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1 引言钼的测定常用催化极谱法和硫氰酸盐比色法.基于Na_2CO_3-NaHCO_3介质中,痕量Mo(Ⅵ)对过氧化氢氧化偶氮胭脂红B的褪色反应的强烈催化作用所建立的催化光度新方法用于豆中痕量钼的测定,获得满意结果.2 实验部分2.1 主要仪器和试剂 722型分光光度计(上海第三分析仪器厂).钼标准溶液用钼酸铵配制,Mo(Ⅵ)工作浓浓度为0.1mg/L;Na_2CO_3-NaHCO_3缓冲溶液:0.5mol/L;偶氮胭脂红B:5×10~(-4)mol/L;过氧化氢:15%.所用试剂均为分析纯,实验用水为二次亚沸高纯水.
1 Introduction Determination of molybdenum commonly used catalytic polarography and thiocyanate colorimetric method based on the Na_2CO_3-NaHCO_3 medium, the trace amount of Mo (Ⅵ) on hydrogen peroxide oxidation of carmine B fading reaction strongly catalyzed The new catalytic spectrophotometry was established for the determination of trace amounts of molybdenum in beans to obtain satisfactory results.2 Experimental 2.1 Major Equipment and Reagents 722 Spectrophotometer (Shanghai No.3 Analytical Instrument Factory) The molybdenum standard solution was formulated with ammonium molybdate , Mo (Ⅵ) working concentration of 0.1mg / L; NaCO 3-NaHCO 3 buffer solution: 0.5mol / L; azocarmine B: 5 × 10 -4 mol / L; hydrogen peroxide: 15%. The reagents used are of analytical grade, the experimental water for the second sub-boiling high-purity water.