Inline and Offline solutions to remove interfering substances in your matrix

Remove interfering substances from your sample for ion chromatography analysis

Need to remove matrix interferences such as phenolics, metals, cations, anions, or hydrophobic substances that interfere with your ion chromatography (IC) applications? Here is an array of automated (inline) and benchtop (offline) solutions. These solutions contain resins that are specific for removing the substance interfering with your IC analysis.

IC sample preparation products

Automated inline IC sample preparation products

Dionex Guardcap Vial Caps

Dionex Guardcap Vial Caps

Thermo Scientific Dionex Guardcap Vial Caps work with 5mL Dionex PolyVials in the Dionex AS-DV autosampler to provide an automated inline sample preparation and filtration solution. 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. Three versions of the vial caps are currently available:

Dionex Guardcap H Vial Caps

Thermo Scientific Dionex Guardcap H vial caps are embedded with Dionex OnGuard H resin to automatically remove alkaline earth and transition metals, neutralize high pH samples, and filter particulates.

Dionex Guardcap Na Vial Caps

Thermo Scientific Dionex Guardcap Na vial caps are embedded with Dionex OnGuard Na resin to automatically remove alkaline earth and transition metals and filter particulates without changing the sample pH. Since sample pH remains unchanged, Dionex Guardcap Na vial caps are ideal for treating samples that contain pH-sensitive analytes (e.g., nitrite).

Dionex Guardcap HRP Vial Caps

Thermo Scientific Dionex Guardcap HRP vial caps are embedded with hydrophilic reversed phase resin to remove particulates and hydrophobic organic substances including non-ionic surfactants, hydrocarbons, aromatic dyes, and protonated carboxylic acids.

Dionex Guardcap chemistries and example applications

Product Functionality Capacity (meq/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 InGuard Chemistries and Example Applications

Cartridges Functional groups Capacity (meq/cartridge) Mode of use Example application
Dionex InGuard Ag Cartridges Ag+ form sulfonate 5–5.5 Ion Exchange Removal of halides by precipitation
Dionex InGuard H Cartridges Hydromium form
sulfonate
5–5.5 Ion Exchange Removal of alkaline earth and transition metals, pH adjustment of basic samples
Dionex InGuard Na Cartridges Na+ form sulfonate 5–5.5 Ion Exchange Removal of alkaline earth and transition metals
Dionex InGuard HRP Cartridges Hydrophilic divinylbenzene 2g Adsorption,
π-π Bonding
Removal of hydrophobic species, azo-, and cyano-containing species
Dionex InGuard Na/HRP Cartridges Dual functionality 50% Na / 50% HRP Ion Exchange (Na) and Adsorption Remove Ca2+ (Na) and lipids (HRP) from dairy

Offline benchtop IC sample preparation products

Dionex OnGuard II Chemistries and Example Applications

Cartridge Functionality Capacity (meq / cartridge) Solvents pH Stability Mode of Use
1-cc 2.5-cc
Dionex OnGuard II A Cartridges Anion-exchange bicarbonate form 0.7 1.75 0–100% HPLC solvents 0–14 Removal of anions; pH adjustment of acidic samples
Dionex OnGuard II Ag Cartridges Cation-exchange silver form 2.0–2.2 5.0–5.5 0–100% HPLC solvents 0–14 Removal of chloride, bromide, iodide by precipitation
Dionex OnGuard II Ba Cartridges Cation-exchange barium form 2.0–2.2 5.0–5.5 0–100% HPLC solvents 0–14 Removal of sulfate by precipitation
Dionex OnGuard II H Cartridges Cation-exchange hydronium form 2.0–2.2 5.0–5.5 0–100% HPLC solvents 0–14 Removal of alkaline earth and transition metals; pH adjustment of basic samples
Dionex OnGuard II Na Cartridges Cation-exchange sodium form 2.0–2.2 5.0–5.5 0–100% HPLC solvents 0–14 Removal of alkaline earth and transition metals
Dionex OnGuard II M Cartridges Iminodiacetate ammonium form 0.4 1.0 0–100% HPLC solvents 0–14* Concentration of transition metals by chelation (2.5-cc format); removal of transition metals (1-cc format)
Dionex OnGuard II P Cartridges Polyvinylpyrrolidone 6.0 Format not available 0–100% HPLC solvents 1–10 Removal of phenols, azo dyes, humic acids by complexation
Dionex OnGuard II RP Cartridges Polydivinylbenzene 0.3 g resin 0.75 g resin 0–100% HPLC solvents 0–14 Removal of surfactants, high MW carboxylic acids, aromatic dyes by adsorption
Dionex OnGuard II Ag/H Cartridges Cation-exchange silver form; cation- exchange hydronium form Format not available 4.6 (Ag) 0.8 (H) 0–100% HPLC solvents 0–14 Removal of chloride, bromide, iodide by precipitation; removal of alkaline earth and transition metals; pH adjustment of basic samples
Dionex OnGuard II Ba/Ag/H Cartridges Cation-exchange silver form; cation- exchange barium form; cation-exchange hydronium form Format not available 2.2–2.6 (Ba) 2.2–2.6 (Ag) 0.8 (H) 0–100% HPLC solvents 0–14 Removal of chloride, bromide, iodide by precipitation; removal of alkaline earth and transition metals; pH adjustment of basic samples; removal of sulfate by precipitation