Welch SPE Products

Welchrom silica SPE products select amorphous silica gel of high quality and high purity with an average particle size of 45 μm, an average pore diameter of 60Å, Pore volume of 0.80cm3/g and Surface area of 480m2/g. This kind of silica gel is an ideal choice for extraction with moderate resistance and flow rate. In addition, Welch uses unique surface treatment technology when bonding silicone. Further, the bonding phase also adopts a more stable three-way bonding mode, which ensures the constant extraction recovery rate of the analytes. At present, the most commonly used adsorbent in SPE is still silica gel or bonded silica gel with pH range of 2-7.5. There are various kinds of silica based adsorbents can be selected.

Welchrom polymer based packing materials have overcome the shortcomings of traditional silica matrix packing materials, and the use proportion of SPE has been increasing gradually. The pH range is wide (0-14), and can be used with most organic solvents. There is no active hydroxyl group on the polymer surface, which eliminates the influence of secondary adsorption caused by insufficient recovery rate of basic compound. Polymer matrix has large adsorption capacity and higher recovery rate for most organic compounds, organic compounds are prone to be quantitatively eluted after adsorption, so the analysis results have great reproducibility.