Effects of Plants for Reduction and Removal of Hexavalent Chromium from a Contaminated Soil
Effects of Plants for Reduction and Removal of Hexavalent Chromium from a Contaminated Soil
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植物对污染土壤中六价铬的减少和去除效果
DOI：
10.1007/s11270-014-1981-2
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Gikas
中科院分区：
文献类型：
--
作者：
E. Ranieri;P. Gikas
本文研究了三种植物（芦苇、柳和臭椿）在六价铬污染土壤中对灌溉水中六价铬的去除效果。以连续模式用被10 mg/L六价铬污染的水灌溉上述植物物种。六价铬和总铬已被测量在所有植物组织物种和排水。从水中去除的总铬的范围从56%（芦苇）到70%（柳）。经过360天的生长，污染土壤中的铬含量从70（初始）分别下降到32、36和41 mg Cr/kg（干土），其中柳和芦苇的根中积累的铬含量最高（分别为2,029和1,800 mg Cr/kg（干组织）），而臭椿的根中积累的铬含量为358 mg Cr/kg（干组织）。铬在植物组织中主要以三价态存在，在根组织中，臭椿对CrVI还原的亲和力最低，芦苇对CrVI的转运能力最强，而柳树对CrVI的转运能力最强。以根系生长速率抑制表示的毒性效应表明，柳属植物对铬的耐性最强，而臭椿属植物对铬的耐性最弱。
The comparative effectiveness for hexavalent chromium reduction and removal from irrigation water, using three selected plant species (Phragmites australis,Salix viminalis, andAilanthus altissima) planted in soil contaminated with hexavalent chromium, has been studied in the present work. The above plant species were irrigated, in a continuous mode, with water, contaminated with 10 mg/L of hexavalent chromium. Hexavalent chromium and total chromium have been measured in all plant tissues species and in the drainage water. Total chromium removal from water was ranging from 56 % (Phragmites) to 70 % (Salix). After 360 days of growth, the chromium content of the contaminated soil dropped from 70 (initial) to 32, 36, and 41 mg Cr/kg(dry soil), forSalix,Phragmites, andAilanthus, respectively.SalixandPhragmitesaccumulated the highest amount of chromium in the roots (2,029 and 1,800 mg Cr/kg(dry tissue), respectively), compared with 358 mg Cr/kg(dry tissue)forAilanthusroots. Most of chromium was found in trivalent form in all plant tissues.Ailanthushad the lowest affinity for CrVIreduction in the root tissues.Phragmitesindicated the highest chromium translocation potential, from roots to stems, whileSalixindicated the highest chromium translocation from roots to leaves. Toxicity effects, expressed as root growth rate inhibition, indicated thatSalixis the most chromium-tolerant species, withAilanthusin the antipode.