Abstract
A chemiluminescence mediated procedure for quantitative determination of unsymmetrical dimethyl hydrazine (UDMH) in water bodies is proposed which can be applied for prompt quality control of aqueous media. The UDMH analysis is based on determining an oxidizing agent uptake required for neutralization of the analyzed compound. Potassium permanganate acidified with concentrated sulfuric acid for pH value adjustment up to 1–2 is used as the oxidizing agent. The first step of the procedure involves interaction of potassium permanganate with UDMH followed by chemiluminescence reaction of unreacted oxidant residues with luminol. Measurements of changes in the intensity of light emission in the chemiluminescence reaction are performed for determination of concentration of the oxidizing agent in the reaction mixture, which provides quantitative determination of UDMH content in the sample. The concentration of UDMH is calculated from maximum luminous intensity in the luminol – acidified potassium permanganate system. The proposed method has demonstrated a superior accuracy as compared to the traditional photocolorimetric method for determining UDMH. Moreover, the chemiluminescent reaction allows to reduce significantly the duration of the analytical procedure and accelerates the data processing (the average time of measurement does not exceed 2.5 minutes), i.e. provides express-analysis of UDMH in aqueous solutions, in particular, in the field conditions and mobile laboratories.
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