PMID: 11917990Mar 29, 2002Paper

Automated analysis of nanomolar concentrations of phosphate in natural waters with liquid waveguide

Environmental Science & Technology
Jia-Zhong Zhang, Jie Chi

Abstract

Concentrations of phosphate in natural waters are often below the detection limits of conventional nutrient autoanalyzers, by either gas-segmented continuous-flow analysis orflow injection analysis. A liquid waveguide capillary flow cell has been used to extend the sensitivity of a conventional autoanalyzer for the automated analysis of nanomolar concentrations of phosphate in natural waters. Total reflection of light can be achieved within the liquid core of the flow cell because the refractive index of a cell wall coated with Teflon 1600 is lower than that of water. This property allows the manufacturers to construct long liquid waveguide capillary flow cells in a helical, rather than a linear shape, with compact dimensions. A small sample volume is required because the internal volume of a 2-m long capillary flow cell is only approximately 0.5 cm3. Adaptation of this long flow cell to autoanalyzers significantly enhances the sensitivity of automated colorimetric analysis of phosphate with a molybdenum blue method, allowing for the accurate and precise determination of nanomolar concentrations of phosphate in natural waters. The advantages of this technique are a low detection limit (0.5 nM), a small sample volume (2 mL), hig...Continue Reading

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Citations

Jun 29, 2011·Environmental Science & Technology·Jia-Zhong Zhang, Xiao-Lan Huang
Oct 17, 2013·Environmental Science & Technology·Helle Astrid KjærMatthias Bigler
Dec 25, 2013·Proceedings of the National Academy of Sciences of the United States of America·Christian SchlosserC Mark Moore
Jan 25, 2006·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Jia-Zhong Zhang
Apr 6, 2016·Analytica Chimica Acta·Paul WorsfoldPhil Monbet
Jul 30, 2015·FEMS Microbiology Ecology·Karen TaitStephen Widdicombe
Jul 7, 2009·Talanta·Natchanon Amornthammarong, Jia-Zhong Zhang
Jan 31, 2008·Applied Spectroscopy·Tatiana G LevitskaiaOleg B Egorov
Nov 25, 2017·Scientific Reports·Jia-Zhong ZhangJames A Hooper V
Mar 4, 2020·Microorganisms·Joanna L DixonHendrik Schäfer
Mar 3, 2019·Metabolites·Daniel A WhiteCarole A Llewellyn
Dec 31, 2009·Analytical Chemistry·Wan-Ling ChengJyh-Myng Zen
May 25, 2007·Chemical Reviews·Lawrence H KeithJennifer L Young
Sep 28, 2010·Environmental Science & Technology·Xiao-Lan Huang, Jia-Zhong Zhang

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