节点文献
胶束增溶光度法测定粮食制品中锌的研究
Study on the determination of zinc in grain products with solution effect spectrophotometry
【摘要】 研究了在混合表面活性剂PVA—OP存在下,在0.05mol·L-1的H2SO4介质中,锌与KSCN、罗丹明B形成水溶性离子缔合物,该显色体系λmax=592nm,表观摩尔吸光系数ε592=9.3×105L·mol-1·cm-1,锌含量在0~5μg/25ml范围内符合比尔定律。用于小麦粉、即食面、乳儿粉等粮食制品中微量锌的测定,结果满意。
【Abstract】 It is found that in 0.05mol·L-1H2SO4 solution a ternary complex is formed among Zn(Ⅱ),SCN- and Rhodamine B in the presence of PVA-OP.The absorption maxima of this complex is found to lie at 592nm with an apparent molar absorptivity of 9.3×105L·mol-1·cm-1.Beer’s law is obeyed over the concentration range of 0~5μg of Zn per 25ml.This method has been applied to the direct determination of trace zinc in grain products with satisfactory results.
- 【文献出处】 粮油食品科技 ,Science and Technology of Cereals,oils and Foods , 编辑部邮箱 ,2001年06期
- 【分类号】TS210.7
- 【被引频次】2
- 【下载频次】40