摘要
用示波极谱法测定了焊锡车间空气及其周围大气中的锡。在 p H 2 .5的0 .1mol/ L 氯乙酸介质中 ,Sn( )与焦没食子酸形成的络合物在汞电极上还原可分别在 -0 .2 5 V和 -0 .45 V各产生一峰形良好的还原波。当有四价钒存在时 ,-0 .45 V处的波的峰电流大幅度增大 ,产生一灵敏的催化电流。该催化电流与锡浓度在 1× 10 -8～ 5× 10 -7mol/ L 范围内呈线性关系 ,检测限为 5× 10 -9mol/
s: A method for the determination of Sn in workplace atmosphere and ambient air was established by oscillopolarography. In 0.1mol/L chloroacetate buffer solution (pH 2.5), Sn(Ⅳ) pyrogallol complex produces two well-defined reduction peaks at -0.25V and -0.45V respectively on a mercury drop electrode. When V(Ⅳ) is introduced to the system, the current of the second peak at -0.45V increased dramatically. The relation of peak current and Sn(Ⅳ) concentration is linear in the range of 1×10 -8 ～5×10 -7 mol/L. The detection limit is 5×10 -9 mol/L.
出处
《分析试验室》
CAS
CSCD
2000年第3期71-74,共4页
Chinese Journal of Analysis Laboratory
关键词
示波极谱法
锡
焦没食子酸
车间空气
Oscillopolarography
Tin
Pyrogallol
Workplace atmosphere
