Evangelou Michael W H, Ebel Mathias, Koerner Andrea, Schaeffer Andreas
Institut für Biologie V - Umweltchemie, RWTH Aachen, Worringerweg 1, 52056 Aachen, Germany.
Chemosphere. 2008 Jun;72(4):525-31. doi: 10.1016/j.chemosphere.2008.03.063. Epub 2008 May 16.
Phytoextraction has revealed great potential, however it is limited by the fact that plants need time and nutrient supply and have a limited metal uptake capacity. Although the use of synthetic chelators, such as EDTA, enhances heavy metal extraction, it also produces the negative side effects of high phytotoxicity, as well as leaching of essential metals. The aim of this research was to investigate the application of wool, in mobilising metals and in improving the phytoextraction of metals-contaminated soil. We performed column experiments with 14 d and 7 d partially hydrolysed wool as chelating agent on a silty-loamy sand agricultural soil. In the column experiment the 14 d wool hydrolysate mobilised 68% of Cu in soil, whereas in the case of Cd it mobilised 5.5%. The model plant selected for the phytoextraction experiments was tobacco (Nicotiana tabacum). The plant uptake of Cd and Cu, assisted by the application of 6.6 g kg(-1) wool hydrolysate was increased by 30% in comparison to the control plants. The application of 13.3 g kg(-1) wool hydrolysate enhanced the Cu uptake by up to 850%. Moreover, high leaching probability frequently observed when applying chelating agents, such as EDTA or ethylene diamine disuccinate (EDDS), were not detected. The use of hydrolysed wool therefore merits further investigation.
植物提取已展现出巨大潜力，然而它受到一些因素的限制，即植物需要时间和养分供应，且金属吸收能力有限。尽管使用合成螯合剂（如乙二胺四乙酸）能增强重金属提取，但它也会产生高植物毒性以及必需金属淋失等负面效应。本研究的目的是探究羊毛在活化金属以及改善金属污染土壤的植物提取方面的应用。我们在粉质壤质砂土农业土壤上进行了柱实验，以14天和7天部分水解的羊毛作为螯合剂。在柱实验中，14天的羊毛水解产物使土壤中68%的铜被活化，而对于镉，其活化率为5.5%。用于植物提取实验的模式植物是烟草（Nicotiana tabacum）。与对照植物相比，施加6.6 g kg(-1)羊毛水解产物辅助下，植物对镉和铜的吸收增加了30%。施加13.3 g kg(-1)羊毛水解产物使铜的吸收提高了850%。此外，未检测到在施用乙二胺四乙酸或乙二胺二琥珀酸等螯合剂时经常出现的高淋失概率。因此，水解羊毛的应用值得进一步研究。
