期刊
JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
卷 41, 期 19-20, 页码 1092-1097出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10826076.2018.1564326
关键词
Capillary electrophoresis; Eu3+-tetracycline; luminescence; phosphate; small sample size; soil
资金
- Natural Sciences and Engineering Research Council of Canada
A capillary electrophoresis-based method was developed for the detection of phosphate in small samples. Phosphate was incubated in buffer with 50 mu M Eu3+-tetracycline to allow for the formation of the luminescent Eu3+-tetracycline-phosphate complex. The complex was separated from the excess Eu3+-tetracycline, which is also luminescent, and the complex detected by post-column laser-induced luminescence within a sheath flow cuvette. Separation time was <90 s with a total run time of 5 min. No flushing of the capillary was required between runs. Phosphate standards ranging from 10-200 mu M were analyzed. Increasing the concentration of Eu3+-tetracycline increased the linear range but at the cost of a decreased sensitivity. A decrease in the Eu3+-tetracycline resulted in an increase in sensitivity down to 5 mu M but a decrease in linear range. As an application, the phosphate content of a milligram sample of soil was determined to be 0.51 ppm. [GRAPHICS] .
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