方案摘要
方案下载应用领域 | |
检测样本 | |
检测项目 | |
参考标准 |
A simple method is proposed for copper, lead and manganese determination in deciduous teeth by graphite furnace atomic absorption spectrometry (GFAAS) using slurry sampling introduction and cryogenic sample preparation. Teeth samples were ground in a cryogenic mill in two steps: pre-cooling (5 min) and cryogenic grinding (2 min) in liquid nitrogen. After grinding, 90% of the sample particles were lower than 150 mm. The minimum mass necessary for slurry preparation as an indicator of sub-sample homogeneity was evaluated by weighting masses between 5 and 20 mg directly in autosampler cups, followed by addition of 1 mL of a solution containing 0.04% Triton1 X-100 and 0.2% v/v HNO3. Samples (20 mL) were sonicated during 20 s, before delivering into a W–Rh coated platform. Detection limits based on integrated absorbance were 34.0 ng g21 Pb, 7.4 ng g21 Mn and 18.0 ng g21 Cu for 2% m/v slurries. W–Rh permanent modifier permitted calibration against aqueous standards. The Certified Reference Material (H-5 animal bone) from the International Agency of Atomic Energy (IAEA) was analyzed to determine lead for method validation. For copper, lead and manganese, 12 human teeth samples were analyzed using the proposed method with calibration against aqueous solution and using a comparative Pd/Mg method with the same digested samples, and standard addition calibration, with no statistical difference at 95% level on applying the t-test.
Hot consolidation of Cu–Li powder alloys
相关产品
BioDrop 微量比色皿
BioDrop TOUCH 超微量分光光度计
BioDrop μLITE 超微量分光光度计
BioDrop DUO 多功能超微量分光光度计
高通量动植物组织研磨机
SpectroMill®-TS单研磨罐高能量球磨机
SpectroMill® II双研磨罐高能量球磨机
冷冻研磨系统
HT Mini高能量台式动植物组织研磨机
HT Homogenizer高通量动植物组织研磨机
Talboys 多点磁力搅拌器
Talboys 数显型5000敞开式摇床
Talboys Professional 3500恒温培养摇床
Talboys 数显型旋涡混合器
Talboys 数显型多管式旋涡混合器
关注
拨打电话
留言咨询