Simulation Study on Risk and Influencing Factors of Cadmium Loss in Contaminated Soil

Abstract

Cadmium (Cd) in contaminated soil not only enters surface water via rainfall runoff but also penetrates groundwater, adversely affecting human health through the food chain. This research examined three kinds of soil from Luoping County in southwestern China, with different Cd pollution levels. Simulated rainfall and soil column leaching experiments were conducted to explore the risks and factors influencing Cd loss in surface runoff and underground leaching water at different ground slopes (6°, 12°, 18°, and 24°), rainfall intensities (30, 60, and 90 mm∙h−1), and soil profile conditions. The results show that the risk of soil Cd runoff loss increased at a higher rainfall intensity or Cd pollution degree, reaching a peak at a ground slope of 18°. The main factor affecting soil Cd runoff loss was rainfall intensity followed by Cd soil pollution degree and slope. The risk of soil Cd leaching loss was mainly determined by the leaching time and soil depth. The primary factor affecting soil Cd leaching loss was leaching time, followed by soil depth. The soil organic matter (SOM) concentration and pH minimally affected soil Cd loss. The research results provide a theoretical basis for risk management and control of cadmium loss in contaminated soil, and indicate that the environment-friendly water treatment method of high concentration Cd polluted runoff deserves attention.

Effects of different water‐soluble phosphorus on the distribution and utilization of phosphorus in maize in Xinjiang, China

“…The amount of an element in soil that can be directly absorbed and used by crops (i.e., the effective amount) is a better indicator of plant nutrient supply than the total amount of that element. It is an important indicator of the soil nutrient capacity and intensity (Jiang et al, 2023).…”

Effects of woodland slope on heavy metal migration via surface runoff, interflow, and sediments and associated potential ecological risks following the application of sewage sludge

“…Estimates of the magnitude of the potential ecological risks of HM migration via runoff might vary depending on the methodology of rainfall experiments. The effects of slope on the migration of HMs in runoff have generally been estimated via simulated rainfall experiments or natural rainfall experiments in the eld [30][31] . However, whether, and to what extent, the risks of HM migration via runoff and sediment estimated using these two experimental approaches varies remains unclear.…”

Effects of woodland slope on heavy metal migration via surface runoff, interflow, and sediments in sewage sludge application

“…Estimates of the magnitude of the potential ecological risks of HM migration via runoff might vary depending on the methodology of rainfall experiments. The effects of slope on the migration of HMs in runoff have generally been estimated via simulated rainfall experiments or natural rainfall experiments in the field 30 , 31 . However, whether, and to what extent, the risks of HM migration via runoff and sediment estimated using these two experimental approaches varies remains unclear.…”