Determination and Comparison of Ion Residues in Different Autosampler Plastic Vials by Ion Chromatography

Objective The present paper compared the ion residues including cations residues and anions residues in autosampler plastic vials from 4 different ion chromatography companies and discussed the relationship between soaking duration time and ion releasing. Methods The separation and determination were carried out by IonPac CS12A cation exchange column, MSA isocratic eluent together with suppressed conductivity detector; and IonPac AS15 anion exchange column, NaOH isocratic eluent together with suppressed conductivity detector. 4 plastic vials from 4 companies were soaked in DI water with a particular volume followed by injecting the liquid samples to IC system in order to measure residue ions with low level(μg/L). Results The detection limits were 0.79-5.28 μg/L.The linear range were 1-20 000 μg/L for Cl-, NO2-, NO3-, SO42-, Na+, K+, Mg2+, Ca2+. The linear coefficients were 0.998 3-0.999 9. RSDs were below 3%.The recovery rates were 83.3%-112%. Conclusion This method satisfies the requirement of practical examination, and the suitable methods for repairing the plastic vials of autosampler is proposed.