Inline and Offline solutions to remove interfering substances in your matrix

Inline and offline solutions to remove interfering substances in your matrix

Need to remove matrix interferences such as phenolics, metals, cations, anions, or hydrophobic substances that interfere with your ion chromatography (IC) applications? We have both inline and offline solutions, available in a selection of resins to remove specific types of interfering substances.

IC sample preparation products

Remove matrix interferences encountered in your IC applications offline using these Dionex OnGuard II sample pretreatment cartridges. Choose from 12 different resins to remove phenols, metals, cations, anions, or hydrophobic substances. If desired, samples can be processed in parallel using the Dionex OnGuard Sample Prep Station.

Automatically remove alkaline earth and transition metals, neutralize high pH samples, and filter particulates. Dionex Guardcap H vial caps are embedded with Dionex OnGuard H resin and designed for use with AS-DV Autosampler PolyVials.

Automatically remove matrix interference for better performance in many IC applications. Installed between the IC autosampler and injection valve, these cartridges remove cations (including transition metals), anions, or hydrophobic substances. Dionex InGuard cartridges are available in a versatile selection of resins including Ag, H, Na, HRP and Na/HRP.

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

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