What are they?
Most common inorganic impurities are residuals of sodium, calcium, iron, magnesium, chloride, sulphate and nitrate ions. Bicarbonate ions are produced by the dissolution of atmospheric CO2 in the product water due to the exposure to the environment.
Where do they come from?
They are also released from ion exchange media within the purification system as the media capacities are used up.
Which Applications do they effect?
Higher concentrations of less soluble species can lead to the degradation in spray characteristics for ICP-MS and AAS and can degrade column and detector performance in HPLC.