Seasonal distribution of polycyclic aromatic hydrocarbons in the soil of tea plantations in Chibi County
Soil is one of the main places for accumulation of persistent organic pollutants,such as polycyclic aromatic hydrocarbons(PAHs).PAHs concentration,sources and risk assessment in urban,agricultural and industrial soils have received extensive attention.Seasonal differences in the distribution,sources,and ecological risk assessment of PAHs in the soil of the tea plantations in Taipingkou Village,Chibi County were analyzed using gas chromatography-mass spectrometry.The findings showed that the total concentration of 16 PAHs in the soil of tea plantations was in the range of 18.38～154.44 ng·g-1,with an average of 71.33 ng·g-1;the PAH concentration was slightly higher in summer than in winter.Overall,five or six ring PAHs were predominant in tea plantation soil,but in winter,25%of sampling points were dominated by 2-3 ring PAHs.Source analysis revealed that PAHs in the tea plantation soil in Chibi County mainly came from petroleum combustion,mixed combustion sources such as wood and coal.Additionally,in winter,there was also a petroleum input source for PAHs in the soil.There was a significant correlation between total organic carbon(TOC)and total PAHs in the tea plantation soil(r2=0.46,p≤0.05),with a significant correlation between high-ring PAHs(r2=0.5,p≤0.01),and no correlation with low-ring PAHs(r2=0.13,p≥0.05).The ecological risk assessment results indicate that although the overall ecological risk of PAHs in the soil of tea plantations in Chibi County is relatively low,there is still a certain carcinogenic risk,with benzo(b)fluoranthene(BbF),dibenzo(a,h)anthracene(DahA),and indeno(1,2,3-cd)pyrene(InP)contributing the most to the toxicity-equivalence concentrations.
国家科技期刊平台
NSTL
万方数据
维普
