内江市土壤和蔬菜中微量元素的相关性研究

[目的]研究土壤和蔬菜中微量元素的相关性。[方法]采用梅花形布点法采样,用火焰原子吸收分光光度法和石墨炉原子吸收法测定土壤和蔬菜中的Zn、Fe、Cu、Mn、Ca、Mg和Pb含量。[结果]试验地土壤中含有丰富的微量元素,其含量大小依次为:Ca>Fe>Mn>Mg>Zn>Cu,所测蔬菜中微量元素含量大小依次为:Ca>Mg>Fe>Cu。所测蔬菜对土壤中微量元素的吸收具有选择性,所测蔬菜中Mg含量明显高于土壤,Cu含量明显低于土壤,说明蔬菜对Mg有富积作用,对Cu无富积作用。蔬菜不同部位同一元素的含量有很大差别,莴笋叶中微量元素含量都比莴笋茎中高。70%蔬菜中Pb含量均未超过国家标准限量。[结果]土壤中微量元素和蔬菜中微量元素有较好的相关性。

Study on the Relativity of Main Trace Elements in the Soil and Vegetables from Neijiang

[Objective] The aim of the research was to study the correlation between the trace elements in the soil and that in vegetables.[Method] Samples were collected by quincunx sampling method and the contents of Zn,Fe,Cu,Mn,Ca,Mg and Pb in soil and vegetables were determined by flame atomic absorption spectrophotometry and graphite furnace atomic absorption method.[Result] There were abundant trace elements in the soil of the experimental field and the order of the contents was Ca>Fe>Mn>Mg>Zn>Cu.And that in vegetables was Ca>Mg>Fe>Cu.The determined vegetables had the selectivity to the absorption of trace elements in soil.Mg content in the determined vegetables was higher than that in the soil and Cu content was lower than that in the soil,which indicated that vegetables had the accumulation effect on Mg and they had no accumulation on Cu.The content of the same element had greater difference in different parts of vegetables and the contents of trace elements in the leaves of Lactuca sativa L.were all higher than that in the stem.Pb content of 70% vegetables didn't exceeded the limited quantity of national standard.[Conclusion] The trace elements in the soil had better correlation with that in vegetables.