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Anion and Cation - Ion Chromatography - IC Analysis
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Ion chromatography (IC) is a separation technique used to analyse aqueous solutions for ionic species.Dionex DX320 Ion Chromatograph

The IC analysis methods available at LPD Lab Services allows the detection, identification and quantification of concentrations of major anions such as:

  • Fluoride (F)
  • Chloride (Cl)
  • Bromide (Br)
  • Nitrate (NO2)
  • Nitrite (NO3)
  • Phosphate (PO4)
  • Sulphate (SO4)

IC can also be used for the following cations:

  • Sodium (Na)
  • Potassium (K)
  • Lithium (Li)
  • Calcium (Ca)
  • Magnesium (Mg)
  • Ammonia ions (NH4)

The laboratory has a UKAS accredited method to measure water soluble anions.

Applications of Anion and Cation Chromatography

The Anions and Cations can be analysed over a large dynamic range of concentrations on a wide range of samples including:-Anion Chromatograph

  • Drinking, towns and demineralised waters.
  • Ionic contamination of PCBs.
  • Ground water and Rainwater.
  • Wastewater or Effluents.
  • Cooling and recirculating water.
  • Analysis of ions in chemical products, beverages, foods, cosmetics, pharmaceuticals.
  • Analysis of Soluble anions and cations on environmental monitoring filters.
  • Analysis of soluble / leachable anions and cations from solid samples such as medical devices, polymers.
  • PCB ionic contamination analysis.
  • Traces of exposure to salt water or sea spray (chloride) promoting corrosion in rust on steel, under or on paint coatings, on aluminium or other metal surfaces.
  • Checks for aggressive ions that might promote corrosion on material surfaces or leached from the bulk like phenolic foam pipe insulation.
  • Determination of anions in bulk materials or from washed or rinsed surfaces.
  • Raw material or chemical Quality specification checks. 
  • Screening of aqueous inks for potentially corrosive species.
  • Degradation and consumption of polymer stabilisers like aryl phosphates and fire retardants.
  • Checking for stress corrosion cracking promoting ammonia species in brass plumbing fittings. 

Methods can also be performed on a diverse range of sample matrices allowing accurate reliable results.
The IC technique also allows detection of rarer anions such as Chlorite, Chlorate, Bromate and Acetate.

Anion Chromatography Detection Limits

The Dionex DX320 ion chromatography system with autosampler is fitted with a self-regenerating suppressor module which removes cations and replaces them with H+.  In doing this the suppressor converts the eluent and analyte to the free acid form reducing the background signal whilst increasing the sample signal.  This gives lower limits of detection and lower limits of quantification.  Although the limit of detection and limit of quantification achieved is dependent on sample size and matrix, typically detection limits of 0.1 ppm down to parts per billion levels are achievable.
 

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