酸性品红共振光散射法测定食品中的锌  

Determination of zinc by resonance light scattering method with acid magenta

作　　者：冉纯明 龙冲 吴征真 江虹[1] 

机构地区：[1]长江师范学院化学化工学院,武陵山片区绿色发展协同创新中心,重庆408100

出　　处：《化学研究与应用》2018年第1期119-122,共4页Chemical Research and Application

基　　金：重庆市教委科技基金资助项目(KJ1401226)资助;长江师范学院科技基金资助项目(2016CXX088)资助

摘　　要：建立了测定面制食品中锌的酸性品红共振光散射方法,研究了共振光散射的光谱特征及适宜的反应条件。在pH 6.88的Tris-盐酸缓冲介质及表面活性剂溴代十六烷基吡啶(TPB)存在下,Zn(Ⅱ)能够与酸性品红-TPB结合生成三元复合物,使共振光散射(RLS)显著增强并产生新的共振散射光谱,在最大散射峰379 nm处,体系的共振光散射增强程度(△IRLS)与0.008~0.25 mg·L^(-1)范围内的Zn(Ⅱ)呈线性关系,定量限为0.028 mg/100 g。方法简便、灵敏,加标回收率为98.9%~102%,相对标准偏差(RSD)(n=6)为2.0%~2.2%。方法用于面制食品中Zn的测定,结果满意。A new acid magenta resonance light scattering method for quantifying zinc in flour food was developed. The spectrum characteristics of resonance light scattering and optimum reaction conditions were studied. In a Tris-Hydrochloric acid buffer medi-um of pH 6. 88 and in the existence of the surfactant hexadecylpyridinium bromide （TPB） , zinc（ I ）can be bound with acid magen- ta-hexadecylpyridinium bromide to form a ternary complexes,which led to a distinctly enhanced resonance light scattering （RLS） of system and the appearance of a new RLS spectrum. In the largest scattering peak at 379 nm,The resonance light scattering enhance intensity（ △IRIS） was directly proportional to the mass concentration of zinc（ II ） in the range of 0. 008 to 0. 25 mg · L^-1 with the limit of quantitation being 0. 028 mg/100 g. The method was simple and sensitive and spiked recoveries and RSD% （n = 6 ） found were in the ranges of 98. 9% ·102% and 2. 0 % ·2. 2 % respectively. The method has been applied to the determination of trace zinc in flour food with satisfactory results.

关 键 词：酸性品红 ZN 溴代十六烷基吡啶 共振光散射 食品 

分 类 号：O657.39[理学—分析化学]