Department of Analytical Chemistry, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), International Campus of Global Excellence (Cei·Mar), University of Cádiz, Av. República Saharaui, Puerto Real, 11510 Cádiz, Spain.
Department of Analytical Chemistry, Faculty of Marine and Environmental Sciences, Instituto Universitario de Investigación Marina (INMAR), International Campus of Global Excellence (Cei·Mar), University of Cádiz, Av. República Saharaui, Puerto Real, 11510 Cádiz, Spain.
Sci Total Environ. 2019 Feb 10;650(Pt 1):27-33. doi: 10.1016/j.scitotenv.2018.08.438. Epub 2018 Aug 31.
Ag can be found in the ocean at the ultra-trace level, mainly as AgCl and complexed by dissolved organic matter (Ag-DOM). However, methods for studying Ag speciation in marine waters are limited by the lack of extractants capable to separate organic and inorganic silver species in natural conditions of seawater samples. In this work, a two-phase solvent bar micro-extraction method using the ionic liquid trihexyltetradecylphosphonium chloride (Cyphos® 101) was applied for selective micro-extraction of AgCl from organic silver in marine waters, working at seawater pH,. The application to real samples was performed under the following conditions: 2.5% Cyphos® 101 in kerosene solution with 10% dodecan-1-ol inside the fiber, and 30 min of sample extraction at a stirring rate of 800 rpm. The proposed SBME was successfully used for estimation of Ag fractions in waters from the Bay of Cádiz (South-west Spain) showing its applicability for a simple, fast and environmentally friendly speciation of silver in marine water samples. The method presented a linear response up to 500 ng L and a detection limit of 0.4 ng L, using GF-AAS for instrumental determination.
银在海洋中以超痕量水平存在，主要以 AgCl 的形式存在，并与溶解的有机物（Ag-DOM）络合。然而，研究海洋水中银形态的方法受到限制，因为缺乏能够在海水样品的自然条件下分离有机和无机银物种的萃取剂。在这项工作中，采用两相溶剂棒微萃取法，使用离子液体三辛基十四烷基膦氯化物（Cyphos® 101），从海洋水中的有机银中选择性地微萃取 AgCl，在 pH 值为的海水中工作。实际样品的应用在以下条件下进行：在纤维内含有 2.5%Cyphos® 101 的煤油溶液和 10%十二烷-1-醇，在 800rpm 的搅拌速度下提取 30 分钟。该方法成功地用于估计来自西班牙西南部卡迪斯湾（Bay of Cádiz）的水样中的银分数，表明其适用于海洋水样中银的简单、快速和环境友好的形态分析。该方法使用 GF-AAS 进行仪器测定，在线性响应范围内高达 500ng/L，检测限为 0.4ng/L。
