枣果中重金属镍来源途径探究

通过对土壤、农药、化肥、农家肥、大气降尘样品中重金属镍的总含量分析,明确典型区域红枣中重金属镍的外源性输入途径。利用电感耦合等离子体质谱仪技术手段分析了样品中的重金属镍含量,结果表明:受试土壤、肥料样品中均含有重金属镍,含量范围分别在17.194～67.279,0.450～26.800mg/kg,镍总含量较高的化肥(农家肥中)类型集中在鸡粪,生物有机肥、氨基酸水溶肥、磷酸盐肥中;同一区域内大气降尘中镍总含量随时间推移呈下降趋势,同一区域内不同乡镇间大气降尘镍含量无显著差异;不同种类农药中镍总含量由高至低依次为:A类、B类、C类、D类;15个枣园土壤镍含量随灌溉水流呈整体上升趋势。综合以上分析,可以得出:土壤、肥料、大气降尘、农药、灌溉水均为红枣中重金属镍的外源输入途径。

Study on the sources of nickel in jujube fruit

Through the analysis of the total content of heavy metal nickel in soil, pesticide, fertilizer, farmyard manure and atmospheric dust samples, the exogenous input pathway of heavy metal nickel in jujube in typical areas was determined. ICP-MS (inductively coupled plasma mass spectrometry) was used to analyze the content of heavy metal nickel in the samples. The results showed that the tested soil and fertilizer samples contained heavy metal nickel in the range of 17.194~67.279 and 0.450~26.800 mg/kg, respectively. The total content of nickel in chicken manure, bioorganic fertilizer, amino acid water-soluble fertilizer and phosphate fertilizer was relatively high. In the same region, the total content of nickel in the atmospheric dust decreased with time, but there was no significant difference among different villages and towns in the same region. The total content of nickel in different kinds of pesticides from high to low was: A, B, C and D. The total content of nickel in 15 jujube garden soil increased with irrigation water flow. Based on the above analysis, it could be concluded that soil, fertilizer, atmospheric dust, pesticide and irrigation water were all exogenous input ways of heavy metal nickel in jujube.