Abstract

May Kristine O. Bernardo,Voltaire G. Organo*

DOI : http://dx.doi.org/10.13005/ojc/300206

Chlorophyll is utilized as a simple, inexpensive and environment-friendly (“green”) colorimetric indicator for nitrogen dioxide (NO₂) gas. A drastic color change from green to yellow was observed when chlorophyll, either dissolved in CH₂Cl₂ solution or absorbed into paper, was exposed to NO₂ gas. Other gases such as CO₂ and SO₂ did not exhibit any color change with chlorophyll. Spectroscopic analysis showed nitration of chlorophyll as possible cause for the color change.

Chlorophyll; , inexpensive; friendly colorimetric

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