摘要
研究了混合表面活性剂SDS-OP对二甲酚橙(XO)光度法测锌(Ⅱ)的增敏作用。在醋酸-醋酸钠缓冲体系中,锌-二甲酚橙(XO)-SDS-OP络合物呈紫红色,络合物最大吸收波长为580nm,比不加表面活性剂时红移了20nm。摩尔吸光系数达1.15×105L/mol·cm。锌含量在0.0～28.0μg/ml范围内符合比耳定律,线性回归方程为:A=0.295C+0.001。该法用于奶粉中锌含量的测定,结果令人满意。
The sensitizing action of mixed surfactants（SDS-OP） in the ingrain reaction of zinc and xylenol orange development was studied. With mixed surfactants SDS and OP, in a pH 5.4-6.0 buffer solution, the reaction formed a steady purplish red complex compound. The absorption maxima lied at 580 nm with its apparent molar absorptivity of 1.15 ×105L/mol·cm. Beer＇s law was obeyed in the range of 0.0-28.0μ g/ml for zinc（ Ⅱ ）. Equation was： A = 0.295C＋0.001.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2005年第12期193-195,共3页
Food Science
