Pillay Veni, Jonnalagadda Sreekanth B
School of Chemistry, University of KwaZulu-Natal, Durban, South Africa.
J Environ Sci Health B. 2007 May;42(4):423-8. doi: 10.1080/03601230701316416.
The total concentration of toxic elements (aluminum, cadmium, chromium and lead) and selected macro and micro elements (iron, manganese, copper and zinc) are reported in six leafy edible vegetation species, namely lettuce, spinach, cabbage, chards and green and red types of Amaranth herbs. Although spinach and chards had greater than 125 mv of iron, both the amaranthus herbs recorded > than 320 microg g(-1) dry weight. In both the spinach and chard species, the Mn and Zn levels were appreciable recording > 225 microg g(-1) and 150 microg g(-1) dry weight, respectively. Aluminum concentrations were (in microg g(-1) dry weight) lettuce (10), cabbage (11), spinach (167), chards (65), amaranthus green (293) and amaranthus red (233). All the micro and macro elements and the toxic elements (Ni, Cr, Cd and Pb) elements analyzed, were below the recommended maximum permitted levels (RMI) in vegetables. Further the elemental uptake and distribution of the nine elements, at three growth stages of the lettuce plant grown on soil bed under controlled conditions are detailed. In the soil, except for iron (16%), greater than 33% of the other cations were in exchangeable form. Generally in the lettuce plant, roots retained much of the iron (> 224 microg g(-1)) and aluminum (> 360 microg g(-1)), while leaves had less than 200 microg g(-1) of iron and 165 microg g(-1) of Al. Although the concentrations of elements marginally decreased with growth, the lettuce leaves had significant amounts of Mn (30 microg g(-1)), Zn (50 microg g(-1)) and Cu (3.6 microg g(-1)). Some presence of lead in leaves (2.0 microg g(-1)) was noticed, but all the toxic and other elements analyzed were well below the RMI values for the vegetables.
报告了六种可食用叶菜类植物（即生菜、菠菜、卷心菜、甜菜以及绿色和红色苋菜）中有毒元素（铝、镉、铬和铅）以及选定的常量和微量元素（铁、锰、铜和锌）的总浓度。虽然菠菜和甜菜的铁含量高于125毫克/千克，但两种苋菜的铁含量均超过320微克/克干重。在菠菜和甜菜品种中，锰和锌的含量分别可观，分别记录为>225微克/克干重和150微克/克干重。铝的浓度（以微克/克干重计）分别为：生菜（10）、卷心菜（11）、菠菜（167）、甜菜（65）、绿色苋菜（293）和红色苋菜（233）。分析的所有微量和常量元素以及有毒元素（镍、铬、镉和铅）均低于蔬菜推荐的最大允许水平（RMI）。此外，还详细介绍了在受控条件下种植在土壤床上的生菜植株三个生长阶段中这九种元素的元素吸收和分布情况。在土壤中，除了铁（16%）外，其他阳离子中超过33%呈可交换形式。一般来说，在生菜植株中，根部保留了大部分的铁（>224微克/克）和铝（>360微克/克），而叶片中的铁含量低于200微克/克，铝含量低于165微克/克。虽然元素浓度随生长略有下降，但生菜叶片中仍含有大量的锰（30微克/克）、锌（50微克/克）和铜（3.6微克/克）。注意到叶片中存在一些铅（2.0微克/克），但分析的所有有毒和其他元素均远低于蔬菜的RMI值。
