【摘要】 [目的]通过检测某水稻种植试验基地生产的稻米中铅、镉、砷的含量,了解其受重金属污染的情况,为进一步研究提供科学依据。[方法]随机抽取试验基地相邻的15丘稻田(每丘约为0.067 hm2)分为5个检测组(A、B、C、D、E组,每组约为0.2 hm2地),A组为清水种植,其他四组处理相同。从每亩地的稻谷中随机采集2份样品,共30份进行测量,并依照GB2762-2005食品中污染物限量标准及铅、镉、砷三种重金属总体污染评分(OPS)进行评估,OPS分为无污染(OPS≤3)、轻微污染(3<OPS≤6)、中等偏高污染(6<OPS≤30)和严重污染(OPS>30)四级。[结果]30份样品中铅、镉、砷含量平均值分别为(0.62±0.47),(0.45±0.09)和(0.29±0.16)mg/kg;超标率分别为83.3%、100%和36.7%。各组间铅(χ2=4.228)、砷(χ2=3.568)含量差异无统计学意义(P>0.05);镉含量差异有统计学意义(F=3.160;P<0.05);OPS值在5到7之间,铅在OPS中所占比重最大。[结论]该试验基地稻米存在Pb、Cd、As含量超标的情况;OPS结果提示该基地稻米重金属污染处于轻微至中等偏高水平,铅是引起稻米重金属污染的主要因素;全部样品中的镉含量均超标。针对以上情况,建议有关部门加强监测,同时进一步探究引起稻米污染的原因。更多还原

【Abstract】 [Objective] Detecting the concentration of metals(lead, cadmium and arsenic) in the rice from one test field was to provide a snapshot of the current status of metal contamination in rice, coming up with a scientific basis for further research. [Method] The research divided 15 adjacent fields into five groups. Two samples were randomly selected from each field. Metal contamination was evaluated based on GB standards and the overall pollution score(OPS). [Result] The percentages of samples with above-standard levels of the three metals are 83.3%, 100%and 36.7%, respectively. The values of OPSs are ranged from five to seven, with Pb’s pollution index constituting the most percentage between three metals in OPS.[Conclusion] A metal contamination in the grown rice of this test field is observed, in which Pb may be the most important factor, and Cd contents in all of the samples exceed the safety value.更多还原