This study investigated the adsorption of malathion to copper (Cu) and iron surfaces, including microspheres and pipe specimens similar to those in drinking water infrastructure. The solid phase concentration of malathion on the virgin and used Cu pipe specimens was generally between 0.2 and 1 mg/g. The adsorption capacity for Cu and iron microspheres was greater than those of the pipe specimens because of their higher surface‐area‐to‐volume ratios. Copper materials adsorbed more malathion than comparable iron materials. X‐ray photoelectron spectroscopy analysis of Cu and iron surfaces revealed peaks at 164 eV (S 2p) and 135 eV (P 2p), which suggests that malathion chemically bonded to the surfaces of the specimens. Metal oxides likely formed stable bonds with phosphorus through pi conjugation. These findings are the first to show that malathion can chemically adhere to Cu and iron pipe materials. This insight is critical for understanding the decontamination strategies needed for water networks.

中文翻译：

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马拉硫磷在与水基础设施有关的铜和铁表面上的吸附。

这项研究调查了马拉硫磷对铜（Cu）和铁表面的吸附，包括类似于饮用水基础设施中的微球和管道标本。原始和使用过的铜管样品上马拉硫磷的固相浓度通常在0.2和1 mg / g之间。铜和铁微球的吸附容量比管道样品大，因为它们的表面积/体积比更高。铜材料比可比的铁材料吸收的马拉硫磷更多。铜和铁表面的X射线光电子能谱分析显示在164 eV（S 2p）和135 eV（P 2p）处有一个峰，这表明马拉硫磷已化学键合到样品表面。金属氧化物可能通过pi共轭与磷形成稳定的键。这些发现是第一个表明马拉硫磷可以化学粘附在铜和铁管材料上的发现。这种见解对于理解水网络所需的去污策略至关重要。