Ion chromatography techniques

Methods 1 and 3 are EPA approved (Methods 325.3 and 325.1-2, respectively) for chloride determination in wastewater. For multiple ion determination, ion chromatography technique should be followed (see Section 1.8). 

The desirability of an ion chromatography technique using only water as the mobile phase is summarised by Small [2], There are a number of ion chromatographic techniques that, though not widely used, deserve mention because of their simplicity and their potential for further development [3,4], All use water or other polar solvent as the sole component of the mobile phase. This not only eliminates the need for electrolytes and precise eluent make-up, but it avoids many of the detection problems that ionic eluents can impose. Detection can be expected to be very sensitive since the background is essentially deionised water. 

We have recently developed a gas-phase ion chromatography technique and applied it to carbon cluster cations " " and anions""". A pulse of mass-selected cluster ions is injected into a high-pressure drift cell filled with 2-5 torr of helium. The ionic mobilities of different isomeric structures depend on their different collision cross-sections with He, and the isomers are therefore separated while drifting through the cell, under the influence of a weak electric field. The absolute value of the ionic mobility for a given cluster together with computer simulations often allows unambiguous determination of the cluster... 

Hughes and Jones and co-workers (177-179) have developed an ion chromatography technique for the analysis of filtrates obtained from water-based drilling fluids. The use of ion chromatography enables a full analysis of the ionic concentration of all the major cations and anions in the filtrate the technique can also be adopted to determine the con-... 

G. Von Helden, T. Wyttenbach, and M. T. Bowers, Inclusion of a MALDI ion source in the ion chromatography technique Conformational information on polymer and biomolecular ions, Int. J. Mass Spectrom. Ion Process., 146/147 (1995) 349-364. 

In September 1975 ion chromatography was publicly presented at a meeting of the American Chemical Society where the Dionex Corporation exhibited the first commercially available instrument for performing ion chromatography. Several years later, Gjerde et al. developed a variety of ion chromatography, a non-suppressed ion chromatography techniques. 

Table 10.4 Summary of US EPA methods for bromate analysis based on ion chromatography techniques.

Dasgupta et al. [22] as well as Avdalovic et al. [23] independently succeeded to miniaturize a conductivity cell and a suppressor device down to the scale required for CE. Since the sensitivity of conductivity detection does not suffer from miniaturization, detection limits achieved for totally dissociated anions and low molecular weight organics compete well with those of ion chromatography techniques. Thus, capillary elechophoresis with suppressed conductivity detection can be regarded as a complementary technique for analyzing small ions in simple and complex matrices. 

---