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

灾难性的铁腐蚀有时发生在SRB的存在下，其后果是深远的。基于以下观察，提出了SRB诱导铁腐蚀的理论：在铁腐蚀中，磷酸（PH3）等还原性磷可以催化限速反应，在硫化物存在的情况下，磷酸盐作为缓蚀剂添加到铁金属或饮用水中可以作为催化剂的来源。计划进行三个阶段的实验工作，以研究还原性磷物种化学的各个方面。这包括1)制定分析方案和调查还原态磷的发生情况，2)检查还原态磷的水化学和导致其产生的途径，以及3)确定还原态磷在铁腐蚀中的作用。这项研究虽然是基础性的，但对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一种观点，即在供水系统中存在的条件下，磷的还原可以催化铁的腐蚀。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.