EUROLAB, with its state-of-the-art accredited laboratories and expert team, provides precise and fast testing services within the scope of EN ISO 10304-3 testing. This part of ISO 10304 covers methods for the determination of dissolved anions in aqueous solution.
Separation of ions is accomplished by liquid chromatography using a separation column. A low-capacity anion exchanger is used as the stationary phase, and aqueous solutions of salts of weak monobasic and dibasic acids are generally used as mobile phases.
The addition of organic substances such as 4-hydroxybenzonitrile or organic solvents to the eluent can be used to accelerate elution or reduce residue effects, especially for the analysis of the more strongly polarizable ions iodide, thiocyanate and thiosulfate.
Solutions of salts of weakly dissociated acids such as sodium hydroxide and sodium carbonate/sodium hydrogen carbonate, sodium hydrogen carbonate and sodium tetraborate are used to practice the suppressive technique.
Prepare standard solutions with different anion composition and concentration from stock solutions, depending on the expected concentrations. The risk of concentration changes caused by interaction with the container material increases with decreasing anion concentration. Store standard solutions in polyethylene containers.
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