首页> 外文期刊>International journal of environmental analytical chemistry >Speciation and determination of iron using dispersive liquid-liquid microextraction based on solidification of organic drop followed by flame atomic absorption spectrometry
【24h】

Speciation and determination of iron using dispersive liquid-liquid microextraction based on solidification of organic drop followed by flame atomic absorption spectrometry

机译:基于有机液滴凝固的分散液-液微萃取-火焰原子吸收光谱法测定铁的形态和测定

获取原文
获取原文并翻译 | 示例
       

摘要

A simple and efficient method for iron speciation (Fe~(2+), Fe~(3+)) using dispersive liquid-liquid microextraction based on solidification of organic drop (DLLME-SFO) technique followed by flame atomic absorption spectrometry was developed. In this method, 1 mL of ethanol (as the disperser solvent) containing 50 μL of 1-undecanol (as the extracting solvent) was injected rapidly into the sample solution containing iron (Ⅱ), iron (Ⅲ) species and 1.1 × 10~(-3) mol L~(-1) oxine (as the complexing agent). The procedure is based on the complexation of Fe~(3+) with 8-hydroxyquinoline (oxine) at pH 3, and extraction of the resulting complex using DLLME-SFO. The total Fe was determined after the oxidation of Fe~(2+) to Fe~(3+) with concentrated nitric acid. The concentration of Fe~(2+) was determined from the difference between the concentration of total Fe and the Fe~(3+). Some parameters such as pH, oxine concentration, ratio of disperser and extractant solvent were investigated. Under the optimum conditions, the calibration graph was linear in the range of 25-250 μg L~(-1) for Fe~(3+) with a limit of detection (LOD) of 4.8 μg L~(-1). The relative standard deviation (RSD, %) for 10 replicate determinations of Fe~(3+) at 50 ug L~(-1) levels was 3.2%. To validate the developed method, a certified reference material (BRGM R52) was analysed and the determined value was in very good agreement with the certified value. The proposed method was successfully employed for determination of iron species in tap, well and spring water samples.
机译:提出了一种基于有机液滴固化的分散液-液微萃取法(DLLME-SFO),然后采用火焰原子吸收光谱法测定铁形态(Fe〜(2 +),Fe〜(3+))的简单有效的方法。在该方法中,将含有50μL1-十一醇(作为萃取溶剂)的1 mL乙醇(作为分散溶剂)快速注入到含铁(Ⅱ),铁(Ⅲ)和1.1×10〜的样品溶液中。 (-3)mol L〜(-1)肟(作为络合剂)。该程序基于Fe〜(3+)与pH值为3的8-羟基喹啉(oxine)的络合,并使用DLLME-SFO萃取所得的络合物。用浓硝酸将Fe〜(2+)氧化为Fe〜(3+)后,测定总Fe。根据总Fe和Fe〜(3+)的浓度之差确定Fe〜(2+)的浓度。研究了一些参数,例如pH,oxine浓度,分散剂和萃取剂的比例。在最佳条件下,Fe〜(3+)的校正曲线在25-250μgL〜(-1)范围内呈线性,检出限(LOD)为4.8μgL〜(-1)。在50 ug L〜(-1)浓度下重复测定10次Fe〜(3+)的相对标准偏差(RSD,%)为3.2%。为了验证开发的方法,分析了认证的参考物质(BRGM R52),测定值与认证值非常吻合。该方法成功用于自来水,井水和泉水样品中铁的测定。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号