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.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2008年第3期137-139,共3页
Journal of Nanjing Agricultural University
关键词
苏丹红Ⅰ
过硫酸钾
脉冲极谱
Sudan Ⅰ
potassium persulphate
derivative pulse polarography
