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
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 AEX Vial Caps
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 (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 Guardcap AEX Vial Caps | Anion-exchange borate form | 50 | 0-20% HPLC solvents | 0-14 | Removal of anions; pH adjustment of acidic samples |
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Dionex InGuard Sample Preparation Cartridges
Automatically remove matrix interference for better performance in many IC applications. Installed inline between the IC autosampler and injection valve, these cartridges remove cations (including transition metals), anions, or hydrophobic substances. Thermo Scientific 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 |
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Offline benchtop IC sample preparation products
Dionex OnGuard II Sample Pretreatment Cartridges
Remove matrix interferences encountered in your IC applications offline using these Thermo Scientific 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.
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 |