多环芳烃在水稻籽粒中的分布及其与环境介质含量的关系
The Distribution of Polycyclic Aromatic Hydrocarbons in Paddy Seeds and the Correlation with the Environmental Media
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摘要: 介绍了江西南昌某郊区采集的成熟期(2008年9月)和收割期(2008年10月)的水稻籽粒中多环芳烃(PAHs)的富集情况,并与同时期的环境介质(土壤、空气气相以及颗粒物)中多环芳烃的含量及分布情况作了相关性分析。结果表明,研究区水稻籽粒中16种多环芳烃(∑PAHs)总量平均为(74.8±13.6) ng/g,水稻土壤中∑PAHs含量平均为(203.7±14.3) ng/g,空气气相样品中∑PAHs含量平均为68.25 ng/m3,以3环和4环多环芳烃为优势化合物;颗粒物样品中∑PAHs含量平均为42.28 ng/m3,以4环、5环和6环多环芳烃为优势化合物。各介质多环芳烃含量在国内同类地区中均位于中等偏下水平。将多环芳烃在水稻籽粒和各个介质之间的生物富集系数与化合物的辛醇分配系数KOC、KOA作对数变换后比较,发现水稻籽粒中多环芳烃的分布与水稻土和空气颗粒物中的多环芳烃没有太大关系;而与空气气相中的多环芳烃关系较明显,证实了前人得到的气相化合物对植物体内化合物的分配起着主要贡献的研究结论。Abstract: Paddy seeds and environment samples such as soil, air and atmospheric particulates were collected and analyzed during the rice maturity and harvest periods (September to October, 2008) from Nanchang Suburb of Jiangxi Province. The results showed that the average concentration of 16 polycyclic aromatic hydrocarbons (∑PAHs) was (74.8±13.6) ng/g in paddy seeds, (203.7±14.3) ng/g in paddy soils, 68.25 ng/m3 in air and dominated by 3 and 4 ring of PAHs, 42.28 ng/m3 in atmospheric particulates and dominated by 4, 5 and 6 ring of PAHs, which indicated that PAHs in various media in this region were at a middle-lower content level compared with in similar media from other regions. The results from correlation analysis of the bio-concentration factors (BCF) of PAHs in paddy seeds and in each environmental medium with the PAHs partition coefficients KOC and KOA indicated that there was no obvious correlation of PAHs distribution in paddy seeds with that in soils and atmospheric particulates, but a clear positive correlation between PAHs in gas phase and in paddy seeds was observed. The results seem to prove that organic pollutants in gas phase are the primary contribution to the pollutant in plant seeds as the previous research conclusions.
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Keywords:
- polycyclic /
- aromatic /
- hydrocarbons /
- (PAHs)
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