Abstract
In order to understand the characteristics of heavy metal pollution in shallow groundwater in farmland in Huaibei Plain, 69 samples were collected from typical farmland areas in Xiaoxian County to determine the content of heavy metal elements such as Cr, Zn, Cu, Cd, and Ni. The single-factor pollution index method and Nemerow comprehensive index method are used to evaluate and analyze the pollution degree and the health risk assessment method is used to explore the health risk level. The results show that the concentrations of Cr, Zn, Cu, Cd and Ni were respectively 1.27μg∙L-1~268.78μg∙L-1, 0.45μg∙L-1~ 266.1μg∙L-1, 1.77μg∙L-1~ 29.8μg∙L-1, 0.10μg∙L-1~ 21.54μg∙L-1 and 0.9μg∙L-1~ 252.85μg∙L-1. The Nemerow comprehensive index of each heavy metal element is 0.031~5.507, and the pollution degree is Ni>Cr>Cd>Zn>Cu. The Nemerow comprehensive pollution index of each sampling point is 0.251~9.325, with an average value of 1.934. The overall value is 9.523, and the pollution level is extremely poor. The overall health risk is at a risk-free health level. There are 19 samples which the carcinogenic risk index of the Cr is greater than 10-4, and the number of samples with health risks accounts for 27.5%. Cr is the main source of heavy metal health risks in shallow groundwater in farmland.
Highlights
Groundwater is an important source of water for human life, as well as an important source of water for agricultural production
Heavy metal pollution in shallow groundwater of farmland is a representative research direction of heavy metal pollution in groundwater, which mainly comes from the accumulation of chemical fertilizers, farm manure and pesticides used in farming and planting in the soil[4], which can be used in the food chain
This study focuses on the heavy metal pollution of shallow groundwater in farmland in the Huaibei Plain, and evaluates the degree of heavy metal pollution and health risks, which can provide technical support for the current status of regional water environmental quality
Summary
Groundwater is an important source of water for human life, as well as an important source of water for agricultural production. Surface water is threatened by humans, and groundwater is being polluted, especially heavy metal pollution. Due to surface water replenishment, infiltration or leaching, heavy metals in surface water will be brought to shallow groundwater[2]. Once too many heavy metals enter the water body, it will directly or indirectly affect the health of the human body, and even seriously affect the aquatic ecosystem[3]. When the accumulated heavy metal content in the human body exceeds the tolerable level, the normal physiological functions of the human body will be interfered, which will cause varying degrees of harm to the important functional organs of the human body, and may even threaten human life safety. Accumulation in farmland crops leads to excessive heavy metal content in crops and causes
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