|
| Adsorption and leaching behavior of five neonicotinoid pesticides in farmland soil |
| Received:January 12, 2023 |
| View Full Text View/Add Comment Download reader |
| KeyWord:neonicotinoid pesticides|Freundlich equation|adsorption|leaching |
| Author Name | Affiliation | E-mail | | HU Chuanhe | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710000, China | | | LI Yongtao | School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710000, China
School of Resources and Environment, South China Agricultural University, Guangzhou 510000, China | | | SHANG Mengru | School of Resources and Environment, South China Agricultural University, Guangzhou 510000, China | | | CHEN Xinmin | School of Resources and Environment, South China Agricultural University, Guangzhou 510000, China | | | TIAN Zhuoxun | School of Resources and Environment, South China Agricultural University, Guangzhou 510000, China | | | LIN Xueming | School of Resources and Environment, South China Agricultural University, Guangzhou 510000, China | xm.lin@scau.edu.cn |
|
| Hits: 1018 |
| Download times: 732 |
| Abstract: |
| To explore the adsorption and leaching behavior of neonicotinoid pesticides in farmland soil, the adsorption and leaching process of five types of neonicotinoid pesticides such as furosemide in three different types of soil in the National Modern Agriculture Demonstration Zone, Dengtu Basin, Heyuan City, Guangdong Province, were studied from April to August 2022 using the oscillation balance and soil column leaching methods. The results showed that the Kd（soil adsorption coefficient）values of the five neonicotinoid pesticides in the three types of soil varied in the following range：red soil（0.33-0.86 mL·g-1）, paddy soil（1.47-3.21 mL·g-1）, and moisture soil（0.63-1.47 mL·g-1）; the Koc（soil adsorption constant）values varied in the following range：red soil（36.67-95.56 mL·g-1）, paddy soil （81.64-178.37 mL·g-1）, and moisture soil（52.56-122.51 mL·g-1）; ΔG（free energy of soil adsorption）varied in the following range：red soil（-8.76--11.10 kJ·mol-1）, paddy soil（-10.71--12.61 kJ·mol-1）, and moisture soil（-9.64--11.70 kJ·mol-1）. Five neonicotinoid pesticides were difficult to adsorb in the three types of soil, and this process was spontaneous physical adsorption. Soil organic matter content（r=0.7728-0.9963）and clay content（r=0.7345-0.9634）were the most significant soil physical and chemical parameters influencing the adsorption process. The R3+R4（mass percentage of pesticide in 20 cm to 30 cm sections and leaching solution）value of neonicotinoid pesticides in the three types of soils ranged as follows：red soil（73.8%-87.4%）, paddy soil（1.3%-62.3%）, and moisture soil （10.5%-71.8%）. The five types of neonicotinoid pesticides were difficult to adsorb and easy to leach in red soil, but difficult to absorb and leachable in paddy soil and moisture soil. The increase of soil organic matter content significantly inhibited the leaching process. The study shows that the five types of neonicotinoid insecticides are difficult to adsorb and easy to dissolve in red loam, and will penetrate into the soil with rainfall, irrigation and other factors, causing potential pollution of groundwater. |
|
|
|
