Reduces Carbonate for Improved Sensitivity

The Carbonate Removal Device (CRD 200) removes carbon dioxide from the suppressed eluent stream by diffusion through the walls of a gas permeable membrane. With carbonate eluent systems it reduces the background signal to nearly the same levels as that  of hydroxide eluents. Plumbed after the suppressor, the carbon dioxide transfer is aided by a countercurrent flow of basic solution.

• The CRD 200 is optimized for the removal of carbonate from hydroxide eluent systems
• Minimizing carbonate using the CRD 200 can improve quantification
• The increased membrane length of the CRD 300 is optimized for carbonate eluent systems
• Reducing the baseline with a CRD 300 results in higher sensitivity
• Elimination of the carbonic acid matrix with a CRD 300 increases the linearity range

Exposure to carbon dioxide can cause samples to become contaminated with carbonate. High levels of carbonate originating from dissolved carbon dioxide can interfere with the accurate determination of analytes of interest, such as sulfate and nitrite.

The CRD 200 can be installed easily in any Dionex IC system equipped with an eluent generator, CR-ATC, and ASRS^® 300 or ACES^® 300 suppressor. The CRD 200 requires no reagents or software control. The CRD 200 is a low-dispersion device designed specifically for use with hydroxide- and borate-based chemistries using Dionex columns.

The CRD 200 is available in three formats. The CRD 200 (4 mm) supports carbonate removal from standard bore systems, the CRD 200 (2 mm) supports carbonate removal from microbore systems, and the CRD 200 (Capillary) supports carbonate removal from capillary-scale systems at flow rates of 5 – 30 μL/min