Fluorometric Determination of Al in Seawater by Flow Injection Analysis with In-Line Preconcentration
Fluorometric Determination of Al in Seawater by Flow Injection Analysis with In-Line Preconcentration
复制标题
在线富集流动注射分析荧光法测定海水中的铝
DOI：
10.1021/ac00094a039
复制
发表时间：
1994
影响因子：
7.4
通讯作者：
C. Measures
中科院分区：
文献类型：
--
作者：
J. Resing;C. Measures
建立了一种高灵敏度的船舶用流动注射分析法（FLA）测定海水中铝的方法。该方法采用在线预浓缩铝到树脂固定的8-羟基喹啉柱上。Al随后用酸化的海水从树脂中洗脱到FLA系统中。洗脱后的Al与硫脲反应形成螯合物，通过其荧光检测。通过加入胶束形成洗涤剂Brij-35，荧光增强了约5倍。该方法检测限为~ 0.15 nM，在2.4 nM处精密度为1.7%。该方法的循环时间约为3分钟，可以很容易地自动化。该方法的速度、易用性和相对不受人工污染的影响，使其成为船上测定海水中铝的理想方法。在海洋学中，正如在许多其他领域一样，对海洋领域的基本认识的进展速度与用于探测系统的分析工具的发展速度密切相关。在化学海洋学中，活性微量元素的分布特别有用，因为它们的停留时间很短，将它们限制在它们的输入区域，使它们成为海洋输入过程的有价值的示踪剂。在这方面，海洋表层水中铝的分布情况特别具有参考价值。尽管铝是地壳中含量第三高的元素（8.2%），但海洋中的铝含量却极低。因此，它的地表水分布可以用来确定大陆来源的沙尘进入海洋的位置和大小。要在大范围内绘制这些分布，需要开发敏感、精确、快速和在研究船上普遍存在的不利条件下可操作的分析方法。我们在这里报告了一种船上确定满足这些条件的人工智能的方法
A highly sensitive method for the shipboard determination of Al in seawater by flow injection analysis (FLA) has been developed. The method employs in-line preconcentration of Al onto a column of resin-immobilized 8-hydroxyquinoline. The Al is subsequently eluted into the FLA system from the resin with acidified seawater. The eluted Al reacts with Iumogallion to form a chelate, which is detected by its fluorescence. The fluorescence is enhanced~ 5-fold by the addition of a micelleforming detergent, Brij-35. The methodhas a detection limit of~ 0.15 nM and a precision of 1.7% at 2.4 nM. The method has a cycle time of~ 3 min and can be readily automated. The speed, ease of use, and relative freedom from contamination artifacts makes this method ideal for shipboard determination of Al in seawater.In oceanography, as in many other fields, the rate at which the fundamental understanding of the field advances is closely linked to the rate at which the analytical toolsused to probe the system develop. In chemical oceanography, the distributions of reactive trace elements are particularly useful since their short residence times confine them to their input regions, making them valuable tracers of oceanic input processes. The distribution of Al in the surface waters of the oceans is particularly informative in this respect. Despite being the third most abundant element in the Earth’s crust (8.2%), oceanic Al concentrations are extremely low. Thus, its surface water distribution can be used to identify the location and magnitude of inputs of continentally derived dusts to the ocean. To mapthese distributions on a large scale requires the development of analyticalmethodology that is sensitive, precise, rapid, and operable under the adverse conditions prevalent on board research vessels. We report here a method for the shipboard determination of Al that meets these