Rapid and Highly Sensitive Determination of Low-Molecular-Weight Carbonyl Compounds in Drinking Water and Natural Water by Preconcentration HPLC with 2,4-Dinitrophenylhydrazine

Takeda Kazuhiko

Katoh Shinya

Nakatani Nobutake

Sakugawa Hiroshi

Analytical Sciences

The aim of this research was to develop a simple procedure for a highly sensitive determination of low-molecular-weight (LMW) carbonyl compounds in drinking water and natural water. We employed a preconcentration HPLC system with 2,4-dinitrophenylhydrazine (DNPH) for the determination of LMW carbonyl compounds. A C-18 reverse-phase preconcentration column was used instead of a sample loop at the sample injection valve. A 0.1 - 5.0 mL portion of the derivatized sample solution was injected with a gas-tight syringe, and a 15% acetonitrile aqueous solution was pushed through the preconcentration column to remove the unreacted excess DNPH, which caused serious interference in the determination of formaldehyde. The detection limits were 1 - 3 nM with a relative standard deviation of 2 - 5% for 20 nM standard solutions (n = 5). The calibration curves were essentially unaffected by coexisting sea salts. Applications to commercial mineral water, tap water, river water, pond water and seawater are presented.

化学 [ 430 ]

英語

The Japan Society for Analytical Chemistry

2006 © The Japan Society for Analytical Chemistry

[ISSN] 0910-6340

[ISSN] 1348-2246

[NCID] AA10500785

[DOI] 10.2116/analsci.22.1509

[DOI] https://doi.org/10.2116/analsci.22.1509