The results showed that, in the presence of anionic or cationic surfactants, the Rh(III)-NDPHPD chromogenic system gives a low absorption, whereas in the presence of nonionic surfactants, the absorption of the chromogenic system increases markedly.
The results showed that, in the presence of anionic or cationic surfactants, the Rh(III)-NDPHPD chromogenic systemgives a low absorption, whereas in the presence of nonionic surfactants, the absorption of the chromogenic system increases markedly.