Analytical Sciences

Development of a Compact System for the Determination of Lead Using a Liquid Core Waveguide and a Blue Diode as a Light Source

Tomoki YABUTANI,* Honami KUROKAWA,* Yuka HAYASHI,* Hiromichi HIGUCHI,* Yuki IWATA,* Yuya HASHIZUME,*,** Shuji WADA,*,** Yukako HAYASHI,* and Junko MOTONAKA*

*Department of Chemical Science and Technology, Institute of Science and Technology, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
**Taiho Pharmaceutical Co., Ltd., 224-2 Hiraishi Ebisuno, Kawauchicho, Tokushima 771-0194, Japan

A simple and compact system was developed for the on-site analysis of lead in environmental water samples. The system consisted of a custom-made blue diode as a light source, a liquid core waveguide (LCW) as spectrophotometric cell and a compact UV-visible spectrometer. It weighed within 1.5 kg in total. Lead was detected using a spectrophotometric indicator reagent (TPPS: 5,10,15,20-tetraphenyl-21H,23H-porphinetetrasulfonic acid, disulfuric acid, tetrahydrate) after masking interfering ions by coprecipitation with magnesium hydroxide. With an increase in the length of the LCW cell, the detection limit of lead was almost linearly enhanced, and the linear calibration range was shifted to a lower concentration range. The detection limit of lead by using 100 cm of a LCW cell was 2 nmol dm⁻³. The observed value (9.6 ± 0.4 μg dm⁻³) of lead in a river-water reference material (JSAC 0302-3) with this system was in good agreement with the certified value (9.9 ± 0.2 μg dm⁻³).

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