西葫芦对土壤持久性有机氯化物污染的指示性研究

发布时间：2018-08-06 10:43

【摘要】：西葫芦(Cucurbita pepo L.)对土壤中持久性有机氯化物的超强吸收能力已被证实,意味其具有指示区域土壤持久性有机氯化物污染状况的潜能。本研究采用农田小区试验,考察了西葫芦不同组织器官(根、过渡茎、茎、叶和果实)在6个生长期对有机氯化物的累积吸收行为;采用同位素稀释高分辨气相色谱-高分辨质谱法,分析了种植土壤及西葫芦各组织器官中的21种有机氯农药(OCPs)和18种多氯联苯(PCBs)。结果表明,西葫芦可将根吸收的OCPs和PCBs传递到过渡茎和茎。不同生长期采集的西葫芦根、过渡茎和茎中的OCPs和PCBs浓度基本稳定,无明显生物稀释效应,且此3个组织器官中OCPs和PCBs的分布模式与土壤中的分布模式基本一致。因此,可以用西葫芦根和茎中持久性有机氯化物的浓度指示土壤中持久性有机氯化物的污染水平,根和茎的采样时间可以不受西葫芦生长期的限制。
[Abstract]:Zucchini (Cucurbita pepo L.) The superabsorbability of persistent organic chlorides in soils has been proved, which indicates that they have the potential to indicate the persistent organic chlorides contamination in soils. In this study, the accumulative absorption behavior of organic chloride in different tissues and organs (root, transitional stem, leaf and fruit) of zucchini was studied in 6 growing periods. In this paper, 21 organochlorine pesticides (OCPs) and 18 polychlorinated biphenyls (PCBs).) in soil and in tissues and organs of zucchini were analyzed by isotope dilution high resolution gas chromatography-high resolution mass spectrometry. The results showed that zucchini could transfer the OCPs and PCBs absorbed by the root to the transitional stem and stem. The concentrations of OCPs and PCBs in the transitional stems and stems were basically stable, and there was no obvious biological dilution effect. The distribution pattern of OCPs and PCBs in these three tissues and organs was basically consistent with that in soil. Therefore, the concentration of persistent organic chlorides in roots and stems of zucchini can be used to indicate the contamination level of persistent organic chlorides in soil, and the sampling time of roots and stems can not be limited by the growth period of zucchini.
【作者单位】：中国科学院大连化学物理研究所;
【基金】：环保公益性行业科研专项(201309030) 中科院科技服务网络计划(KFJ-EW-STS-099)
【分类号】：X503.231;X592

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