Trace Level Analysis of Perchlorate and Bromate in Various Water Matrices using Suppressed Ion Chromatography
Poster Mar 05, 2014
Dr. Jay Gandhi, DR. Stuart Procter
Perchlorate salts are used as “rocket fuel” in electroplating and other industries; yet, in 1999 (C&EN article) it was scientifically proven to inhibit the human thyroid gland’s absorption of iodine — which, in turn, may cause thyroid-related diseases. Perchlorate detection/analysis in varying water matrices can be a challenge. How do we overcome the obstacles?
Bromide is ubiquitously found in drinking water. It is introduced into source water either by contact with bromide-containing soils or seawater having a high bromide content. Bromide converts into bromate during water disinfection, for example by ozonation. Bromate can also enter drinking water when sodium hypochlorite is used as disinfectant, as it is a common impurity in sodium hypochlorite production. The International Agency for the Research of Cancer has determined that bromate is a possible carcinogen. Therefore, monitoring of bromate and its precursor bromide in drinking water is required.
While much research has been done to develop methods to analyze for bromate and bromide including several Environmental Protection Agency (EPA) methods, most of this work requires specialized instrumentation such as two-dimensional ion chromatography, expensive sample preparation or post-column reactions techniques.
This work describes a method for determining the concentration of bromate and bromide ions at ppb levels in drinking water using a simple isocratic IC with loop injection. Bottled water and tap water samples were used to validate the method. Spiked water samples were used to verify quantification.
Using Elemental Analysis For Discrimination Of Pinot Noir Wines From Six Different Districts In An AvaPoster
The determination of geographical origin of wine is gaining increased interest by researchers and federal agencies around the world, partially due to increased fraud with regards to place of origin labelling. For wine, multi-elemental profiling of macro, micro, and trace elements has been proposed for determination of authenticity. Commercial wines from different wineries in 5 different neighborhoods within one AVA show characteristic elemental fingerprints. Macro, micro and trace elements as well as elemental ratios contribute to the observed separation, indicating the involvement of multiple factors and underlying mechanisms, including location and soil composition, elemental uptake by vine and rootstock, viticulture and nutrient management, water sources, and small differences in the different wineries.READ MORE
Fast arsenic speciation analysis of wines and rice with LC-ICP-QQQPoster
This method was designed in response to recent and proposed food standards, both international and national, that limit inorganic arsenic rather than total, organic, or individual arsenic species such as arsenite (AsIII) and arsenate (AsV). Analysis time is 10x faster than the current FDA regulatory method, increasing sample throughput, avoided spectral interferences and dramatically increased sensitivity. Validation data from two laboratories demonstrate the method’s accuracy and reproducibility of both wine and rice matrices in a single analytical batch.READ MORE
Elemental profiles of whiskies allow differentiation by type and region by inductively coupled plasma –optical emission spectroscopy (ICP-OES)Poster
The analysis of the elemental composition of whiskies provides a host of important information including sample origin and understanding how different whiskey styles are caused by processing equipment and raw materials. Preliminary data analysis of the whiskies showed that element compositions could possibly be used to differentiate samples based on age, type, and region.READ MORE