓冲液类型和浓度、样品pH值以及样品流速。检测限和精密度分别为3.4μg L⁻¹和3.8%（n = 6，15μg L⁻¹）。富集因子和线性工作范围分别为21和10 - 50μg L⁻¹。使用不同水样进行回收率测试的结果在96%至107%之间。所提出的方法成功应用于测定巴西圣卡塔琳娜州一家工厂提供的用于洗涤浸渍银纳米颗粒衣物的水中的银。
