ONLINE PERVAPORATION SEPARATION PROCESS FOR THE POTENTIOMETRIC DETERMINATION OF FLUORIDE IN DIRTY SAMPLES

被引:39
作者
PAPAEFSTATHIOU, I [1 ]
TENA, MT [1 ]
DECASTRO, MDL [1 ]
机构
[1] UNIV CORDOBA,FAC SCI,DEPT ANALYT CHEM,E-14004 CORDOBA,SPAIN
关键词
POTENTIOMETRY; PERVAPORATION; FLUORIDE; DIRTY SAMPLES;
D O I
10.1016/0003-2670(94)00602-I
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A selective method for the determination of fluoride in contaminated samples based on pervaporation of a volatile derivative and potentiometric monitoring of the anion after collection in a basic solution has been developed. Fluoride was converted to volatile trimethylfluorosilane by reaction with hexamethyldisilazane, and absorbed in dilute NaOH solution. Both the continuous and stopped-now modes were used in order to accomplish a variable efficiency of the separation process thus enlarging the determination range which was established between 5 and 100 mg l(-1), the precision ranging between 2.60 and 3.58%. The determination of the analyte in samples from different sources (i.e., tap water, well water, fertilizers and ceramic industry wastewater) testifies to its usefulness.
引用
收藏
页码:246 / 252
页数:7
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