极谱催化波法测定红辣椒粉中的苏丹红Ⅰ  

A sensitive polarographic catalytic wave method for determination of Sudan Ⅰ in red chili powder

作　　者：刘伟[1] 陈建波[1] 赵伟军[1] 赵道远[1] 杨明敏[1] 

机构地区：[1]南京农业大学理学院,江苏南京210095

出　　处：《南京农业大学学报》2008年第3期137-139,共3页Journal of Nanjing Agricultural University

摘　　要：在Na2HPO4-KH2PO4缓冲液（pH8．0）中，加入适量的K2S208溶液后，用微分脉冲极谱法测定苏丹红Ⅰ，结果于-0．590V处产生苏丹红Ⅰ的二阶导数峰。其含量在0．01～0．10mg·L^-1范围内呈良好的线性关系，线性回归方程为：Y=0．0552x＋0．2128（r=0．9993，n=5），检出限为2．0μg·kg^-1。该催化波的灵敏度比相应的还原波提高了5倍以上，用于测定辣椒粉中的苏丹红Ⅰ，结果满意。In Na2HPO4-KH2PO4 buffer （pH 8.0） added 5.0 mmol · L^-1K2S2O8 supporting electrolyte.The reduction wave of Sudan Ⅰ at -0. 590 V （Vs, SCE） was catalyzed by K2S2O8. A second order derivative peak current was proportional to Sudan Ⅰ concentration in the range of 0. 01 - 0. 10 mg · L^- 1 （ r = 0. 999 3 ）, and the detection limit is 2. 0 μg · L^ - 1 The sensitivity of the catalytic wave was 5 times higher than that of the corresponding reduction wave. The catalytic polarographic method was applied to determine Sudan Ⅰ in the red chili powder.

关 键 词：苏丹红Ⅰ 过硫酸钾 脉冲极谱 

分 类 号：O657.14[理学—分析化学]