微乳液增敏罗丹明B氧化褪色光度法测定微量亚硝酸根  

Spectrophotometric Determination of Trace Nitrite by OxidationDecoloration of Rhodan B with Sensitizing Effect of Micro-emulsion

作　　者：张莹琪[1] 郭秤德 田丹丹[1] 李晓[1] 

机构地区：[1]太原工业学院化学与化工系,山西太原030008

出　　处：《化工环保》2014年第6期595-598,共4页Environmental Protection of Chemical Industry

摘　　要：基于微乳液对亚硝酸根催化溴酸钾氧化罗丹明B褪色反应具有增敏作用的原理,建立了催化动力学光度法测定痕量亚硝酸根的新方法.实验结果表明：该方法的最佳反应条件为1×10^-4 mol/L的罗丹明B溶液加入量0.60 mL,1 mol/L的稀磷酸加入量1.50 mL,0.1 mol/mL的溴酸钾溶液0.50 mL,反应温度20℃,反应时间15 min;对亚硝酸根测定的线性范围为ρ（NO2-）=0.048-0.800 μg/mL,检出限为0.003 0 μg/mL;加入微乳液后催化反应的灵敏度增大了3倍.A new kinetic spectrophotometric method for determination of trace nitrite has been developed. It is based on the catalytic effect of nitrite on oxidation reaction of rhodamine B by potassium bromate with sensitization effect of microemulsion. The optimum reaction conditions are as follows： rhodamine B solution （1 × 10^-4 tool/L） dosage 0.60 mL, H3PO4 （1 mol/L） dosage 1.50 mL, KBrO3 solution （0.1 mol/ mL） dosage 0.50 mL, reaction temperature 20℃ and reaction time 15 min. The linear range for trace nitrite determination is p （NO2^-）= 0.048-0.800 μg/mL, the detection limit is 0.003 0 μg/mL. The sensitivity of the reaction is increased by 3 times in the presence of micro-emulsion.

关 键 词：亚硝酸根 微乳液 增敏作用 罗丹明B 溴酸钾 动力学光度法 

分 类 号：X832[环境科学与工程—环境工程]