In drinking water, residual chlorine is very likely to coexist with iron particles. However, the understanding of the effect of residual chlorine on iron particle formation in relation to different drinking water conditions is limited. Here, we found a significant competitive relationship between residual chlorine and dissolved oxygen (DO) during iron particle formation. Composition gave a good indicator of the extent of oxidation; with DO being the sole oxidant, the most abundant iron crystal in the particles formed was FeOOH (79.12%) followed by Fe₃O₄ (20.88%); in the presence of residual chlorine, however, the oxidation states of the iron crystals shifted upwards; the composition became as follows: FeOOH (50.64%), Fe₃O₄ (27.96%) and Fe₂O₃ (21.40%). The morphology of the particles formed showed interesting trends. In the presence of residual chlorine, the iron particles became denser and the specific surface area decreased. Particle size also exhibited a positive correlation with the chlorine concentration. The iron particle's specific surface areas formed with and without residual chlorine were 41.11m²/g and 61.30 m²/g, respectively. Linear regression also showed a good linear relationship between concentrations of iron ion and residual chlorine and the turbidity of the resulting water sample. Residual chlorine affects iron particle formation through different aspects, especially so when considering the interaction between residual chlorine with other oxidants and the resulting change in morphology. Runs of solutions with a high chlorine concentration through the pipe network could potentially act as a maintenance treatment.

在饮用水中，余氯极有可能与铁颗粒共存。然而，关于不同饮用水条件下余氯对铁颗粒形成的影响的理解是有限的。在这里，我们发现在铁颗粒形成过程中残留氯和溶解氧 (DO) 之间存在显着的竞争关系。组成是氧化程度的良好指标；DO是唯一的氧化剂，形成的颗粒中含量最高的铁晶体是FeOOH（79.12%），其次是Fe ₃ O ₄（20.88%）；然而，在残留氯的存在下，铁晶体的氧化态向上移动；组成如下：FeOOH (50.64%), Fe ₃ O ₄(27.96%) 和 Fe ₂ O ₃ (21.40%)。形成的颗粒的形态显示出有趣的趋势。在余氯存在的情况下，铁颗粒变得更致密，比表面积减小。粒径也与氯浓度呈正相关。含余氯和不含余氯形成的铁颗粒比表面积分别为41.11m ² /g和61.30 m ²/g，分别。线性回归还显示铁离子和余氯的浓度与所得水样的浊度之间存在良好的线性关系。余氯通过不同方面影响铁颗粒的形成，尤其是在考虑余氯与其他氧化剂之间的相互作用以及由此产生的形态变化时。流经管网的高氯浓度溶液可能起到维护处理的作用。