Abstract
Soil-related problems have grown up to be a major threat to human society. Scientific evaluation is helpful to understand the status of soil pollution and provide reference to further work. In this situation, Liaoning Province, a typical industrial and agricultural province in Northeast China, was selected as a case study region. It reviewed 200 studies published between 2010 and 2020 and recorded related data of soil heavy metal. It used model method and index method to evaluate the agricultural region. The comprehensive assessment score of Liaoning pollution level was 0.8998. Dalian was 0.9536, ranking first among the 14 cities. Huludao and Jinzhou were 0.7594 respectively, ranked the last. Heavy metal accumulation in different cities stemmed from different sources, including weathering of parent materials, industrial wastes, sewage irrigation, and mining activities. In general, the pollution level of heavy metal in Liaoning was at low risk level, but it still needs to pay attention to the health risk of heavy metal and the input of heavy metal into the soil, especially cadmium (Cd). This study provides a comprehensive assessment of soil heavy metal pollution in Liaoning, while identifying policy recommendations for pollution mitigation and environmental management.
Highlights
In China, soil in the agricultural regions has been partly contaminated by heavy metal, which lead to the decreasing availability of farmland[3]
Distribution of examined sites. 710 survey points in agricultural regions were distributed in 14 cities of Liaoning province (Fig. 1)
The distribution pattern was consistent with the overall distribution of agricultural regions throughout Liaoning, and these points in the area with large planting regions
Summary
Scientific evaluation is helpful to understand the status of soil pollution and provide reference to further work In this situation, Liaoning Province, a typical industrial and agricultural province in Northeast China, was selected as a case study region. It reviewed 200 studies published between 2010 and 2020 and recorded related data of soil heavy metal It used model method and index method to evaluate the agricultural region. A lot of studies have been conducted on remediation techniques for heavy metal polluted soil, including insitu remediation techniques (surface capping, encapsulation, electrokinetic extraction, soil flushing, chemical immobilization, phytoremediation, bioremediation) and ex-situ remediation techniques (landfilling, soil washing, solidification, vitrification)[9,10] These remediation techniques focus on reducing the maximum or bioavailable concentration of heavy metal in the s oil[11,12]. More scientific, more comprehensive, and more reliable macro-evaluation method is a top priority need
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