Thermo Scientific Dionex Ion Chromatography Solutions Global water safety bromate analysis in drinking water

Safe drinking water public health assurance As a vital limited resource required for survival, water fit for human consumption must be produced from natural sources such as ground and surface reservoirs. Since a clean water supply is the single most important determinant of public health, these ground and surface water reservoirs must undergo a purification process to ensure that all undesirable chemicals, biological organisms, and suspended solids are removed. As part of the purification process, water is often treated with ozone. Due to its high degree of oxidative reactivity, ozone effectively...

Regulatory leaders ion chromatography IC plays an important role in the analysis of ozone-treated drinking water. Over the past two decades, we’ve led the effort to develop sensitive and robust IC methods that help water treatment facilities ensure that bromate levels remain below the regulatory limit before water is released for consumption. Bromate can be separated using different column chemistries and detected using a variety of detection techniques. Which one to use primarily depends on the sample and the detection limits required. When matrix conditions allow, suppressed conductivity detection...

EPA Methods 300.0 B/300.1 & ISO Method 15061 IC with suppressed conductivity detection Since EPA Methods 300.0 and 300.1 were written over ten years ago, bromate determination using suppressed conductivity detection has been the preferred application. While carbonate/bicarbonate eluents have commonly been used for these methods, our columns are designed to work with both carbonate and hydroxide eluents. the determination of bromate at 5 µg/L along with the detection of bromide at 10 µg/L. The high-capacity Dionex IonPac™ AS19 column is designed to work with hydroxide eluent. Since the suppression...

Bromate analysis using Reagent-Free IC systems While EPA Methods 300.0 B and 300.1 have traditionally used a manually prepared eluent, Thermo Scientific has improved sensitivity and reproducibility with the introduction of Reagent-Free™ IC (RFIC™) systems. Our RFIC systems eliminate the need to manually prepare eluents, combining electrolytic eluent generation with self-regenerating suppression. By electrolytically producing high quality eluents from deionized water, RFIC systems save time and improve method performance for bromate detection. As shown in Figure 3, electrolytically generated hydroxide...

EPA Methods 317.0/326.0 & ISO Method 11206 postcolumn reaction & visible detection While suppressed conductivity is the most popular detection technique, bromate recovery will be reduced in the presence of highsalt concentrations. Since surface and ground waters can contain chloride and sulfate in excess of 50 ppm, the resolution of bromate diminish due to interference from these two salts. In order to achieve good chromatographic resolution in these circumstances, the use of postcolumn reagent with absorbance detection may be required. Thermo Scientific’s postcolumn derivatization techniques...

EPA Method 302.0—bromate analysis with 2D-IC and suppressed conductivity EPA Method 302.0 provides another strategy for bromate determination in high salt matrices— two-dimensional IC (2D-IC). 2D-IC allows the use of an RFIC system for both dimensions with conductivity detection to yield sub-ppb detection limits. The schematic for a 2D-IC system is shown in Figure 6. Automated column switching, facilitated by the Thermo Scientific Dionex ICS-5000 system and Thermo Scientific Chromeleon Chromatography Data System software, makes it possible to remove matrix ions before analysis. A high-volume...

Applications for Bromate in Water Using IC AN 208: Determination of Bromate in Bottled Mineral Water Using the CRD 300 Carbonate Removal Device uses a Dionex IonPac AS23 along with the Thermo Scientific Dionex CRD-300 Carbonate Removal Device to reduce AN 136: Determination of Inorganic Oxyhalide Disinfection Byproduct Anions and Bromide in Drinking Water Using Ion Chromatography with the Addition of a Postcolumn Reagent for background noise with a carbonate eluent to achieve less than 1 ppb MDL. Trace Bromate Analysis demonstrates the Dionex IonPac AS9-HC and AN 167: Determination of Trace Concentrations...