摘要
取粉碎且混匀的样品(0.200 0～0.500 0g)于聚四氟乙烯(PTFE)消化罐中用硝酸6mL及过氧化氢2 mL,按预设程序进行微波消解,所得溶液蒸缩至1 mL左右,加水定容至50mL,供电感耦合等离子体质谱法测定其铝含量。选用钪作为内标元素,外标法定量。铝(Ⅲ)的质量浓度在0.3mg.L-1以内呈线性。方法的检出限(3S/N)为0.061μg.L-1。以实样为基体,在3个浓度水平上加入铝(Ⅲ)标准溶液,按方法测定做回收试验。测得回收率在94.0%～101%之间,测定值的相对标准偏差(n=6)在1.4%～2.1%之间。方法应用于测定大米及小麦标准物质(GBW 10010及GBW 10011)中铝量,测定值与认定值相符。
The powdered and homogenized sample （0. 200 0--0. 500 0 g） was digested with 6 mL of HNO3 and 2 mL of H2O2 in the microwave digestor under pre-set program. The solution obtained was evaporated to ca. 1 mL and made up to 50 mL with water, which was used for ICP-MS determination for its Al-eontent. Scandium was chosen as the internal standard and the method of external standard curve was used for quantification. Linearity range of mass concentration of Al was found within 0.3 mg·L-1. Detection limit （3S/N） of the method found was 0. 061μg·L-1. Recovery of the method was tested by addition of Al（ Ⅲ ） standard solution at 3 concentration levels, giving results of recovery in the range of 94. 0%- 101%, and values of RSD＇s （n=6） in the range of 1.4%--2.1%. Two samples of CRM＇s （GBW 10010 and GBW 10011） were analyzed By the proposed method for their Al-contents, the results obtained were in consistency with the certified values.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2012年第9期1030-1032,1036,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
