What is Hexavalent chromium (CrVI)?
Hexavalent chromium (CrVI) is a naturally occurring toxic composition of chromium, a known hazard to both public health and the environment. As with every hazard, it is extremely important to achieve efficient and accurate data when analyzing this analyte in the laboratory.
Our South Richmond Environmental laboratory has been working towards a new methodology to support this analysis of CrVI via Ion Chromatography. We can now accept samples for SW7199 and EPA 218 and use this new method to achieve lower reporting limits and more accurate results.
Ion Chromatography provides precise detection.
Ion Chromatography is used to separate Cr(VI) ions from all the other ions present in a given sample through the use of both an eluent and an analytical column. Once passed through the column, both UV detection and atomic absorption spectroscopy are used to measure the absorption of CrVI at a specific wavelength.
The preparation of water samples for CrVI through the method of SW7199 and EPA 218 is relatively simple. The samples are filtered through a 0.45 µm filter. The pH of the filtrate is then adjusted to a range of 9.0-9.5. The samples are then placed on the Ion Chromatograph for analysis. Soil samples go through a longer digestion process to ensure CrVI is recovered during analysis.
Methods EPA 218 & SW-846 7199 are trusted standards for Chromium Analysis.
Methods SW7199 and EPA 218 provide a robust and validated protocol for determining chromium concentrations. By employing ion chromatography and spectrophotometric detection, it offers high accuracy and precision in quantifying both total hexavalent chromium (Cr(VI)) and total recoverable chromium (Cr). This ensures reliable and consistent results, enabling accurate monitoring of chromium levels in environmental samples.
The methodology’s sensitivity enables the detection and quantification of low levels of chromium, even in complex sample matrices. By utilizing selective chromatographic separation and post-column derivatization, Method SW7199 minimizes interference from other compounds, ensuring the measurement specifically targets chromium species of interest. This enhances the reliability and specificity of the analysis.
Understanding CrVI Risks and the importance of accurate analysis.
It is important to know the amount of hexavalent chromium (CrVI) in a sample of water or soil because it is a toxic and carcinogenic substance that can pose a significant risk to human health and the environment. Therefore, it is necessary to monitor CrVI levels in drinking water sources and industrial effluents to prevent exposure and minimize health risks.
Hexavalent Chromium can also impact the environment because it is highly mobile and can easily leach into groundwater or contaminate the soil. CrVI-contaminated soil can impact the growth of plants and the overall health of ecosystems. Additionally, it can enter aquatic ecosystems, where it can harm fish and other aquatic organisms, as well as affect the quality of drinking water sources.
EPA 218 & SW-846 7199 provide a reliable and systematic approach for analyzing Hexavalent Chromium in water and wastewater samples, which is crucial for monitoring and regulating chromium contamination levels in environmental and industrial settings.
In closing…
Enthalpy Labs advances hexavalent chromium analysis through enhanced methodology and ion chromatography. With trusted standards like EPA 218 and SW-846 7199, we ensure precise quantification of hexavalent chromium in water and wastewater samples, prioritizing human health and environmental protection through diligent monitoring and regulation.
Sarah Endsley
Laboratory Manager
Sarah is a laboratory manager at Enthalpy Analytical, joining Enthalpy in 2018 and holding roles of laboratory technician and project manager prior to her current position. During her time at Enthalpy, Sarah has used her data review and time management skills to manage high profile clients and projects and is now putting this same knowledge to work managing her onsite and off-site labs today. Sarah is proficient in several benchtop analyses, metals analysis via ICP-MS, and has successfully managed some complex projects with several customizations and has trained new project managers and team members on efficient methods of project management. Sarah studied Chemistry at Lake Forest College in Illinois, and graduated with a Bachelors Degree in Chemistry with a focus in Environmental Science and a minor in English Literature.
