Agilent Zorbax Rx |
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Agilent Zorbax Rx-C18 Datasheet General Description Zorbax Rx-C18 is a microparticulate column packing used for reversed-phase high-performance liquid chro- matography. This packing is made by chemically bond- ing a dense monolayer of dimethyl-octadecyl silane stationary phase to a specially prepared, ultra-high purity Zorbax, porous-silica microsphere. The special, inactive Zorbax Rx silica support is designed to elimi- nate properties which can cause strong adsorption of basic compounds. The stationary phase is chemically stable at low pH and gives long column life. As a re- sult, Zorbax Rx-C18 is a stable reversed-phase packing that can be used for basic, neutral, or acidic samples. However, it is particularly well suited for use with basic samples since they often can be chromato- graphed without peak tailing or irreversible adsorp- tion. The uniform, spherical, Zorbax Rx-C18 particles are nominally 5 µm in diameter and have a controlled pore size of 80Å. Columns are loaded to a uniform bed density using a proprietary, high-pressure, slurry- loading technique to give optimum column efficiency. Column Characteristics A typical Quality Control test chromatogram for a 4.6 mm ID x 250 mm column is shown in Figure 1. The actual QC test and performance of your column is de- scribed on the Column Performance Report enclosed with your column. Safety Considerations All points of connection in liquid chromatographic sys- tems are potential sources of leaks. Users of liquid chro- matographic equipment should be aware of the toxic- ity or flammability of their mobile phases. Because of its small particle size, dry Zorbax packings are respirable. Columns should only be opened in a well ventilated area. Operational Guidelines The direction of flow is marked on the column. While it is not harmful to the column, reverse flow should be avoided except to attempt removal of inlet pluggage (see Column Care section). A new column contains a mixture of methanol and wa- ter. Care should be taken not to pass any mobile phase through the column that might cause a precipitate. Zorbax Rx-C18 is compatible with water and all com- mon organic solvents. The use of a guard column is recommended to protect the Zorbax Rx-C18 column and to extend its useful life- time. Avoid use of this column below pH 1.8 or above pH 8.0. Maximum operating pressure for columns up to 9.4 mm ID is 400 bar (6000 psi). Maximum operating temperature is 60°C. |
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