Zeng Jingjing, Li Yi, Zhang Ying, Dai Shouhui, Wang Junfeng, Zeng Wei, Lei Jinting, Zhang Li, Lu Zhe, Sun Yuxin, Luo Xiaojun, Mai Bixian
Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Environmental Theoretical Chemistry, School of Environment, South China Normal University, Guangzhou, 510006, China; South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
Eco-Environmental Monitoring and Research Center, Pearl River Valley and South China Sea Ecology and Environment Administration, Ministry of Ecology and Environment, Guangzhou, 510611, China.
Environ Pollut. 2025 Sep 15;381:126572. doi: 10.1016/j.envpol.2025.126572. Epub 2025 May 30.
p-Phenylenediamines (PPDs) and their quinones (PPDQs) are contaminants of emerging concern. Nevertheless, scarce information exists on their bioaccumulation and biomagnification in food web. Moreover, chiral signatures of 6PPD and its quinone (6PPDQ) have not been studied in the field. Herein, the distribution, bioaccumulation, trophodynamics and enantiomeric compositions of PPDs and PPDQs were explored in the Qi'ao Island mangrove wetland of China. Concentrations of ΣPPDs and ΣPPDQs in mangrove biota ranged from not detected (nd)-352 and nd-49.4 ng/g lipid weight. Mangrove terrestrial birds had higher concentrations of ΣPPDs than aquatic biota. The enantiomeric compositions of 6PPD and 6PPDQ were assessed in the field for the first time. A notable enrichment of (+)-6PPD was detected in crab and fish, while a preferential accumulation of (-)-6PPD was seen in birds. Nonracemic signatures were also found for 6PPDQ in mangrove biota, with the preference accumulation of (+)-6PPDQ. IPPD, DPPD, DTPD and DPPDQ presented significant trophic magnification in the mangrove food web, while no clear trophodynamics trend was found for other target PPDs and PPDQs. Further investigation is necessary to explore the factors affecting the trophodynamics of PPDs and PPDQs and the mechanisms underlying the enantioselective bioaccumulation of 6PPD and 6PPDQ.
对苯二胺（PPDs）及其醌类（PPDQs）是新出现的受关注污染物。然而，关于它们在食物网中的生物累积和生物放大作用的信息却很少。此外，6PPD及其醌类（6PPDQ）的手性特征尚未在野外进行研究。在此，对中国淇澳岛红树林湿地中PPDs和PPDQs的分布、生物累积、营养动力学和对映体组成进行了探索。红树林生物群中ΣPPDs和ΣPPDQs的浓度范围为未检出（nd）至352 ng/g脂重以及nd至49.4 ng/g脂重。红树林陆生鸟类体内的ΣPPDs浓度高于水生生物。首次在野外评估了6PPD和6PPDQ的对映体组成。在螃蟹和鱼类中检测到（+）-6PPD有显著富集，而在鸟类中则观察到（-）-6PPD的优先积累。在红树林生物群中也发现了6PPDQ的非外消旋特征，（+）-6PPDQ优先积累。IPPD、DPPD、DTPD和DPPDQ在红树林食物网中呈现出显著的营养放大作用，而其他目标PPDs和PPDQs未发现明显的营养动力学趋势。有必要进一步研究影响PPDs和PPDQs营养动力学的因素以及6PPD和6PPDQ对映选择性生物累积的潜在机制。
