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首页> 外文期刊>Environmental earth sciences >Assessment of the degree of external corrosion of buried water pipelines and source identification of heavy metals due to surrounding soil conditions in humid environment
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Assessment of the degree of external corrosion of buried water pipelines and source identification of heavy metals due to surrounding soil conditions in humid environment

机译：评估地下水管道的外部腐蚀程度，以及潮湿环境中周围土壤条件对重金属的来源识别

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Water distribution pipelines installed underground has possible risks of pipe failure due to corrosion as it ages while urban soils have been noted to have highly elevated concentration of heavy metals due to various human activities. The study aimed to assess the degree of external corrosion of distribution pipe networks and identify probable sources of heavy metals in the surrounding aggressive soil environments. Soil samples were collected with the aid of soil auger at a depth of about 1.0 m while the analyzed soil properties and metals content were done using the standard procedures in the laboratory. The soil quality properties of interest are: soil pH, moisture content, soil temperature, soil resistivity, porosity, oxidation-reduction potential (ORP), chloride ions, sulphate ions, total carbon (TC), total nitrogen (TN), and microbial counts with heavy metals of Cu, Fe, Zn and Mn. Principal component analysis (PCA) was used to identify major soil quality indicators affecting soil corrosivity while multivariate analysis of variance (MANOVA) and cluster analysis (CA) were used to evaluate the spatial variability among the sampling locations, interrelationship between variables and source of heavy metals in soils, respectively. A total consideration of all the analyzed variables on the degree of external corrosion on buried pipelines indicates severely corrosive to mildly corrosive state. PCA identified chemical, moisture content, microbial influenced corrosion (MIC), and heavy metal as four principal factors accounting for 89.4% of total variation in soil quality properties. The results of multivariate statistical analyses identified two sources of metals as from soil parent materials and anthropogenic activities while MANOVA showed that the physio-chemical properties varied significantly different at among the sampling locations.
机译：随着地下管线的老化，安装在地下的配水管线可能会因腐蚀而导致管道故障的风险，而人们注意到，由于各种人类活动，城市土壤中的重金属浓度很高。该研究旨在评估配电管网络的外部腐蚀程度，并确定周围侵蚀性土壤环境中重金属的可能来源。借助土壤钻在约1.0 m的深度处收集土壤样品，同时使用实验室中的标准程序进行分析的土壤性质和金属含量。感兴趣的土壤质量特性是：土壤pH，水分，土壤温度，土壤电阻率，孔隙率，氧化还原电位（ORP），氯离子，硫酸根离子，总碳（TC），总氮（TN）和微生物重金属包括铜，铁，锌和锰。主成分分析（PCA）用于确定影响土壤腐蚀性的主要土壤质量指标，而多元方差分析（MANOVA）和聚类分析（CA）用于评估采样位置之间的空间变异性，变量与重源之间的相互关系土壤中的金属。对埋入管道的外部腐蚀程度进行所有分析变量的综合考虑，表明从严重腐蚀到中等腐蚀状态。 PCA将化学，水分含量，微生物影响的腐蚀（MIC）和重金属确定为四个主要因素，占土壤质量特性总变化的89.4％。多元统计分析的结果确定了两种土壤来源的金属，分别来自土壤母质和人为活动，而MANOVA表明，在各个采样地点之间，理化性质差异显着。

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