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Dual Configuration Solutions

Dual ion chromatography is a broad term involving many applications. With the advent of column switching techniques, dual systems, sample and solvent switching, and most importantly—powerful software control, the advantages of dual applications are becoming more accessible and their utility easier to exploit. Dual IC involves applications such as two-dimensional ion chromatography (2-D IC), as well as dual analysis, using simultaneous or sequential injection.

2-D IC is a dual-column technique to enhance analyte selectivity and sensitivity. One example of this application is the detection of low-level toxic compounds in a matrix with interfering analytes.

Dual IC can also refer to dual analysis using simultaneous or sequential injection. These applications are useful in high-throughput applications that require multiple analyses from a single sample. For example, anion and cation analysis can be performed with one injection using only one autosampler. Additional benefits include confirmatory analysis, and dilution elimination by simultaneous injection to a large and small loop. The Dionex ICS-5000 system expands these capabilities even further with dual-parallel conductivity and electrochemical detection. This allows the analysis of poorly conducting but electroactive ions along with highly conductive ions in one injection. An example would be the simultaneous analysis of sulfide along with other sulfur species, such as, sulfite, sulfate and thiosulfate. Another example would be the determination of common anions along with carbohydrates. All Dionex systems are designed for dual-performance analysis while the Dionex ICS-5000 system has expanded capabilities for complex applications, such as 2-D IC.

2-D IC Solutions

Valve switching applications are becoming popular in ion chromatography. The modular design of the ICS-5000 makes reconfiguration of the system for applications such as two-dimensional ion chromatography (2-D IC) easier than ever.

Simultaneous and Sequential Injection for Dual IC

Simultaneous injection is one injection into two different eluent streams. Sequential injection is one injection per eluent stream. Both configurations use only one autosampler for dual detection, and both have advantages and disadvantages.

Simultaneous Analysis of Total Sulfur Species

Simultaneous injection is one injection into two different eluent streams. Sequential injection is one injection per eluent stream. Both configurations use only one autosampler for dual detection, and both have advantages and disadvantages.