硫脲介质-火焰原子吸收光谱法连续测定多金属矿石中的银镉

传统火焰原子吸收光谱法测定Ag、Cd,样品需单独处理,耗时且成本高。建立了火焰原子吸收光谱法连续测定多金属矿石中银、镉的方法,样品经盐酸、硝酸(氟化氢铵)分解,盐酸提取可溶性盐,在硫脲介质中火焰原子吸收光谱仪连续测定Ag、Cd。方法检出限分别为Ag 0.005 4μg/m L、Cd 0.003 2μg/m L,Ag、Cd测定结果的相对标准偏差分别为0.7%~2.8%、0.4%~2.4%,加入标准物质回收率分别为97.5%~103.6%、96.4%~104.0%。该方法酸的用量少,环境污染程度低,准确度和精密度良好。

Synthesis and X-ray Structural Studies of 2-(2-Benzofuroylimino)-3-aryl-4-phenyl-1,3-thiazolines

The synthesis for acyliminothiazolines by treatment of N, N□-substituted thioureas with α-bromoacetophenone under aqueous media was described. 2-（2-Benzofuroylimino）-3-aryl- 4-phenyl-1,3- thiazolines were characterized by infrared, NMR spectroscopy and elemental analysis. The single crystals of compounds 4a and 4b were grown by slow evaporation of 80% ethanol solution at room temperature. Compounds 4a and 4b crystallize in triclinic space group P1 and monoclinic space group P21/c, respectively.