Detection naphthalenedisulfonate

Naphthalenedisulfonate-acetonitrile as the only mobile phase with a silica column coated with a crosslinked aminofluorocarbon polymer has proven to be an effective combination for the separation of aliphatic anionic surfactants. Indirect conductivity and photometric detection modes are used to monitor these analytes. The retention of these surfactants is found to depend on both the ionic strength and the organic solvent content of the mobile phase. The mechanism of retention is considered to be a combination of both reverse phase and ion exchange processes. Selective separation of both alkanesulfonates and... 

Chromate at a concentration of around 5 mM has been used very successfully for indirect detection of common inorganic anions at a wavelength of 254 nm. A now classic separation of some 30 anions in a single run is illustrated in Fig. 10.2. More recently, Shamsi and Danielson have proposed naphthalenedisulfonate (NDS) and naphthalenetrisulfonate (NTS) for indirect detection of inorganic and organic anions... 

The indirect detection method for lEC depends on the use of an ionic mobile phase that not only controls the retention of the sample ions but also responds to the detector of choice. For example, consider indirect photometric detection. After the ion-exchange separation and during the elution proeess, light-absorbing ions in the mobile phase replaced by photometrically inactive injected sample ions will cause a decreased absorbanee at the detector and negative peaks to be reeorded. For IPC, salicylate or naphthalenedisulfonate has been used for anion separations and Ce(III) or an aromatie amine have been used for... 

All common anionic surfactants may be determined with conductivity detection. Both chemically suppressed and electronically suppressed conductivity methods are effective. Indirect conductivity detection has also been applied to determination of anionics, using a highly conductive eluent such as naphthalenedisulfonic acid (25). 

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