摘要
在pH4.80 Britton-Robinson(B-R)缓冲体系中,铝离子(Al3+)与铬天青S(chrome azurol S,CAS)形成二元络合物,氟离子(F-)的加入对Al3+-CAS二元络合物形成具有竞争性抑制作用,使该体系发生褪色反应,吸光度降低,向该体系中加入离子液体溴化1-十六烷基-3-甲基咪唑([C16MIM]Br)使得上述体系吸光度的改变值更加显著。并在645 nm波长处有最大吸收,氟离子质量浓度在0.050 mg/L^1.0 mg/L内符合朗伯比尔定律。在最佳试验条件下,线性回归方程为A645=0.878C(mg/L)+0.052 4,回归系数R=0.999 2,络合物的摩尔吸光系数ε645=1.67×10^4L/mol·cm。将该法用于南极磷虾中氟含量的测定,结果与氟离子选择电极法测定结果一致,回收率95.8%~106.9%之间。
In the presence of Britton-Robinson(B-R)buffer solution of pH 4.80,aluminum ions(Al3+)form a binary complex with chrome azurol S(CAS). The colour reaction of Al3+ with CAS could be inhibited by adding the fluorine ion(F-),and the maximum absorption was reduced. The change of absorbance could be sensitized by adding the ionic liquid 1-cetyll-3-methylimidazole bromide([C16 MIM]Br). The maximum absorption wavelength of the complex was at 645 nm and the apparent molar absorption coefficient of the complex was 1.67 × 10^4 L/mol·cm. Beer’s law was obeyed for F^- in the range of 0.050 mg/L-1.0 mg/L. Under optimal conditions,the linear regression equation was A645=0.878 C(mg/L)+0.052 4 for fluoride ion with good correlation coefficients R=0.999 2. The developed method was applied to the determination of fluorine ion from Antarctic krill samples,the recoveries were in the range of 95.8 %-106.9 %,consistent with fluoride ion selective electrode method.
作者
沙鸥
刘华
鲍佳琦
周浩
仝瑞
陈丽
王志
覃干景
SHA Ou;LIU Hua;BAO Jia-qi;ZHOU Hao;TONG Rui;CHEN Li;WANG Zhi;QIN Gan-jing(College of Chemical Engineering,Jiangsu Ocean University,Lianyungang 222005,Jiangsu,China;Jiangsu Marine Resources Development Research Institute,Lianyungang 222005,Jiangsu,China;College of Marine Life and Fisheries,Jiangsu Ocean University,Lianyungang 222005,Jiangsu,China;Jiangsu Deep Blue Ocean Fisheries Co.,Ltd.,Nantong 226100,Jiangsu,China)
出处
《食品研究与开发》
CAS
北大核心
2020年第10期173-177,共5页
Food Research and Development
基金
中央财政战略性新兴产业发展资金项目(2017-6)
江苏省“六大人才高峰”高层次人才培养项目(2016-XCL-181)
连云港市“海燕计划”项目(2018-21)
江苏省研究生科研创新计划项目(KYCX19_2272、SJCX190959)
大学生创新创业项目(SY201911641104002、Z201911641104003)。
关键词
离子液体
增敏
分光光度法
南极磷虾
氟
ionic liquid
sensitization
spectrophotometry
antarctic krill
fluoride
