Cetyldimethylbenzylammonium chloride

Wang, L.K. Analyzing cetyldimethylbenzylammonium chloride by using ultraviolet absorbance. Indust. Engng. Chem. Prod. Res. Devel. 1976, 15 (1), 68-70. 

Use is made, for example, of cetyldimethylbenzylammonium chloride and pyridinium compounds of the type... 

Apart from the method presented above involving 5-Br-PADAP, many other methods for cadmium determination are based on chelating azo dyes, such as PAN [35-39], PAR [40-45] (formulas 4.1 and 4.2). The complex of Cd with PAN, in the presence of surfactants, has an absorptivity close to 5-10 [36]. The complex of Cd with PAR, in the presence of cetyldimethylbenzylammonium chloride, can be extracted into CHCI3 (e = 9.8-10 ) [40]. Other surfactants also have been applied [43]. Among other pyridylazo reagents proposed for determining cadmium are 2-(2-pyridylazo)-l-naphthol-4-sulphonic acid [46] and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol (e= 1.2-10 at 550 nm) [47]. 

In the presence of antipyrine and acetate ions, the In-PAR complex can be extracted into chloroform [24], Another method for determining In is based on a mixed complex with PAR and V-p-chlorophenyl-2-furanhydroxamic acid (CHCI3) [25]. The In-PAR complex is also extracted in the presence of cetyldimethylbenzylammonium chloride (e = 6.8-10 at 510 nm [26]. 

Besides PAN, numerous other pyridylazo reagents have been proposed for spectrophotometric determination of Zn. This group comprises the related reagent PAR [14,47-50]. The complex of Zn with PAR is extracted with chloroform in the presence of cetyldimethylbenzylammonium chloride (e = 9.1-10 ) [51]. Zinc (and other heavy metals) are preconcentrated on a cation-exchanger, modified with PAR [52]. Bromo- and chloro-derivatives of pyridylazo compounds have become a basis for more sensitive methods, e.g., 5-Br-PADAP, (formula 4.3) [53,54], 2-(3,5-dibromo-2-pyridylazo)-5-diethylaminophenol (3,5-diBr-PADAP) (e = 1.3-10 at 570 nm) [55], and other bromine derivatives [56]. Application of the chlorine derivatives of pyridylazo reagents has been reviewed [53,57,58]. 

One factor in assessing the quality of surface waters is the amount of suspended solids or, "how muddy is it " For example the standard for many rivers and streams is 100 mg/L. If more than this occurs that segment of the stream is declared "impaired." Much of this solid material is colloidal and cannot be filtered under ordinary means. In water treatment plants, aluminum hydroxide is used to surface adsorb or simply trap the solids, and this floe then either settles out or is filtered by a gravel bed. It has been found that cationic surfactants will surface adsorb to most of the solids suspended in water, and this coating will attach to air bubbles passing th ough the system. Some surfactants proven effective are cetyldimethylethylammonium chloride, cetyldimethylbenzylammonium chloride, cetylpyridinium chloride, and ethylhexadecyldimethyl ammonium bromide. These are all antiseptics as well and are used in many mouthwashes. Only a few ppm are necessary (10 to 60) to provide clarification, and the LDjq s are in the range of 500 mg/kg. 

HETEROGENEOUS PHOTOCATALYTIC DEGRADATION OF THE CATIONIC SURFACTANTS CETYLDIMETHYLBENZYLAMMONIUM CHLORIDE AND CETYLPYRIDINIUM CHLORIDE... 

This paper contains some preliminary experiments describing the photodecomposition of two cationic surfactants, cetyldimethylbenzylammonium chloride (CDBACl) and cetylpyridinium chloride (CPCl) with naked and with Pt loaded Ti02 as photocatdysts using light of low intensity (lower than the AMI and the light that has been usually used in the literature). 

Dodecylpyridinium chloride Myristoylpyridinium chloride Cetylpyridinium chloride Cetyltrimethylammonium chloride Cetyldimethylbenzylammonium chloride Octadecylpyridinium chloride... 

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