摘要
在pH11.0NH3-NH4Cl缓冲介质中,Ca2+与DBS-偶氮胂(DBS-ASA)形成蓝色络合物,该络合物的组成比为Ca(Ⅱ):(DBS-ASA)=1:2,最大吸收波长位于610nm处,表观摩尔吸光系数6ε10nm=1.20×104L.mol-1.cm-1,钙量在0~25μg/25mL范围内遵守比耳定律。本法用于茶叶、食盐样品中钙的测定,结果满意。
Calcium() reacts with DBS-arsenazo to produce a 1:2 (M:R) blue complex in NH_3-NH_4Cl buffer solution medium at pH 11.0. The maximum absorption wavelength of the complex locates at 610 nm. The apparent molar absorptivity of the method is ε_(max) = 1.2010~4 Lmol^(-1) cm^(-1). Beer's law is followed over the range of 0~25μ of calcium in 25 mL of solution. The method was used in the determination of calcium in tea and table salt samples. The results obtained are satisfactory.
出处
《长春理工大学学报（自然科学版）》
2005年第2期67-68,60,共3页
Journal of Changchun University of Science and Technology(Natural Science Edition)
关键词
钙
分光光度法
DBS-偶氮胂
茶叶
食盐
<Keyword>calcium
spectrophotometry
DBS-arsenazo
tea
table salt.
