摘要
提出了石墨炉原子吸收光谱法测定土壤中有效态镉含量的方法。样品用DTPA提取液于（25±2）℃超声提取15min，选择灰化温度和原子化温度分别为500℃和1800℃。在优化的试验条件下，镉的质量浓度在0．05～3．0μg·L-1 范围内与吸光度呈线性关系，方法的检出限（3s／k）为0．5Pg。方法用于土壤标准物质（GBW07459和GBW07461）中镉含量的测定，测定值与标准方法（GB／T23739-2009）测定值相符，相对标准偏差（n=5）分别为5．2％和2．6％。
A method for the determination of available cadmium in soil by GF-AAS was proposed in this paper. The samples were extracted ultrasonically at （25± 2） ℃ for 15 rain with DTPA extracting solution. The temperatures of ashing and atomization were set at 500℃ and 1 800 ℃ respectively. Under the optimal experimental conditions, linear relationship between values of absorbance and mass concentration of cadmium was kept in the range of 0. 05-3. μg . L -1, with detection limit （3s/k） of 0. 5 pg. The proposed method was applied to the determination of cadmium in two CRM＇s （GBW 07459 and GBW 07461）, giving results in consistency with those obtained by the GB method （GB/T 23739-2009） with values of RSD＇s （n-5） of 5.2% and 2.6% respectively.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第11期1315-1317,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
广西科学研究与技术开发计划项目(桂科攻1123001-9B)
