Dmitrienko S G, Sviridova O A, Pyatkova L N, Senyavin V M
Lomonosov Moscow State University, Chemical Department, Division of Analytical Chemistry, Leninskie Gory, Moscow 119992, Russia.
Anal Bioanal Chem. 2002 Oct;374(3):361-8. doi: 10.1007/s00216-002-1513-6. Epub 2002 Sep 11.
The chemical reactions of the functional groups in polyurethane foams (PUF) have been studied by use of diffuse reflectance spectroscopy and infrared spectroscopy. It was found that the functional groups are highly reactive towards diazotization by sodium nitrite, azo coupling with 4-nitrophenyldiazonium tetrafluoroborate, oxidation by active chlorine, and condensation with formaldehyde, resulting in the formation of intensely colored products. Heterogeneous chemical reactions of PUF with these compounds in aqueous solution proceed rapidly at room temperature and at low solute concentrations. PUF do not undergo degradation as a result of chemical interactions. The linear response of the Kubelka-Munk function to analyte concentration makes it possible to recommend PUF as solid chromogenic reagents for the determination of nitrite, nitrate, and 1- and 2-naphthols.
利用漫反射光谱法和红外光谱法研究了聚氨酯泡沫（PUF）中官能团的化学反应。结果发现，这些官能团与亚硝酸重氮化、与四氟硼酸4-硝基苯重氮盐偶氮偶联、与活性氯氧化以及与甲醛缩合反应活性很高，会生成颜色很深的产物。PUF与这些化合物在水溶液中的多相化学反应在室温及低溶质浓度下迅速进行。PUF不会因化学相互作用而降解。Kubelka-Munk函数对分析物浓度的线性响应使得推荐将PUF作为测定亚硝酸盐、硝酸盐以及1-萘酚和2-萘酚的固体显色试剂成为可能。
