Reduced Phosphorus in the Environment and Its Role in Anaerobic Iron Corrosion

0201949爱德华兹灾难性的铁腐蚀有时会在硫酸盐还原菌存在的情况下发生，并产生严重的后果。根据磷化氢(PH3)等磷还原物种在铁腐蚀中可以催化限速反应，以及在金属铁或饮用水中添加磷酸盐作为缓蚀剂，在硫化物存在下可以作为催化剂的来源，提出了SRB引起铁腐蚀的理论。这包括1)分析方案的发展和还原磷赋存状态的调查，2)还原磷的水化学和导致其产生的途径的检查，以及3)确定还原磷在铁腐蚀中的作用。这项研究虽然是基础的，但在工程界有重要的应用。研究人员指出，有充分的证据支持这样的观点，即在供水系统中存在的条件下，磷的减少可能会催化铁的腐蚀。因此，在存在这些形式的磷的地方，更换管道的成本可能会很高。

0201949 Edwards Catastrophic iron corrosion sometimes occurs in the presence of SRB with profound consequences. A theory of SRB induced iron corrosion is proposed based on the observations that reduced phosphorus species such as phosphine (PH3) can catalyze the rate limiting reaction in iron corrosion, and that phosphates added to iron metal or drinking water as corrosion inhibitors can serve as the source of catalyst in the presence of sulfides.Three phases of experimental work are planned to examine aspects of reduced phosphorus species chemistry. This includes 1) development of analytical protocols and a survey of reduced P occurrence, 2) examination of the aqueous chemistry of reduced P and pathways leading to its production, and 3) defining the role of reduced phisphorus in iron corrosion.This research, although fundamental, has important applications to the engineering community. The investigators note that there is ample evidence supporting the idea that reduced phosphorus could catalyze iron corrosion under conditions present in water distribution systems. Therefore, where these forms of phosphorus are present, there can be high costs associated with pipe replacement.