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Configuration:

Extraction Mechanism:

Separation Mechanism:

Sorbent Mass:

Sample Volume:

Disc Diameter:

Retention Capacity:

(%)

Minimum Elution Volume:

Particle Size:

Pore Size:

Tube Material:

Frit Material:

Pre-Filter Included?

Help with Solid Phase Extraction Cartridges and Disks specifications:

Configuration
   Configuration:       
   Your choices are...         
   Disc       SPE disks are popular for large volume sample preparation. The disks resemble the membranes used for filtration but differ in that they have sorbent particles embedded in an expanded PTFE network or fiberglass matrix. The disks are flat, usually 1mm or less in thickness with diameters ranging from 4 to 96 mm. The packing material generally makes up 60 to 90% of the total membrane weight. The small length-to-diameter ratio of the disk enables higher flow rates and faster extractions than can be achieved with cartridges. For example, 1 liter of relatively clean water can pass through a 45-mm disk in approximately 20 minutes but may require one to two hours when using a 15 mm x 18 mm cartridge bed. 
   Cartridge / Column       Traditional solid-phase extraction configuration. Often the barrel of a medical syringe, packed with a small amount of sorbent, usually less than a gram, although cartridges with up to 10 g are commercially available. The packing is contained in the barrel by frits, just like an HPLC column. The diameter of the packing material, usually in the 40-micron range, is larger than used in HPLC. Because efficiency is relatively unimportant in SOPE and cost is more important, irregularly shaped particle packings rather than spherical packings are used. Overall, the principles, of separation phase selection, and method development approaches for SPE are the same as for LC and HPLC. 
   Solid-Phase Microextraction       Uses solid, fused silica fibers coated with a polymeric GC-like stationary phase. The fiber replaces the plunger of a microsyringe. This fiber is dipped into the aqueous solution containing the trace organics to be analyzed. The organics diffuse to and partition into the polymeric coating as a function of their distribution coefficients. Convection speeds up the process. After a predetermined time, the fiber is removed from the solution and placed into the injection port of a gas chromatograph, where the analytes are thermally desorbed. Alternately, the fiber can be placed into the injection port of an HPLC valve, where analytes are displaced by the use of mobile phase or other solvent. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Extraction Mechanism
   Extraction Mechanism:      Extraction mechanism selection is primarily based upon the functional groups present on the analyte and the composition of the sample matrix.
   Your choices are...         
   Polar (Normally Bonded)       The stationary bed is strongly polar in nature and the mobile phase is non-polar or hydrophilic. Polar samples are thus retained on the polar surface of the column packing longer than less polar materials. Good for water-sensitive samples, analytes that are insoluble in water, certain geometric isomers that are difficult to separate by reversed-phase, and class separations. 
   Non-Polar (Reverse Phase)       The inverse of normal phase chromatography. The stationary bed is non-polar (hydrophobic) in nature, while the mobile phase is a polar liquid, such as mixtures of water and methanol or acetonitrile. Here the more non-polar the material is, the longer it will be retained. 
   Ion-Exchange (Cation, Anion, Covalent)       Variations of this are: Cation, Anion, and Covalent. The stationary bed has an ionically charged surface of opposite charge to the sample ions. This technique is used almost exclusively with ionic or ionizable samples. The stronger the charge on the sample, the stronger it will be attracted to the ionic surface and thus, the longer it will take to elute. The mobile phase is an aqueous buffer, where both pH and ionic strength are used to control elution time. 
   Other       Any unlisted, proprietary or specialized extraction method. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Separation Mechanism
   Separation Mechanism:       
   Your choices are...         
   Syringe       The most common method of introducing samples into a solid phase extraction inlet is by means of a microsyringe. Typically this consists of a calibrated glass barrel with a close fitting metal plunger, which is used to dispense a chosen volume of sample by displacement through the syringe needle. 
   Vacuum Manifold       A vacuum is applied to pull sample or wash solvent through the cartridges. To hold test tubes for elutant collection a removable rack is oftentimes located inside of the vacuum manifold. These types of systems are used when many samples need to be analyzed. 
   Centrifugation       This method relies on centrifugal force to drive liquid through the membrane. Increasing the g force (centrifuge speed) increases trans-membrane pressure. Membrane fouling is minimized by design features that result in the g force reaching the membrane at an angle and sweeping accumulated molecules off the surface. 
   Other       Any unlisted, proprietary or specialized separation method. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Performance Specifications
   Sorbent Mass:       The total mass of the adsorption packing. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Sample Volume:       The volume the cartridge or tube can hold. 
   Search Logic:      User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.
   Disc Diameter:       The diameter of the extraction disc. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Retention Capacity:       The amount of a compound that can be retained on the column. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Minimum Elution Volume:       The volume of mobile phase required to elute a solute from the column at maximum concentration (apex). 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Particle Size:       The average particle size of the packing in an SPE column. A 5-mym column would be packed with particles having definite particle size distribution; packings are never monodisperse. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
   Pore Size:       The pore size at which a particle of defined size will be retained with an efficiency below 100% (typically 90-98%). Rating methods differ widely between manufacturers 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
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Materials
   Tube Material:       
   Your choices are...         
   Polypropylene (PP)       Polypropylene is a thermoplastic material exhibiting excellent cold flow, bi-axial strength, and yield elongation properties. It is similar to PVC but can be used in exposed applications because of its resistance to UV, weathering, and ozone. 
   Glass       A homogeneous material with a random, liquid-like (non-crystalline) molecular structure. The manufacturing process requires that the raw materials be heated to a temperature sufficient to produce a completely fused melt, which, when cooled rapidly, becomes rigid without crystallizing.  At ordinary temperatures, glass is a nearly perfect elastic solid, an excellent thermal and electrical insulator, and very resistant to many corrosive media. 
   Other       Any unlisted, proprietary or specialized material. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
   Frit Material:      The porous element at either end of a column that serves to contain the column packing. It is placed at the very ends of the column tube or, more commonly, in the end fitting. Frits are made from stainless steel or other inert metal or plastic, such as porous PTFE or polypropylene.
   Your choices are...         
   Polyethylene       Good resistance to impact over wide temperature range (-40 - 90 C). Limitation is that it has lower creep resistance and inferior fatigue properties compared to polypropylene. Resistant to a wide range of chemicals, most inorganic acids and alkalis at room temperature. Good moisture resistance. Insoluble in organic solvents below 60 C but may be swollen. Limitations are that it is susceptible to weathering, UV light and environmental stress cracking. Alloying of PE with butyl rubber and EPDM improves environmental stress-cracking resistance. Low resistance to permeation by gases and vapors (although HDPE is superior to polypropylene). Attacked by strong oxidizing acids. Dissolves in common solvents above 60 C. 
   Teflon       Teflon membranes are compatible with all solvents, acids and bases, and have no extractables. 
   Steel - Stainless       Stainless steel is chemical and corrosion resistant and can have relatively high-pressure ratings. 
   Glass       At ordinary temperatures, glass is a nearly perfect elastic solid, an excellent thermal and electrical insulator, and very resistant to many corrosive media. (Its optical properties, however, vary greatly, depending on the light wavelengths employed.) The more or less random order of atoms is ultimately responsible for many of the properties that distinguish glass from other solids. One unique attribute of special importance may be called the isotropicity of properties, meaning that such properties as tensile strength, electrical resistance, and thermal expansion are of equal magnitude in any direction through the material. 
   Other       Any unlisted, proprietary or specialized material. 
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Features
   Pre-Filter Included?       Often samples will clog the SPE cartridge or disc prematurely and pre-filters may be needed to process single batches. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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