【摘要】 建立了微波消解-电感耦合等离子体质谱(ICP-MS)法测定山东小麦中7种重金属元素(Cr、Ni、Cu、As、Cd、Pb、Zn)的方法,并对山东地区千余份小麦进行分析。结果表明,通过使用适宜的内标和He碰撞模式,7种重金属元素的方法检出限在0.000 7～0.09mg/kg,相对标准偏差(RSD,n=6)在10%以内,标准曲线线性关系良好,相关系数均大于0.999,方法用于国家有证标准物质(GSB-3、GSB-4、GSB24)的测定,结果与标准值相符。方法灵敏度高,重现性好,定量准确,可用于大批量小麦样品的测定。更多还原

【Abstract】 A method for the determination of seven heavy metal elements(Cr,Ni,Cu,As,Cd,Pb,Zn)in Shandong wheat by microwave digestion-inductively coupled plasma mass spectrometry was established.More than1 000 wheats in Shandong province ware analyzed.The results showed that the detection limit is 0.000 7—0.09 mg/kg by using the appropriate internal standard and He collision mode.The relative standard deviation(RSD,n=6)is within 10%.The linear curve of the standard curve is good.The correlation coefficient is greater than 0.999.The method was applied to the determination of national reference samples(GSB-3,GSB-4,GSB24),and the results were consistent with the standard values.The method has high sensitivity,good reproducibility and accurate quantification.It can be used for the determination of large quantities of wheat samples.更多还原