PMID: 20631439Jul 16, 2010Paper

Collection of indonaphthol blue on a membrane filter for the spectrophotometric determination of ammonia with 1-naphthol and dichloroisocyanurate

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
Takashi Shoji, Eiko Nakamura

Abstract

In order to determine ammonium ion in water samples, we propose a method based on the Berthelot reaction of ammonia with 1-naphthol and dichloroisocyanurate to form an indophenol blue derivative and collection of the blue compound as an ion pair using Zephiramine on a pure polytetrafluoroethylene (PTFE)-type membrane filter. The ion pair on the filter was eluted with 5.0 mL of acetonitrile, and the absorbance of the eluate was measured at 725 nm. The detection limit of the method was 2.5 microg L(-1) of ammonium ion. We showed that the interference of foreign ions was removed by the addition of EDTA. We also demonstrated the success of the method in determining ammonia in river water and seawater.

References

Oct 29, 2002·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Tomonori TsuboiShoji Motomizu
Dec 21, 2005·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Minoru OkumuraYasushi Seike
Oct 29, 2009·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Mario I VegaBenjamin Bonavida

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