摘要
在稀H2SO4介质中,钼(Ⅵ)对硫酸联氨还原乙基橙的反应有强烈的催化作用.而在0.03mol/LH2SO4-0.30mol/LNH3支持电解质中,乙基橙产生一灵敏的极谱吸附波,峰电位为-0.52V,以此作为监测催化反应过程中乙基橙浓度的变化,建立了催化动力学极谱法测定痕量钼的新体系,方法线性范围为20-300ng/mL,检出限为3.54ng/mL.方法应用于尿中钼的测定。
This method is based on the catalytic effect of Mo(Ⅵ) on the redox reaction between ethyl orange and hydrazine sulfate in sulphuric acid medium at 100℃, and in 0.03mol/L H 2SO 4-0.30mol/L NH 3 H 2O supporting electrolyte, ethyl orange exhibits a sensitive polarographic wave at -0.52V (Vs.SCE). The change in ethyl oragne concentration is traced by polarography. The detection limit and the linear range of Mo(Ⅵ) are 3.54ng/mL and 20 ̄200ng/mL respectively. This new catalytic method has been applied to determining molybdenum in urine, with satisfactory results.
出处
《分析科学学报》
CAS
CSCD
1996年第4期317-319,共3页
Journal of Analytical Science
关键词
钼
催化反应
乙基橙
极谱法
痕量分析
Molybdenum, Catalytic, Ethyl orange , Polarographic method