Environment and Nanochemistry Department, Research Institute of Environmental Sciences, International Center for Science, High Technology & Environmental Sciences, Kerman, Iran. daryoush
Anal Chim Acta. 2011 Jan 17;684(1-2):45-9. doi: 10.1016/j.aca.2010.11.003. Epub 2010 Nov 9.
In the present work, dispersive liquid-liquid microextraction based on solidification of floating organic drop was developed as a simple and rapid technique for separation of silver ions from aqueous samples. In this technique, 700 μL 0.02% of 5-(4'-dimethylamino benzyliden)-rhodanine (chelating agent) was added into the 10 mL analyte sample in a test tube and 30.0 μL 1-undecanol (extraction solvent) was injected shortly thereafter. The test tubes were sonicated, centrifuged and then some effective parameters on extraction and complex formation, such as type and volume of extraction and disperser solvent, pH, the amount of chelating agent and extraction time were optimized. The effect of the interfering ions on the analytes recovery was also investigated. The calibration graph was linear in the range of 0.10-10.0 ng mL(-1) with detection limit of 0.056 ng mL(-1) (n=8). The relative standard deviation (RSD) was ±4.3% (n=8, C=5.0 ng mL(-1)) and the enrichment factor was 250.0. The proposed method was applied for extraction and determination of silver in different water samples.
在本工作中，发展了基于悬浮液滴固化的分散液-液微萃取作为一种从水样中分离银离子的简单快速技术。在该技术中，将 700μL0.02%的 5-(4'-二甲氨基苯亚甲基）-罗丹宁（螯合剂）加入到试管中的 10mL 分析物样品中，随后立即注入 30.0μL1-十一醇（萃取溶剂）。试管经超声处理、离心后，对萃取和络合形成的一些有效参数（如萃取和分散溶剂的类型和体积、pH 值、螯合剂用量和萃取时间）进行了优化。还研究了干扰离子对分析物回收率的影响。校准曲线在 0.10-10.0ngmL(-1)范围内呈线性，检测限为 0.056ngmL(-1)（n=8）。相对标准偏差（RSD）为±4.3%（n=8，C=5.0ngmL(-1)），富集因子为 250.0。该方法用于不同水样中银的萃取和测定。
