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Column produce poor peak shapes on other columns. These columns can be used for a wide range of applications over a pH range of 2–9, accom- modating most popular mobile phases. Column Characteristics A typical Quality Control test chromatogram for a Poroshell 120 EC- C18, 2.7 µm, 4.6 mm × 50 mm threaded column is shown in Figure 1. The actual QC test and performance of your column is described on the Column Performance Report enclosed with your column. The efficiency reported on the Column Performance Report may be high- er than the efficiency found in your laboratory. The QC test system may vary from the LC used in your lab and has been modified from a standard system to minimize system volume. This allows a better evaluation of the paced column and assures a more consistent product for the chomatographer. Safety Considerations All points of connection in liquid chromatographic systems are potential sources of leaks. Users of LCs and UHPLCs should be aware of the toxicity or flammability of their mobile phases. These Poroshell 120 columns are mechanically stable and have been tested to very high pressures to assure safe lab operation on a vari- ety of LC and UHPLC instruments. The operating pressure limit for all 2.1-, 3.0- and 4.6-mm id columns is 600 bar (9000 psi). While the 2.1- and 3.0-mm id columns are safe to 1300 bar (20,000 psi) and the 4.6-mm id columns are safe to 1000 bar (16,000 psi), chromatograph- ic performance will be compromised if the 600 bar pressure limit is exceeded and the column may need to be replaced. Because of its small particle size, dry Poroshell packings are res- pirable. Columns should only be opened in a well-ventilated area, and opening the column will compromise column performance. Operational Guidelines • The direction of flow is marked on the column. The column should only be operated in this direction. General Description Agilent Poroshell 120 EC-C18 is a superficially porous microparticu- late column packing. Superficially porous silica particles, such as Poroshell, have a solid silica core and a porous silica outer layer. An EC-C18 bonded phase is applied to the totally porous outer layer for this column. This type of particle provides high efficiency at lower pressures when compared to small, totally porous particles and is ideal for fast or high resolution separations of many types of ana- lytes. The Poroshell 120 packing has a solid core of 1.7 µm in size with a porous outer layer 0.5 µm thick and a total particle size of 2.7 µm. The particles have a nominal surface area of 120 m 2 /g and a con- trolled pore size of 120Å. The columns can be used up to an operat- ing pressure of 600 bar (9000 psi). The uniform, spherical particles are ultrahigh purity (>99.995% SiO 2 ) silica. This high purity silica is designed to reduce or eliminate strong adsorption of basic and high- ly polar compounds. The EC-C18 bonded phase is made by first chemically bonding a dense monolayer of dimethyl-n-octadecyl silane stationary phase to the porous shell of the Poroshell 120 silica support. The bonded phase packing is then endcapped for using proprietary reagent and procedures to obtain maximum deactivation of the silica surface. Poroshell 120 EC-C18 is a reversed-phase packing that can be used for basic, neutral or acidic samples. The exhaustive endcapping makes it ideal for use with basic compounds, especially those that |
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