...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Microchemical Journal: Devoted to the Application of Microtechniques in all Branches of Science >Ultrasound-assisted purge-and-trap extraction for simultaneous determination of low-molecular weight amines and ammonium in high salinity waters by ion chromatography
【24h】

Ultrasound-assisted purge-and-trap extraction for simultaneous determination of low-molecular weight amines and ammonium in high salinity waters by ion chromatography

机译：通过离子色谱法同时测定高盐度水中低分子量胺和铵的超声辅助吹扫和捕集萃取

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Direct determination of ammonium and amines in high salinity water samples by ion chromatography using conductivity detection is impossible due to the presence of high potassium and sodium concentrations. This work describes a simple and fast method for the determination of ammonium, monomethylamine and monoethylamine in high salinity waters by ion chromatography. An ultrasound-assisted purge-and-trap extraction system was used to eliminate matrix interferences. This system was optimized using a full two-level factorial (23) design followed by a two-level factorial (22) design. In the first factorial design, the variables: extraction time, concentration of sodium hydroxide solution and analyte mass were tested. In the second factorial design, the mass of each analyte was maintained constant. Parameters of the analytical curves, prepared in different matrices: sulfuric solution and extracts from working standard solutions prepared in water and saline solution were compared. Limits of detection of 0.02, 0.03 and 0.03 mg L-1 were found for ammonium, monomethylamine and monoethylamine, respectively. Saline waters from Brazilian oil industry, pre-treated to remove nitrogen compounds, were analyzed. Satisfactory recoveries (93-111%) of the analytes were obtained for all spiked samples. Precision was <= 10% (n = 3). The proposed method is adequate for analyzing saline waters containing sodium to ammonium, monomethylamine and monoethylamine concentration ratios up to 56,000:1 and potassium to ammonium, monomethylamine and monoethylamine concentration ratios up to 24,000:1. (C) 2017 Elsevier B.V. All rights reserved.
机译：由于存在高钾和钠浓度，通过离子色谱法通过离子色谱法直接测定高盐度水样中的铵和胺是不可能的。该工作描述了通过离子色谱法测定高盐度水中铵，单甲胺和单乙胺的简单和快速方法。使用超声波辅助的吹扫和捕集萃取系统来消除基质干扰。该系统使用完整的两级阶乘（23）设计进行了优化，然后是两级阶乘（22）设计。在第一因子设计中，测试了萃取时间，氢氧化钠溶液和分析物质量的浓度。在第二因子设计中，每个分析物的质量保持恒定。在不同矩阵中制备的分析曲线的参数：比较水和盐水溶液中制备的工作标准溶液的硫酸溶液和提取物。发现了0.02,0.03和0.03mg L-1的检测限分别用于铵，单甲胺和单乙胺。分析了从巴西石油工业中预处理以除去氮化合物的盐水。为所有尖刺样品获得令人满意的回收率（93-111％）分析物。精度为<= 10％（n = 3）。该方法是足以分析含有钠，单甲胺和单乙胺浓度的盐水，单甲胺和单乙胺浓度最高的盐水水，单甲胺，单甲胺和单乙胺浓度比高达24,000：1的钾。 （c）2017 Elsevier B.v.保留所有权利。

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