Lee Wen-Yee, Iannucci-Berger William A, Eitzer Brian D, White Jason C, Mattina MaryJane Incorvia
Department of Analytical Chemistry, Experiment Station, New Haven, CT 06511, USA.
Chemosphere. 2003 Oct;53(2):111-21. doi: 10.1016/s0045-6535(03)00353-9.
In order to assess fully the impact of persistent organic pollutants (POPs) on human health, pollutant exchange at the interface between terrestrial plants, in particular food crops, and other environmental compartments must be thoroughly understood. In this regard, transfers of multicomponent and chiral pollutants are particularly informative. In the present study, zucchini (Cucurbita pepo L.) was planted in containerized, uncontaminated soil under both greenhouse and field conditions and exposed to air-borne chlordane contamination at 14.0 and 0.20 ng/m(3) (average, greenhouses), and 2.2 ng/m(3) (average, field). Chiral gas chromatography interfaced to an ion trap mass spectrometer was used to determine the chiral (trans-chlordane, TC, and cis-chlordane, CC) and achiral (trans-nonachlor, TN) chlordane components in vegetation, air, and soil compartments. The chlordane components of interest were detected in all vegetation tissues examined--root, stem, leaves, and fruits. When compared with the data from a soil-to-plant uptake study, the compositional profile of the chlordane components, i.e. the component fractions of TC, CC, and TN, in plant tissues, showed significantly different patterns between the air-to-plant and soil-to-plant pathways. Changes in the enantiomer fractions of TC and CC in plant tissues relative to the source, i.e. air or soil, although observed, were not markedly different between the two routes. This report provides the first comprehensive comparison between two distinct plant uptake routes for POPs and their subsequent translocation within plant tissues.
为了全面评估持久性有机污染物（POPs）对人类健康的影响，必须深入了解陆地植物（特别是粮食作物）与其他环境组分之间界面处的污染物交换情况。在这方面，多组分和手性污染物的转移情况尤其具有参考价值。在本研究中，西葫芦（Cucurbita pepo L.）在温室和田间条件下种植于容器化的未受污染土壤中，并暴露于空气中浓度分别为14.0和0.20 ng/m³（温室平均浓度）以及2.2 ng/m³（田间平均浓度）的氯丹污染物环境中。使用与离子阱质谱仪联用的手性气相色谱法测定植被、空气和土壤组分中的手性（反式氯丹，TC，和顺式氯丹，CC）及非手性（反式九氯，TN）氯丹成分。在所检测的所有植被组织（根、茎、叶和果实）中均检测到了目标氯丹成分。与土壤到植物吸收研究的数据相比，植物组织中氯丹成分的组成概况，即TC、CC和TN的组分分数，在空气到植物和土壤到植物途径之间呈现出显著不同的模式。尽管观察到植物组织中TC和CC对映体分数相对于源（即空气或土壤）的变化，但两条途径之间的差异并不明显。本报告首次对持久性有机污染物两种不同的植物吸收途径及其随后在植物组织内的转运进行了全面比较。
