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Dionex offers the greatest variety of analytical methods and columns for bromate analysis. Whether your samples are drinking, waste- or ground waters, Dionex has proven, field tested methods that work! Bromate is commonly regulated in drinking water and bottled water at 10 ppb. Traditionally, ion chromatography (IC) with suppressed conductivity detection has been used for determination of bromate and other DBPs in drinking water, as described in EPA Method 300.1 and ISO 15061. Additionally, the EPA has also approved post column methods 317.0 and 326.0 that rely on absorbance detection of bromate; ISO will soon be proposing a post column method similar to EPA 326.0. At Dionex, we are continually evolving tools that make each of these methods more robust, reliable, sensitive, and easier to use. Dionex has a variety of column choices for the analysis of Bromate such as IonPac® AS9-HC, AS12A, AS19, and AS23. We also make it easier to use hydroxide and carbonate eluents using our patented RFIC® technology by just adding water and eliminating the need to make eluents. RFIC methods have been shown to reduce errors and provide greater consistency from month to month and between different laboratories.

Complex Matrices and Conductivity Detection Revisited

At Dionex, we had a goal of developing a bromate method that uses RFIC and simultaneously removes the need for a post column reagent. The result was an ultra-sensitive IC method that removes interfering matrix ions and increases the sensitivity by a factor of 4. Instead of a trap column, the method uses an analytical column in the first dimension to partially resolve bromate from interfering matrix ions in a large volume sample. The bromate portion is transferred to a trap column, and is then more fully resolved on a smaller diameter, 2nd dimension column. The second column not only provides signal enhancement but also provides additional selectivity since it has different resolving characteristics. This provides confirmation from the same injection!

This new method is currently under development with the US EPA for the analysis and detection of bromate in drinking waters. See Application Note 187: Determination of Sub-µg/L Bromate in Municipal and Bottled Natural Mineral Waters Using Preconcentration with Two-Dimensional Ion Chromatography and Suppressed Conductivity Detection for more information.You can find more about 2-Dimensional IC and the ability to reduce the interference of background matrix ions such as chloride, sulfate and carbonate, making possible quantitation of bromate at levels below 1 ppb.

Dionex Application NoteOverview
AN 208IonPac® AS23 along with the new CRD-300 reduces background noise using carbonate eluent to achieve Less then 1 ppb MDL.
AN 184
IonPac® AS19 can be used to meet new EU 3 ug/L detection limits for natural mineral and spring waters as first shown in AN 167.  Demonstrates that IonPac® AS19 and RFIC® hydroxide eluent  has lower detection limits than IonPac® AS23 carbonate (which replaced AS9-HC).
Two dimensional IC method using IonPac® AS19 (4mm) and IonPac® AS24 (2mm) along with RFIC hydroxide using conductivity detection is comparable and lower than ODA and KI visible detection methods for bromate detection in high ionic strength matrices.
IonPac® AS19, RFIC hydroxide can replace AS9-HC and carbonate eluent using post column KI and visible detection.
IonPac® AS19, RFIC hydroxide can replace IonPac® AS9-HC and carbonate eluent using post column ODA and visible detection
IonPac® AS19, RFIC hydroxide in isocratic mode cannot determine all the inorganic anions like the gradient method in AN 167.
IonPac® AS19, RFIC hydroxide shows improved sensitivity compared to carbonate eluents using conductivity detection.
IonPac® AS9-HC and carbonate eluent using post column KI and absorbance detection
Demonstration of IonPac® AS9-HC and carbonate eluent using post column ODA and absorbance detection
Direct Injection using 250 µl loop AS9-HC to meet 10 ug/L regulatory requirement and conductivity detection.