The partitioning of atmospheric polycyclic aromatic hydrocarbons (PAHs) into crop systems raises concerns about their potential harm to ecosystem and human health. To assess parent and alkylated PAHs accumulation accurately, the uptake of individual 7-isopropyl-1-methylphenanthrene (Retene), 3-methyl-phenanthrene (3-MP) and phenanthrene (Phe) by living maize, soybean and potato leaf surfaces, as well as the effects of cationic cetyltrimethylammonium bromide (CTMAB) and anionic sodium dodecyl benzene sulfonate (SDBS), were examined in situ using fiber-optic fluorimetry. For each of three PAH chemicals, the uptake achieved equilibrium between the air and living crop leaf surfaces within the 120-h monitoring period. There is inter-chemical and inter-species variability in terms of both the time required reaching equilibrium, the equilibrated adsorption concentration (EAC) and the overall air-surfaces mass transfer coefficient (k_AS). The EAC of the three PAHs for each of the three crops’ leaf surfaces increased with the number of alkyl substitutions on the aromatic ring. For any given PAHs, the EAC values followed the sequence of potato > soybean > maize, which was dominantly controlled by their leaf surface polarity index ((O+N)/C). The presence of CTMAB and SDBS increased the EAC of PAHs in the three crops’ leaf surfaces by 6.5–17.1%, due to the plasticizing effect induced by the surface-sorbed surfactants, and the enhancement degree was closely associated with leaf-wax content and lg K_OW values of PAHs. In addition, the two surfactants promoted the k_AS values of the three chemicals by 7.7–23.3%. These results demonstrated that surfactants promoted the uptake of PAHs onto the crop leaf surfaces, potentially threatening the agricultural product safety.

大气中的多环芳烃（PAH）进入作物系统引起了人们对其对生态系统和人类健康潜在危害的担忧。为了准确评估母体和烷基化 PAH 的积累，活玉米、大豆和马铃薯叶子表面对单个 7-异丙基-1-甲基菲 (Retene)、3-甲基-菲 (3-MP) 和菲 (Phe) 的吸收，如使用光纤荧光测定法原位检查了阳离子十六烷基三甲基溴化铵 (CTMAB) 和阴离子十二烷基苯磺酸钠 (SDBS) 的影响。对于三种 PAH 化学物质中的每一种，在 120 小时的监测期内，空气和农作物叶面的吸收量均达到平衡。在达到平衡所需的时间、平衡吸附浓度 (EAC) 和总体空气表面传质系数 ( k _AS ) 方面，存在化学间和物种间的差异。三种作物叶表面的三种多环芳烃的 EAC 随着芳环上烷基取代的数量而增加。对于任何给定的 PAH，EAC 值的顺序为马铃薯 > 大豆 > 玉米，这主要受其叶表面极性指数 ((O+N)/C) 控制。由于表面吸附表面活性剂的塑化作用，CTMAB和SDBS的存在使三种作物叶面PAHs的EAC增加了6.5-17.1%，增强程度与叶蜡含量和叶蜡含量密切相关。 PAH 的 lg K _OW值。此外，两种表面活性剂将三种化学品的k _AS值提高了 7.7-23.3%。 这些结果表明，表面活性剂促进了作物叶片表面对PAHs的吸收，可能威胁农产品的安全。