Need to remove matrix interferences such as metals and cations, or hydrophobic organic substances and surfactants that interfere with your ion chromatography (IC) applications? Thermo Scientific Dionex Guardcap Vial Caps provide a smart, automated sample preparation and filtration solution for your IC analyses.
The Dionex Guardcap Vial Cap embeds resin that removes specific types of interfering substances from your matrix. The Guardcap Vial Cap is placed on top of 5mL Dionex PolyVials in the Dionex AS-DV autosampler. The Dionex AS-DV holds 50 vials that can be sampled in any order, and programmed to take multiple samples from each vial. The vial design eliminates the need for an external sampling pump. Important parameters that can affect the reproducibility of sample preparation such as timing, flow rate, and delivery volume are easily set and controlled by the autosampler.
There are three versions of Dionex Guardcap Vial Caps currently available:
Automatically remove alkaline earth and transition metals, neutralize high pH samples, and filter particulates. Dionex Guardcap H vial caps are embedded with Thermo Scientific Dionex OnGuard H resin.
Automatically remove alkaline earth and transition metals and filter particulates without changing the sample pH. Dionex Guardcap Na vial caps are embedded with Dionex OnGuard Na resin. Since sample pH remains unchanged, Dionex Guardcap Na vial caps are ideal for treating samples that contain pH-sensitive analytes (e.g., nitrite).
Automatically remove particulates and hydrophobic organic substances including non-ionic surfactants, hydrocarbons, aromatic dyes, and some carboxylic acids. Dionex Guardcap HRP vial caps are embedded with hydrophilic reversed phase resin.
Thermo Scientific Dionex Guardcap AEX vial caps are embedded with anion-exchange resin in borate form to automatically remove anions, neutralize acidic samples, and filter particulates.
Dionex Guardcap Chemistries and Example Applications
|Product||Functionality||Capacity (μeq/cap)||Solvents||pH Stability||Example Application|
|Dionex Guardcap H Vial Caps||Cation-exchange hydronium form||50||0-20% HPLC solvents||0-14||Removal of alkaline earth and transition metals; pH adjustment of basic samples|
|Dionex Guardcap Na Vial Caps||Cation-exchange sodium form||50||0-20% HPLC solvents||0-14||Removal of alkaline earth and transition metals|
|Dionex Guardcap HRP Vial Caps||Hydrophilic reversed phase||20 mg benzoic acid at pH <4||0-20% HPLC solvents||0-14||Removal of hydrophobic organics and surfactants|
|Dionex Guardcap AEX Vial Caps||Anion-exchange borate form||50||0-20% HPLC solvents||0-14||Removal of anions; pH adjustment of acidic samples|
|Dionex Guardcap H||Dionex Guardcap Na||Dionex Guardcap HRP||Dionex Guardcap AEX|
|Save time and effort vs. offline sample prep||●||●||●||●|
|Protect columns and suppressors||●||●||●||●|
|Remove transition metals||●||●|
|Remove alkaline earth metals||●||●|
|Neutralize basic samples||●|
|Leave sample pH unchanged||●||●|
|Neutralize acidic samples||●|
|Remove some surfactants||●|
|Remove aromatic dyes||●|
|Remove hydrophobic substances||●|
|Remove some carboxylic acids||●|