Occurrence characteristics and risk assessments of nitro polycyclic aromatic hydrocarbons in farmland soil-plant system
This study investigate the occurrence and health risks of nitro polycyclic aromatic hydrocarbons (NPAHs)in different soil-plant systems by collecting soil and plant samples from common farmland,roadside farmland,and farmland inside and outside the greenhouses.The levels of four NPAHs were analyzed by GC-MS.The results showed that the NPAH concentrations in soils and plants from roadside farmland were significantly higher than those from common farmland (p<0.01 ),with 1-nitropyrene (1-NPyr),primarily originating from traffic source,identified as the characteristic compound.The NPAH levels in soils and plants outside the greenhouses were higher than those inside (p<0.05),and levels of 1-NPyr inside and outside greenhouses were significantly different (p<0.05).The bioconcentration factors (BCF) for NPAHs in plants were greater than one,indicating that NPAHs from soil accumulate in plant tissues.The toxic mass fraction TEQ and incremental lifetime cancer risk ILCR for 1-NPyr in soils from roadside farmland were higher than those from common farmland,while the TEQ and ILCR of 1-NPyr in soils outside the greenhouses were higher than those inside.The TEQ and ILCR of 1-NPyr in soils across all farmland environments remained within safe levels.
nitro polycyclic aromatic hydrocarbonsfarmland soilplantsincremental lifetime cancer risk
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