title: The mutual co-regulation of extracellular polymeric substances and iron ions in biocorrosion of cast iron pipes.
abstract: New insights into the biocorrosion process may be gained through understanding of the interaction between extracellular polymeric substances (EPS) and iron. Herein, the effect of iron ions on the formation of biofilms and production of EPS was investigated. Additionally, the impact of EPS on the corrosion of cast iron coupons was explored. The results showed that a moderate concentration of iron ions (0.06 mg/L) promoted both biofilm formation and EPS production. The presence of EPS accelerated corrosion during the initial stage, while inhibited corrosion at the later stage. The functional groups of EPS acted as electron shuttles to enable the binding of iron ions. Binding of iron ions with EPS led to anodic dissolution and promoted corrosion, while corrosion was later inhibited through oxygen reduction and availability of phosphorus from EPS. The presence of EPS also led to changes in crystalline phases of corrosion products.
authors: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China; School of Environment, Tsinghua University, Beijing 100084, China.
authors: Juntao
authors: J
authors: Jin
authors: Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (MARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China. Electronic address: guanyt@tsinghua.edu.cn.
authors: Yuntao
authors: Y
authors: Guan
mesh_terms: D001426:Bacterial Proteins / Q000032:analysis; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development*; D001704:Biopolymers / Q000494:pharmacology*; D003343:Corrosion; D005110:Extracellular Space / Q000737:chemistry*; D007477:Ions; D007501:Iron / Q000494:pharmacology*; D010100:Oxygen / Q000032:analysis; D011135:Polysaccharides, Bacterial / Q000737:chemistry; D013052:Spectrometry, X-Ray Emission; D014881:Water Supply
chemical_list: D001426:Bacterial Proteins; D001704:Biopolymers; D007477:Ions; D011135:Polysaccharides, Bacterial; D007501:Iron; D010100:Oxygen
keywords: Biocorrosion; Biofilm; Cast iron; Extracellular polymeric substances; Iron ion