Geophysicochemical characterization of soil contaminated with hydrocarbons in the northern of Veracruz

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
U. J Orozco Cuervo, N. V Gallardo Rivas, U Páramo García, R. D Martínez Orozco, O Delgado Rodríguez
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Abstract

Purpose

In this study, a methodology is developed that involves geochemical and geophysical prospecting methods to identify the type and concentration of hydrocarbons, soil and water resistivity-salinity, and the delineation of hydrocarbon migration in the subsurface within an agricultural region in the northern part of the state of Veracruz, Mexico, where a landfill resulting from hydrocarbon exploitation is the contamination source.

Materials and methods

The methodology involves hydrocarbon fractionation by packed open column liquid chromatography (SARA: Saturates, Aromatics, Resins, and Asphaltenes), textural analysis by sieving, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy with Energy Dispersive X-ray Spectroscopy (SEM–EDX), salinity concentration, total petroleum hydrocarbon concentration in water (TPH), water resistivity, and salinity determination using a laboratory geo-electrical method and Electrical Resistivity Tomography (ERT).

Results and discussions

The hydrocarbon exhibited a stable colloidal stability, and the soil composition is of the general type, classified as clay-sandy with high concentrations of iron and strong salinity. The water showed TPH concentrations, and the resistivity and salinity exceeded the permissible limits set by Mexican standards. Electrical Resistivity Tomography delineated both recent and mature contamination.

Conclusions

With this methodology, it was determined that the region exhibits active contamination directly related to the exploration, exploitation, and pipeline leakage of hydrocarbons. The most affected area was the agricultural zone (low-lying area) due to the overflow of contaminated water from the landfill.

Abstract Image

韦拉克鲁斯州北部受碳氢化合物污染土壤的地球物理化学特征描述
目的 在本研究中,开发了一种涉及地球化学和地球物理勘探方法的方法,以确定碳氢化合物的类型和浓度、土壤和水的电阻率-盐度,以及墨西哥韦拉克鲁斯州北部农业区地下碳氢化合物迁移的范围,该农业区的污染源是碳氢化合物开采产生的垃圾填埋场。材料和方法该方法采用填料开柱液相色谱法(SARA:饱和物、芳烃、树脂和沥青质)、筛分质地分析、傅立叶变换红外光谱法(FTIR)、扫描电子显微镜与能量色散 X 射线光谱法(SEM-EDX)、盐度浓度、水中总石油烃浓度(TPH)、水电阻率以及使用实验室地质电学方法和电阻率断层扫描法(ERT)测定盐度。结果与讨论碳氢化合物具有稳定的胶体稳定性,土壤成分属于一般类型,属于含铁量高和盐度高的粘土-砂土。水体中的 TPH 浓度、电阻率和盐度都超过了墨西哥标准规定的允许范围。通过这种方法,可以确定该地区的污染与碳氢化合物的勘探、开采和管道泄漏直接相关。受影响最严重的地区是农业区(低洼地区),原因是垃圾填埋场的污染水溢出。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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