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投稿时间:2019-07-01
投稿时间:2019-07-01
中文摘要: 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=1.67×104L/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。
Abstract: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 ([C16MIM]Br).The maximum absorption wavelength of the complex was at 645 nm and the apparent molar absorption coefficient of the complex was 1.67× 104L/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=0.878C(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.
文章编号:202010029 中图分类号: 文献标志码:
基金项目: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)
作者 | 单位 |
沙鸥,刘华,鲍佳琦,周浩,仝瑞,陈丽,王志,覃干景 | 江苏海洋大学化学工程学院,江苏连云港222005;江苏省海洋资源开发研究院,江苏连云港222005;江苏海洋大学海洋生命与水产学院,江苏连云港222005;4.江苏深蓝远洋渔业有限公司,江苏南通226100 |
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