【摘要】 采用硫化铵分解硫磺试样 ,在 1 .46mol/L H3 PO4 、0 .8mol/L KI和 4.0 7× 1 0 -5mol/L Te( )体系中以催化极谱法测定微量砷。极谱峰电位为 - 0 .63V(相对饱和甘汞电极 )。砷浓度在 4～1 0 0 ng/m L范围内与峰电流有良好的线性关系 ,检出限为 2 ng/m L。方法的 RSD为 3.6%～ 4.6% ,加标回收率为 94%～ 97%。该法操作简便快速 ,用于硫磺样品测定 ,结果满意更多还原

【Abstract】 A new method for the determination of arsenic by catalytic paparography in 1.46 mol/L phosphoric acid,0.8 mol/L potassium iodide and 4.07×10 -5 mol/L telliurium system was described. The peak potential was -0.63 V(vs·SCE). The peak height was linear with the concentration of arsenic in the range of 4~100 ng/mL. The detecfion limit was 2 ng/mL. The RSD was in the range 3.6%~4.6% and the recovery was 94%~97%. This method is simple and rapid, and has been used to determine the trace arsenic in sulphur sample. The samples were dissolved in ammonium sulfide and oxidized to ammonium sulfate by hydrogen peroxied in ammoniacal medium.更多还原