Uptake of arsenic by New Zealand watercress (Lepidium sativum).
Uptake of arsenic by New Zealand watercress (Lepidium sativum).
复制标题
新西兰豆瓣菜（Lepidium sativum）对砷的吸收。
DOI：
10.1016/s0048-9697(02)00294-2
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
A. Saravanan
中科院分区：
文献类型：
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作者：
B. Robinson;C. Duwig;N. Bolan;M. Kannathasan;A. Saravanan
豆瓣菜是一种蔬菜，特别是新西兰的土著社区。早些时候有报道称，在新西兰北岛怀卡托河采集的一些水生大型植物中，砷浓度过高，之后，对豆瓣菜积累砷的情况进行了调查。由于地热活动，新西兰陶波火山带的怀卡托河和其他一些水生系统的砷浓度升高。从怀卡托河沿岸的27个地点采集了豆瓣菜、河水和沉积物样本，并对其进行了砷分析。温室试验是在含有添加砷的烧杯中种植的豆瓣菜，以确认该物种积累砷的能力。在多个地点，食水和豆瓣菜样本的砷含量均超过世界卫生组织(世卫组织)饮用水(0.01mgL−1)和食品(以鲜重计算为2mgkg−1)的限量。以鲜重计算，叶片和茎的平均砷含量分别为29.0和15.9mgkg−1。生长在L−1浓度为0.4 mg的溶液中的植株鲜重砷浓度超过世界卫生组织限值。尽管这些浓度较高，但在温室条件下种植的植物的砷水平大约比在怀卡托河种植的植物低五倍，这可能是因为在自然条件下，豆瓣菜植根于平均含有约35毫克−1砷的沉积物中。建议不要食用来自怀卡托河或其他水砷浓度较高地区的豆瓣菜。
Watercress (Lepidium sativum) is consumed as a vegetable, especially by the indigenous community in New Zealand. An investigation was carried out on the accumulation of arsenic by watercress, following earlier reports of inordinate arsenic concentrations in some aquatic macrophytes collected from the Waikato River, North Island, New Zealand. The Waikato River and some other aquatic systems in Taupo Volcanic Zone, New Zealand have elevated arsenic concentrations due to geothermal activity. Watercress, river water and sediment samples were collected from 27 sites along the Waikato river and analysed for arsenic. Greenhouse trials with watercress grown in beakers containing added arsenic were conducted to confirm the ability of this species to accumulate arsenic. At a number of sites, the concentration of arsenic in both the water and the watercress samples exceeded the World Health Organisation (WHO) limit for drinking water (0.01 mg l−1) and foodstuffs (2 mg kg−1on a fresh weight basis). The average leaf and stem arsenic concentrations were, respectively, 29.0 and 15.9 mg kg−1on a fresh weight basis. Plants grown in solutions of >0.4 mg l−1arsenic concentration had fresh weight arsenic concentrations above the WHO limit. Despite these higher concentrations, arsenic levels in plants grown under greenhouse conditions were approximately fivefold lower than in plants growing in the Waikato River, possibly because under natural conditions, the watercress is rooted in sediment containing on average approximately 35 mg kg−1arsenic. It is recommended that watercress from the Waikato River, or other areas with elevated water arsenic concentrations, should not be consumed.