摘要
在表面活性剂溴化十六烷基三甲基铵及酸性三羟甲基氨基甲烷-盐酸缓冲介质存在条件下,铬天青S与Pb(Ⅱ)结合,导致共振瑞利散射(resonance Rayleigh scattering,RRS)显著增强,并产生新的RRS光谱.在最大共振瑞利散射峰369 nm波长处,Pb(Ⅱ)的质量浓度在0.002~0.35 mg/L范围内与体系的共振瑞利散射增强程度(ΔIRRS)呈良好的线性关系,定量限为0.024 mg/kg.据此建立了快速、准确、高灵敏的测定Pb(Ⅱ)的RRS新方法,并研究了适宜的反应条件及RRS光谱特征.方法可用于市售面制食品中Pb的快速测定.
In the presence of surfactant cetyl trimethyl ammonium bromide and an acidic Tris-hydrochloric acid buffer medium,chrome azurol S can be bound with lead (Ⅱ) to form a new product, which leads to a distinctly enhanced resonance Rayleighscattering (RRS) and the appearance of a new RRS spectrum. The maximum RRS peak was located at 369 nm. The massconcentration of lead (Ⅱ) in the range of 0.002 to 0.35 mg/L was directly proportional to the RRS intensity (ΔIRRS) ofsystem with the limit of quantitation (LOQ) being 0.024 mg/kg. Therefore, a rapid, accurate and sensitive new RRS methodfor quantifying lead (Ⅱ) was successfully developed. The optimal reaction conditions and resonance Rayleigh scatteringspectral characteristics were investigated. The method can be used for rapid determination of lead in commercial pastas.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2016年第20期183-186,共4页
Food Science
基金
重庆市教委科技基金项目(KJ1401226)
长江师范学院科技基金项目(2015CXX079)
国家自然科学基金面上项目(21275021)
关键词
溴化十六烷基三甲基铵
铬天青S
PB
面制食品
共振瑞利散射
cetyl trimethyl ammonium bromide
chrome azurol S
lead
flour foods
resonance Rayleigh scattering