ABSTRACT Contamination of ground water as a consequence of soil leaching processes is an issue of major concern. In this context, a simulation of the soil leaching process was designed. A sequential injection (SI) method to monitor the soil leaching of iron complexes with in-line rain simulation for leachate production is described. The developed methodology comprises the SI determination of both iron(III) and 3-hydroxy-4-pyridinones iron(III) complexes, coupled to a mini soil column (mSC) for displaying in-line rain simulations. The described SI method enabled iron(III) determination within the range 2.0–35 µmol L−1, with a detection limit of 0.42 µmol L−1, and determination of iron(III) complexes in the range 1.0–45 µmol L−1. It was successfully applied to leachates from laboratory scale soil columns (LSSC), with good precision for both iron(III) and iron complexes determinations: calculated relative standard deviation (RSD) of 5% and 6%, respectively. A step further in automation and miniaturization was attained with the incorporation of a mini soil column for the in-line leachate production. The system enabled the soil leachate production and assessment in less than 5 min, including determinations in triplicate.

中文翻译：

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基于流的集成系统显示在线微型土壤柱以监测土壤渗滤液中的铁种类

摘要 土壤浸出过程造成的地下水污染是一个主要关注的问题。在此背景下，设计了土壤浸出过程的模拟。描述了一种连续注入 (SI) 方法，用于通过在线降雨模拟监测铁配合物的土壤浸出液生产。开发的方法包括铁 (III) 和 3-羟基-4-吡啶酮铁 (III) 配合物的 SI 测定，与微型土柱 (mSC) 耦合以显示在线降雨模拟。所描述的 SI 方法能够测定 2.0–35 µmol L-1 范围内的铁 (III)，检测限为 0.42 µmol L-1，并能测定 1.0–45 µmol L-1 范围内的铁 (III) 配合物. 它已成功应用于实验室规模土柱（LSSC）的渗滤液，铁 (III) 和铁络合物测定均具有良好的精度：计算得出的相对标准偏差 (RSD) 分别为 5% 和 6%。通过引入用于在线渗滤液生产的微型土壤柱，进一步实现了自动化和小型化。该系统能够在不到 5 分钟的时间内完成土壤渗滤液的生产和评估，包括一式三份的测定。