Ion Chromatography Matrix Removal Cartridges (7-Chemistry SPE Kit)
CromSil™ IonPure SPE cartridges are a specialized set of solid-phase extraction cartridges for ion chromatography sample preparation. They are designed to eliminate matrix interferences from your samples before IC analysis, ensuring that your chromatograms are clean and your target ions are accurately measured. The IonPure SPE family encompasses seven distinct chemistries, each targeting a specific class of interfering species – from excess anions like chloride or sulfate to cations like calcium, heavy metals, and even organic matrix components. By incorporating IonPure cartridges into your sample prep workflow, you can remove or neutralize high concentrations of unwanted ions that would otherwise overwhelm the detector or suppressor, enhance detection limits for trace analytes, and protect your IC columns and suppressors from potential damage or fouling. In essence, CromSil IonPure SPE cartridges help deliver “pure” samples for accurate ion analysis, combining ease-of-use with the power of tailored ion-exchange chemistry.
Ion chromatography often deals with real-world samples that contain not just the analytes of interest but also a host of other ionic and organic species. High ionic strength matrices (e.g., seawater, brines, acidic digests) or complex mixtures (like environmental samples with heavy metals or industrial samples with surfactants) can pose challenges: they can overload the IC column/suppressor, cause high background or baseline drift, or interfere by co-elution. CromSil IonPure SPE cartridges address these issues through targeted ion-exchange and adsorption mechanisms. Each cartridge type in the IonPure line is formulated with a specific functional resin to capture or neutralize a particular interference:
Packed with a strong base anion exchanger in the hydroxide (OH⁻) form. When a sample passes through, this cartridge will exchange anions in the sample for OH⁻. How does this help? It effectively removes cationic species by precipitating them as insoluble hydroxides (for example, Ca²⁺ or Fe³⁺ will form hydroxide solids and be retained). It also raises the pH of acidic samples, neutralizing any free acids. Use IonPure-OH to eliminate polyvalent metal cations or to pre-treat acidic samples so that analyte anions are all in their deprotonated form. (Benefit: stops metal cations from later precipitating in the suppressor or column and eliminates acid that could consume suppressor capacity.)
Contains a strong acid cation exchanger in the hydrogen (H⁺) form. It exchanges cations in the sample for H⁺, thereby removing basic cations (like Na⁺, K⁺, Ca²⁺) and simultaneously acidifying the sample (lowering pH). This is especially useful for alkaline samples or samples with high cation content. For example, if you have a high-pH water sample or a sample rich in ammonia or alkaline metals, IonPure-H will capture those cations and release H⁺, making the sample more acidic. That prevents those cations from later interfering (or from overwhelming a cation exchange column, if you’re doing cation IC) and can convert compounds like carbonates into CO₂ (which dissipates) . In anion analysis, removing excessive cations can also help the suppressor work more effectively (since fewer cations need to be exchanged there).
Filled with a strong cation exchanger in the silver (Ag⁺) form. This cartridge is a powerful tool to remove halides such as chloride, bromide, and iodide from samples. As the sample flows, halide anions bind with Ag⁺ to form insoluble silver halide salts (AgCl, AgBr, AgI) which are trapped in the cartridge. Use IonPure-Ag when you have a sample with a very high chloride content (for instance, sea water or salted foods) and you need to measure other anions like nitrate or bromate without the huge chloride peak overwhelming the chromatogram. It’s also great for eliminating interference from chloride or bromide when measuring low-level anions (since Ag⁺ will preferentially grab those halides). Do note: it will remove your analyte if your analyte is a halide (e.g., you cannot measure chloride if you pass the sample through IonPure-Ag, by design). This cartridge essentially acts like a “halide scrubber,” improving detection of other anions by sacrificing chloride/halide response.
Contains a cation exchange resin in the barium (Ba²⁺) form. Its specialty is removing sulfate (SO₄²⁻) from samples. Sulfate ions form insoluble barium sulfate (BaSO₄) upon contact with Ba²⁺ and get retained in the cartridge. High sulfate is common in many samples (e.g., groundwater, industrial effluents) and can be problematic if you’re interested in other anions like nitrate or perchlorate present at low levels – a big sulfate peak can tail or overlap. By using IonPure-Ba, you precipitate out sulfate selectively. This is extremely useful for, say, environmental analysis of drinking water where sulfate might be at 250 ppm but you need to see 1 ppm perchlorate clearly – removing sulfate will clear up the chromatogram around that region. Again, one must use it only when sulfate itself is not the analyte of interest (or if you plan to measure it by difference, but typically you’d use it to remove sulfate entirely).
Contains a cation exchanger in the sodium (Na⁺) form. This one might sound similar to IonPure-H, but the key difference is it exchanges cations for Na⁺ instead of H⁺. Thus, it removes or replaces cations without changing the sample pH. This is particularly useful when you want to remove certain cations (like Ca²⁺, Mg²⁺) that might cause problems (such as forming precipitates with carbonate in the suppressor or causing baseline issues) but you do not want to acidify the sample (perhaps because your analytes are pH-sensitive or you want to keep the carbonate system intact). IonPure-Na will swap out the cations for Na⁺, which is a benign ion in many IC setups (since Na⁺ is often already part of common eluents or will just pass through a suppressor as a spectator ion if using an anion analysis). For example, use IonPure-Na to soften a water sample (remove hardness) before anion IC; the calcium that would have precipitated in the suppressor as CaCO₃ is eliminated, preventing suppressor scaling and keeping baseline noise low.
Filled with a chelated sodium form resin that targets transition metals and divalent metal ions. This cartridge has specialized chelating functional groups (such as iminodiacetate or similar) that bind strongly to heavy metals (like Fe³⁺, Cu²⁺, Pb²⁺) and other multivalent cations. It exchanges them with Na⁺ (since it’s in Na form) but more importantly forms stable complexes, effectively scavenging trace metals from the sample. This is crucial for samples where metal ions could either foul the analytical column or interfere with analyte detection (for instance, metals can catalyze decomposition of some anions or cause ghost peaks by redox reactions). IonPure-Chelate is used in scenarios like removing iron from water samples (iron can ruin columns by precipitation or by interacting with phosphate), or cleaning up industrial samples with metal contaminants before anion analysis. It protects the IC column and suppressor from metal buildup and can also improve recovery of certain anions that might otherwise get complexed by metals (like remove Ca²⁺ that might bind fluoride, thereby improving fluoride measurement).
Packed not with ion exchange resin but a reversed-phase adsorbent (hydrophobic polymer). The purpose of this cartridge is to remove organic substances, surfactants, and hydrophobic compounds from the sample, allowing only inorganic ions to pass through. Many real samples (like soil extracts, biological fluids, industrial mixtures) contain organic molecules that can foul an IC column or suppressor (for example, oils, large organic acids, humic acids). IonPure-RP will adsorb these hydrophobic components, effectively cleaning up the sample by stripping out things that a normal ion exchange column would not retain but could still cause problems. By using this before an anion analysis, you ensure that only the inorganic ions (which will not stick to the RP cartridge) make it through, while greases, hydrophobic acids, and surfactants stay behind on the cartridge. This dramatically improves baseline stability and prevents gradual contamination of the IC system. After using IonPure-RP, samples that were previously impossible to run (due to foaming, detector fouling, or increasing backpressure from organic deposits) become manageable. Essentially, IonPure-RP acts like a guard for organic junk, protecting the downstream ion-exchange analytical column.
Each IonPure cartridge is built on a high-quality polymer resin (styrene/divinylbenzene base for all ion exchangers) with an average particle size of ~50 µm for optimal flow and contact (the RP sorbent is also polymeric, ~550 µm granules since it relies on adsorption over a larger surface area). The exchange capacities range from about 0.4 meq/mL for the chelating resin up to 2.0 meq/mL for others, meaning they can bind a substantial amount of target ions before exhaustion. Typically, these cartridges are used in either a pass-through mode (discard what’s retained, collect what passes for analysis) or trapping mode (retain analytes, elute them later, though for IC cleanup it’s usually pass-through). The format is a standard Luer-slip syringe cartridge that fits in common SPE manifolds or can be attached to a syringe for manual processing. This makes them simple to use in any lab – just condition (if needed), load the sample, and either analyze the filtrate directly or do a quick rinse/elution step as instructed by the method.
In summary, the IonPure SPE technology provides a toolkit of chemical filters. By choosing the right cartridge (or sequence of cartridges) for your sample, you can solve many matrix problems: remove a dominant ion to see the minor ones, neutralize extreme pH, eliminate metals that would otherwise choke the system, and generally make the sample “ion chromatography-friendly.” This extends your IC capabilities to messy samples that would be off-limits otherwise.
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Parameter
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Description/Value
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Cartridge Format
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Disposable polypropylene SPE cartridges, available in 0.5 mL (bed volume) and 1.5 mL bed volume sizes. Each cartridge is pre-packed with the specific resin and ready to use. The smaller 0.5 mL cartridges are useful for smaller sample volumes or lower interference loads, while the 1.5 mL cartridges handle larger samples or higher loads. Both sizes fit standard SPE manifolds and syringe connectors.
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Resin Base
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Styrene/DVB polymer for all IonPure variants (except the RP which is pure hydrophobic polymer). This provides chemical resistance and stability. Resins are highly cross-linked to avoid swelling or degradation in water or common solvents.
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Functional Groups & Counter Ions
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IonPure-OH: Strong base anion exchanger, OH⁻ form.
IonPure-H: Strong acid cation exchanger, H⁺ form. IonPure-Ag: Strong cation exchanger, Ag⁺ form. IonPure-Ba: Strong cation exchanger, Ba²⁺ form. IonPure-Na: Strong cation exchanger, Na⁺ form. IonPure-Chelate: Chelating cation exchanger (iminodiacetate type or similar), Na⁺ form. IonPure-RP: Reversed-phase adsorbent (hydrophobic polymer, no ion-exchange functionality). |
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Average Particle Size
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~50 µm for ion exchangers, ~550 µm for the RP sorbent. The 50 µm particles ensure a good surface area for interaction while maintaining flow rates; the RP uses larger granules to reduce pressure drop while still capturing organics.
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Capacity
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Exchange capacities up to 2.0 meq/mL (for H⁺, Ag⁺, Ba²⁺, Na⁺ forms); IonPure-OH ~1.0 meq/mL; IonPure-Chelate ~0.4 meq/mL (lower due to nature of chelating functional groups). These capacities mean, for example, a 1.5 mL IonPure-H cartridge can neutralize ~3 meq of cations (e.g., ~150 mg of Ca²⁺) before exhaustion. The high capacity ensures one cartridge can treat a typical sample volume (10–50 mL of water) with high interference levels.
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Flow Rates
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Can be used with vacuum manifold or positive pressure. Typical flow rate ~1–5 mL/min for efficient contact. Too high a flow might reduce removal efficiency, so it’s recommended to use moderate vacuum pressure or gentle syringe pressure to allow proper ion exchange kinetics. Under gravity drip or light vacuum, the cartridges quickly process most samples.
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Chemical Compatibility
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All cartridges are stable in aqueous samples (pH 0–14 for most, though the ones in H⁺/OH⁻ form will obviously alter the pH of the sample by design). They can also be rinsed or conditioned with common solvents if needed (e.g. methanol wash for RP cartridge prep). The housing and frits are polypropylene/PE, which tolerate typical lab solvents. Avoid strong complexing agents (EDTA) on the chelating cartridge as it may strip the functional groups’ metal if present. For IonPure-Ag and -Ba, avoid exposure to thiols or carbonate respectively during storage, as those could foul the resin (silver tarnish or barium precipitate). In use, these are minor considerations.
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Usage Protocol
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Generally, condition the cartridge with a few mL of deionized water (and perhaps regenerate ions if needed – e.g., flush an H⁺ cartridge with acid then water if you suspect any partial neutralization during storage). Then pass the sample through. Discard the first few drops (to waste) in case of any leachables, then collect the rest of the effluent for analysis. For IonPure-OH and -H, the effluent will have altered pH (basic for OH, acidic for H); for IonPure-Na, -Ag, -Ba, -Chelate, the effluent pH is roughly same as sample (except minor shifts due to ion removal). The cartridges are single-use (disposable), though for very clean samples one might reuse them in non-critical situations.
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Shelf Life & Storage
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Store cartridges in a cool, dry place. IonPure-Ag and -Ba cartridges are typically shipped in a solution or moist to keep the resin active (and to avoid it drying with precipitates inside). Others can be stored dry. Shelf life is long (years) if kept sealed; once opened, if not used immediately, keep the resin moist and sealed to maintain capacity.
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Comprehensive Matrix Coverage
With 7 specialized cartridges, IonPure SPE offers a solution for virtually every matrix issue in IC. High chloride? Use Ag. High sulfate? Use Ba. Troublesome metals? Use Chelate. Each cartridge selectively targets the “problem” ion without affecting the ions you care about (when properly chosen), thus cleaning up the sample while preserving analyte integrity.
Enhanced Detection & Accuracy
By removing overwhelming background ions and interferences, IonPure cartridges lead to lower background noise and higher sensitivity. Trace analytes that were previously buried under large peaks or suppressed by matrix effects become detectable. e.g., Remove 1000 ppm chloride to see 1 ppm perchlorate, or eliminate excess calcium that was robbing suppressor capacity – the result is clearer signals for the analytes of interest and more accurate quantitation.
Protects IC Columns and Suppressors
IonPure SPE acts as a “safety net” for your expensive analytical columns and suppressor devices. Matrix components that could foul the column (like oils, surfactants) or precipitate in the suppressor (like hardness ions with carbonate) are caught upstream. This means longer column life, more stable suppressor performance, and fewer unplanned maintenance interventions. In the long run, this saves cost and ensures your IC system operates at peak performance with less downtime.
Easy to Use, No Special Equipment
These cartridges integrate seamlessly into existing lab routines. They fit standard SPE manifolds or even a simple syringe setup – no need for complex apparatus. Clear instructions are provided for each cartridge type. For most, it’s as simple as “condition with water, load sample, collect filtrate”. Even technicians not deeply familiar with chemistry can follow the steps to reliably clean up samples.
Fast Sample Processing
SPE is a quick technique – treating a sample through IonPure typically takes only a few minutes. There’s no lengthy incubation or elaborate chemical pretreatment necessary. This speeds up sample turnaround for high-throughput labs. You can process multiple samples in parallel using a 12 or 24-port vacuum manifold, each with the needed IonPure cartridge, to prepare batches of samples rapidly for IC analysis.
Maintains Sample Integrity
Unlike some harsh chemical treatments, IonPure SPE is a physical/chemical separation that doesn’t add significant contaminants to the sample or risk losing analytes (assuming the correct cartridge is chosen that doesn’t retain the analyte). The neutral Na⁺ form and others ensure pH is not wildly swung (except where intended), so your analytes stay in a form ready for IC. And because you’re not adding reagents that might later appear as extra peaks (IonPure generally only introduces the counter ion like Na⁺ which is often already in the IC eluent), you keep your chromatogram free of artifact peaks.
Versatile for Anions or Cations Analysis
While the naming and focus is on anion analysis (since many cartridges target anion analysis issues), some IonPure cartridges can aid cation chromatography too. For example, IonPure-RP will remove organics before either anion or cation IC; IonPure-OH can remove metal cations that might interfere with cation analysis; IonPure-Na could exchange cations to sodium which might be better for some detection. This versatility means a single IonPure kit can support multiple IC methods in your lab.
Cost-Effective Solution
Each cartridge is low-cost and single-use, which eliminates any cross-contamination worries and cleanup steps. Considering the value of preventing column damage or avoiding re-running samples due to interference, these cartridges are highly cost-effective. They essentially act as disposable guards for your analysis. Additionally, buying the full set as a kit ensures you have the right tool on hand for any sample type that comes along, reducing downtime waiting for new reagents or columns.
7 Chemistries in One Kit
The IonPure SPE line can be purchased as a complete kit or individually. The complete set gives labs a ready arsenal – particularly useful for contract testing labs that see a variety of sample types. Having all seven at your disposal means you can troubleshoot any difficult sample by trying the appropriate cartridge (or combination in series for extremely challenging cases). This kind of flexibility can be a game-changer when facing unknown or complex samples.
Improves Method Reliability
By incorporating a sample cleanup step using IonPure, you add a layer of consistency to your method. Day-to-day or sample-to-sample variations in matrix are dampened. For instance, one day your groundwater samples might have a lot of iron, the next day very little – if you always run them through IonPure-Chelate, the downstream IC method “sees” a more consistent matrix (virtually no iron in either case). This leads to more stable retention times and responses, since the IC column isn’t being unpredictably affected by matrix differences. Ultimately, you get better reproducibility and can have greater confidence in your results.
Perhaps the biggest beneficiaries, these labs deal with water, soil, and air extract samples that often contain high levels of common ions (chloride, sulfate, nitrate) and various contaminants. With IonPure SPE, an environmental lab can, for example, remove 99% of chloride and sulfate from a groundwater sample to focus on pollutants like nitrate, bromate, or perchlorate at trace levels. They can eliminate heavy metals from industrial wastewater samples, ensuring those metals don’t skew the analysis of other parameters. Regulatory methods sometimes allow or even suggest sample pretreatments – IonPure provides a standardized, easy pretreatment option. Ultimately, the lab can report results with confidence, knowing interferences were removed and the IC columns remain in good shape even after running challenging samples.
Salted foods, mineral-rich beverages, and fermentation products all contain ions that can complicate IC analysis. For instance, analyzing organic acids in fermented beverages might be hindered by high sulfate or chloride from water sources – IonPure-Ba or -Ag can clear that. In dairy or plant-based drinks, high calcium could cause issues – IonPure-OH or -Na can take out the Ca. If measuring preservatives or nutrients via IC in a complex food matrix, IonPure-RP can remove pigments and organics that would otherwise require laborious sample prep. Food labs appreciate that these SPE steps are quick and help in achieving clearer chromatograms for additives, sugars (as anions after oxidation), etc., improving the reliability of nutritional or safety testing by IC.
Pharmaceutical formulations often contain buffers (phosphates, acetates) and salts. If a lab needs to measure a specific counterion or impurity in the presence of a dominant other ion, IonPure can assist – e.g., remove an overwhelming acetate buffer to look for trace chloride in a drug solution using IonPure-Ag. In biomedical research, when analyzing ions in physiological fluids (urine, blood dialysate), there are many organic compounds present – IonPure-RP could remove those so that anions like citrate or iodide can be measured without background interference. Also, when preparing samples for ion chromatography in cleaning validation (detergents, etc.), IonPure-Chelate could remove metal ions that might be present from manufacturing equipment and interfere with detecting cleaning agent residues.
Industries such as power generation, semiconductors, mining, and chemical production all monitor ionic species in their processes. IonPure cartridges can be used inline or offline to pre-treat samples from boilers, cooling systems, plating baths, or chemical batches. For example, a power plant lab might use IonPure-Na to pre-treat boiler water samples (removing Ca/Mg) before measuring chloride and sulfate, preventing the suppressor from scaling and giving more accurate readings. A semiconductor fab might have trace analysis of anions in ultra-pure water – any organic residue must be removed (IonPure-RP) to maintain the integrity of the analysis. In mining, strong acid samples with dissolved metals can be adjusted using IonPure-OH and IonPure-Chelate to neutralize acid and strip metals before determining anions like cyanide or sulfate. These use cases show how IonPure brings adaptability and problem-solving to industrial labs that can’t afford instrument downtime or inaccurate results due to tough samples.
Researchers developing new analytical methods can use IonPure SPE cartridges as part of method development to understand interference effects. They can simulate worst-case scenarios and then mitigate them with the appropriate cartridge. Academically, these cartridges are great teaching tools to demonstrate principles of ion exchange and sample prep – students can see, for example, how passing a sample through Ag⁺ resin eliminates chloride peaks. In method development, if a new application for IC is discovered (say analysis of a novel matrix), IonPure’s variety gives method developers a quick way to test various cleanup strategies without synthesizing custom resins or columns. The result is faster optimization of robust methods that can handle real-world samples.
In some cases, more than one interference exists. Different IonPure cartridges can be used in series. For instance, a particularly nasty sample might have both high organics and high sulfate – one could first use IonPure-RP to remove organics, then IonPure-Ba to remove sulfate. Application in environmental science: perhaps a contaminated groundwater has high iron and high chloride – use IonPure-Chelate (remove iron) then IonPure-Ag (remove chloride). Knowing this, application segments can mix & match as needed. Thus, IonPure SPE isn’t limited to one-per-sample; they can be chained to solve complex problems. This flexibility is an application advantage in itself, allowing tailored solutions for multi-faceted sample matrices.
Control Your Separations Like Never Before.
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