| Popis: |
A new ion chromatography method was developed for perchlorate analysis using a Dionex AS-16 Separation Column. The AS-16 method proved to be more sensitive and selective than either the AS-5 or the AS-11 method, with a method detection limit for perchlorate of 0.19 ug/L. The higher capacity of the AS-16 analytical column allows trace level perchlorate to be detected in samples that could not be analyzed with either of the previous ion chromatography methods, due to the high concentrations of inorganic and organic contaminants. The method was shown useful in analyzing environmental samples that contained up to 15,000-ppm total dissolved solids, as compared to the AS-11 method, which could not detect perchlorate in samples containing 7,000-ppm total dissolved solids. A sample preparation method was also developed in order to remove interference ions, which can block the perchlorate signal to the detector. This preparation method reduces the background noise and increases the sensitivity of perchlorate analysis in environmental and industrial matrices. |
