文章摘要
白玉杰,沈根祥,陈小华,郭春霞,钱晓雍,赵晓祥,周忠强.三种蔬菜对镍累积转运规律及食用安全研究[J].农业环境科学学报,2018,37(8):1619-1625.
三种蔬菜对镍累积转运规律及食用安全研究
Accumulation and transport of nickel in three vegetable crops and their edible safety
投稿时间:2017-11-13  
DOI:10.11654/jaes.2017-1565
中文关键词:   食用蔬菜  累积特征  转运规律  食用安全
英文关键词: nickel  edible vegetable  accumulation characteristic  transport rule  food safety
基金项目:上海市科委重大科技攻关项目(17DZ1202003);上海市环保重大科研项目(2016-08)
作者单位E-mail
白玉杰 东华大学环境科学与工程学院, 上海 201020  
沈根祥 上海市环境科学研究院, 上海 200233 shengx@saes.sh.cn 
陈小华 上海市环境科学研究院, 上海 200233  
郭春霞 上海市环境科学研究院, 上海 200233  
钱晓雍 上海市环境科学研究院, 上海 200233  
赵晓祥 东华大学环境科学与工程学院, 上海 201020  
周忠强 华东理工大学资源与环境学院, 上海 200237  
摘要点击次数: 1936
全文下载次数: 2078
中文摘要:
      为了解三种蔬菜(黄瓜、豇豆、青椒)体内镍(Ni)累积转运规律及食用安全,采用盆栽实验研究了不同浓度Ni处理[原土(对照)、200、350、500、650、800 mg·kg-1]对三种蔬菜生物量、体内分配特征及富集规律的影响。结果表明:(1)Ni对三种蔬菜生长的影响因蔬菜品种不同而不同。在试验浓度范围促进黄瓜的生长;低浓度Ni促进青椒和豇豆生长,当土壤中Ni浓度为650 mg·kg-1时青椒和豇豆的生长受到抑制。(2)在所研究土壤Ni浓度条件下三种蔬菜各部位Ni含量分布不同,青椒和豇豆中根 > 茎叶 > 可食部分;黄瓜中茎叶 > 根 > 可食部分。三种蔬菜中Ni由根部向可食部位转运能力豇豆 > 黄瓜 > 青椒;根部向茎叶转运能力黄瓜 > 豇豆 > 青椒。(3)黄瓜、豇豆、青椒可食部分Ni累积量与土壤中Ni投加量呈显著正相关关系(r2分别为0.973、0.984、0.992,P<0.05)。三种蔬菜可食部分Ni含量高于基于美国环境保护署(USEPA)推荐的Ni人体最大允许摄入量所推导的新鲜蔬菜中Ni的安全阈值(成人3.58mg·kg-1,儿童2.83 mg·kg-1)。Ni在豇豆中的富集能力高于黄瓜和青椒,更容易超过食品安全阈值,Ni污染土壤要避免种植豇豆。
英文摘要:
      In the present study, the accumulation characteristics of nickel(Ni)in three kinds of vegetable crops(cucumber, cowpea and green pepper)and their safety for ingestion were investigated. A pot experiment was carried out with six different dosages of Ni(control, 200, 350, 500, 650, and 800 mg·kg-1)to investigate the effects of Ni on the biomass and accumulation of Ni in different parts of the vegetable crops. The results showed that:(1)The effects of Ni on the growth of three vegetable crops differed. The growth of cucumber was promoted by Ni at the concentration range tested. Relatively low concentration of Ni promoted the growth of green pepper and cowpea. Furthermore, the growth of green pepper and cowpea was inhibited when the concentration of Ni in soil was above 650 mg·kg-1.(2)The amount of Ni in different parts of the vegetable crops was different. In green peppers and cowpea, Ni accumulation was in the order of root > stem and leaf > fruit, while, in cucumber, the accumulation was in the order of stem and leaf > root > fruit. The transportation rate of Ni from root to edible parts was in the order of cowpea > cucumber > green pepper, and that from root to stem and leaf was in the order of cucumber> cowpea> green pepper.(3)The accumulation of Ni in the edible parts positively correlated with the amount of Ni in soil(R2 was 0.973, 0.984, and 0.992,respectively, P<0.05). The concentration of Ni in the edible parts was higher than the safety threshold of Ni in fresh vegetables based on the maximum allowable intake of Ni for humans recommended by the United States Environmental Protection Agency(USEPA)(adult 3.58 mg·kg-1; children 2.83 mg·kg-1). The concentration of Ni in cowpea exceeds the food safety threshold with high probability. Therefore planting cowpea in Ni contaminated soils is not recommended.
HTML    查看全文   查看/发表评论  下载PDF阅读器