Analytical Sciences

Liquid Core Waveguide Spectrophotometry for the Sensitive Determination of Nitrite in River Water Samples

Hiromi TAKIGUCHI,* Azusa TSUBATA,* Makoto MIYATA,* Tamao ODAKE,* Hiroki HOTTA,* Tomonari UMEMURA,** and Kin-ichi TSUNODA*

*Department of Chemistry, Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan
**Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan

A flow injection analysis system was built with a liquid core waveguide spectrophotometric detector using an 80 cm Teflon AF-1600 capillary tube (2,2-bistrifluoromethyl-4,5-difluoro-1,3-dioxole/tetrafluoroethylene). The system was applied to determine nitrite ion in river water samples. The lower limit of detection for nitrite was 2.1 nmol dm^-3 (0.1 ng dm^-3 as NO₂^-) and the relative standard deviation of measurements was typically 0.56% (n = 5) at 0.21 µmol dm^-3.

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