Arsenic uptake and speciation in vegetables grown under greenhouse conditions
Arsenic uptake and speciation in vegetables grown under greenhouse conditions
复制标题
DOI：
10.1007/s10653-008-9242-1
复制
发表时间：
2009-04
影响因子：
4.2
通讯作者：
Euan Smith;Euan Smith;A. Juhasz;A. Juhasz;J. Weber;J. Weber
中科院分区：
文献类型：
--
作者：
Euan Smith;Euan Smith;A. Juhasz;A. Juhasz;J. Weber;J. Weber
蔬菜对砷的积累是人类潜在的砷暴露途径之一。蔬菜中As的形态是一个重要的考虑因素，由于不同的As物种的毒性不同。在这项研究中，常见的澳大利亚花园蔬菜水培生长与砷污染的灌溉水，以确定蔬菜组织中存在的吸收和物种。最高浓度的总砷中观察到的所有蔬菜的根和下降的植物的地上部分。蔬菜可食部分的总砷积累量依次为萝卜>绿豆>生菜=甜菜。砷是存在于萝卜，甜菜，生菜的根中的砷酸盐（AsV），并包括77和92%的总砷本，而在绿豆，亚砷酸盐（AsIII）包括90%的总砷本。在地上部分的蔬菜，砷平均分布在AsV和AsIII之间的萝卜和甜菜，但主要是作为AsVin生菜。植物根中As含量升高表明As可能与植物螯合素络合，限制As向植物地上部分的转运。
The accumulation of arsenic (As) by vegetables is a potential human exposure pathway. The speciation of As in vegetables is an important consideration due to the varying toxicity of different As species. In this study, common Australian garden vegetables were hydroponically grown with As-contaminated irrigation water to determine the uptake and species of As present in vegetable tissue. The highest concentrations of total As were observed in the roots of all vegetables and declined in the aerial portions of the plants. Total As accumulation in the edible portions of the vegetables decreased in the order radish ≫ mung bean > lettuce = chard. Arsenic was present in the roots of radish, chard, and lettuce as arsenate (AsV) and comprised between 77 and 92% of the total As present, whereas in mung beans, arsenite (AsIII) comprised 90% of the total As present. In aerial portions of the vegetables, As was distributed equally between both AsVand AsIIIin radish and chard but was present mainly as AsVin lettuce. The presence of elevated As in vegetable roots suggests that As species may be complexed by phytochelatins, which limits As translocation to aerial portions of the plant.