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目的了解某铬污染区蔬菜铬污染状况。方法利用石墨炉—原子吸收仪对该污染区20个蔬菜品种204个样品的可食部分中重金属铬进行定量检测。结果监测的20种蔬菜都存在不同程度的超标现象,均高于国家标准(0.5mg/kg)。其中铬含量排名前五位的蔬菜依次为玉米(4.471 mg/kg),土豆(4.301 mg/kg)、大白菜(3.524 mg/kg)、大葱(3.688 mg/kg)、油麦菜(3.525 mg/kg);不同类别蔬菜间的铬含量不尽相同,且差异有统计学意义,其中含量最高的为根茎类(3.473±0.750)mg/kg,其次是叶菜类(3.293±0.851)mg/kg,最低的是瓜果类(2.937±0.865)mg/kg。并且裸露地蔬菜中的铬含量(3.430±0.771)mg/kg高于温棚里蔬菜的铬含量(2.853±0.852)mg/kg。结论该污染区蔬菜铬污染状况比较严重,需采取一定的措施进行治理。
Objective To understand the status of chromium pollution in vegetables in a chromium-contaminated area. Methods Quantitative detection of chromium in the edible part of 204 samples from 20 vegetable cultivars in this polluted area was carried out by graphite furnace atomic absorption spectrometry. Results The 20 kinds of vegetables monitored had over-standard phenomena of different degrees, all higher than the national standard (0.5mg / kg). The top five vegetables with the highest chromium content were maize (4.471 mg / kg), potato (4.301 mg / kg), Chinese cabbage (3.524 mg / kg), green onion (3.688 mg / kg). The contents of chromium in different types of vegetables were not the same, and the difference was statistically significant. Among them, the highest contents were rhizome (3.473 ± 0.750) mg / kg, followed by leafy vegetables (3.293 ± 0.851) mg / kg , The lowest is melons (2.937 ± 0.865) mg / kg. (3.430 ± 0.771) mg / kg in bare vegetables were higher than that of vegetables in greenhouse (2.853 ± 0.852) mg / kg. Conclusion The situation of chromium pollution in vegetables in this polluted area is serious, and certain measures need to be taken to control it.