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aria-label="breadcrumb separator">/</span> <span class="breadcrumb-current-title">Safeguarding Our Water: Another Step Forward in the Battle Against Hexavalent Chromium</span></div></div></header><div class="site-inner"><div class="content-sidebar-wrap"><main class="content"><article class="post-17840 post type-post status-publish format-standard has-post-thumbnail category-ion-chromatography category-water-analysis tag-hexavalent-chromium tag-ion-chromatography tag-water-analysis entry" aria-label="Safeguarding Our Water: Another Step Forward in the Battle Against Hexavalent Chromium"><header class="entry-header"><h1 class="entry-title">Safeguarding Our Water: Another Step Forward in the Battle Against Hexavalent Chromium</h1> <span class="post-info-author"> By <a href="https://www.thermofisher.com/blog/analyteguru/tf-author/rachel-davis/" title="Posts by Rachel Davis" rel="author">Rachel Davis, Product Marketing Specialist, IC/SP, Thermo Fisher Scientific</a> </span> <span class="post-info-date"> 06.06.2024 </span> </header><div class="entry-content"> <p>In the ongoing fight for clean drinking water, there are many contaminants that need to be monitored. One such contaminant is hexavalent chromium, also known as chromium-6 or Cr(VI). This hazardous substance infiltrates drinking water through various industrial processes and poses significant health risks, including cancer and damage to vital organs. Until recently, drinking water regulations primarily focused on total chromium, which includes both chromium-3 (an essential nutrient) and chromium-6. However, California took a crucial step in addressing this issue <a href="https://apnews.com/article/hexavalent-chromium-water-standards-pollution-brockovich-c5cb0121337648dd5b95a58f0b00aa7e" target="_blank" rel="noreferrer noopener">by announcing the nation’s first rule that specifically targets chromium-6</a>. This new limit, which is scheduled to be implemented on Oct. 1, 2024, requires a limit of 10 µg/L hexavalent chromium. While this limit is still above the public health goal of 0.02 µg/L, it marks a positive stride toward safeguarding our communities.</p> <div class="wp-block-image"> <figure class="alignright size-large is-resized"><img decoding="async" width="1024" height="786" src="https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Water-1200-1024x786.jpg" alt="" class="wp-image-17844" style="width:479px;height:auto" srcset="https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Water-1200-1024x786.jpg 1024w, https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Water-1200-300x230.jpg 300w, https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Water-1200-768x589.jpg 768w, https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Water-1200.jpg 1200w" sizes="(max-width: 1024px) 100vw, 1024px" /></figure></div> <h3 class="wp-block-heading" id="h-advanced-testing-methods-needed"><strong>Advanced testing methods needed</strong></h3> <p>To meet these new requirements for hexavalent chromium, advanced testing methods are necessary. Fortunately, a highly effective method that targets hexavalent chromium has already been developed. US EPA Method 218.7, which was developed through a direct collaboration with Thermo Fisher Scientific and the EPA, provides guidelines for utilizing ion chromatography (IC) with a variable wavelength detector to accurately measure hexavalent chromium levels in drinking water. This direct injection IC method is highly accurate and can detect hexavalent chromium as low as 0.003 µg/L, significantly below the California public health goal of 0.02 µg/L.</p> <div class="wp-block-image"> <figure class="alignright size-full is-resized"><img decoding="async" width="633" height="777" src="https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Chrom-6-chromatogram.png" alt="" class="wp-image-17845" style="width:452px;height:auto" srcset="https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Chrom-6-chromatogram.png 633w, https://www.thermofisher.com/blog/analyteguru/wp-content/uploads/sites/25/2024/06/Chrom-6-chromatogram-244x300.png 244w" sizes="(max-width: 633px) 100vw, 633px" /><figcaption class="wp-element-caption">Figure 1. </figcaption></figure></div> <p>Following US EPA Method 218.7, the Thermo Scientific Dionex Inuvion IC system and Thermo Scientific Dionex AS-DV autosampler with the Thermo Scientific Dionex™ IonPac AS7 column set can achieve a method detection limit of 0.0056 ug/L hexavalent chromium (AP002416). For higher sample throughput, the Thermo Scientific Dionex ICS-6000 HPIC system and Thermo Scientific Dionex AS-AP autosampler with the same column set can also be utilized (AU179). This setup offers the same methodology with increased productivity because of the dual-channel configuration. The Figure 1 demonstrates this method in A) DI water blank, B) 0.007 ug/L, and C) Sunnyvale, CA tap water.</p> <h3 class="wp-block-heading" id="h-direct-injection-ic-helps-ensure-regulatory-compliance"><strong>Direct injection IC helps ensure regulatory compliance</strong></h3> <p>With the establishment of a new drinking water limit for hexavalent chromium, California is taking a significant step in safeguarding public health. Advanced testing methods, such as direct injection IC, provide the necessary tools to accurately measure hexavalent chromium levels in drinking water. By employing these techniques, laboratories can ensure compliance with regulatory standards and contribute to the ongoing battle against hexavalent chromium contamination. Together, we can continue working toward cleaner and safer drinking water for all.</p> <h3 class="wp-block-heading" id="h-interested-in-learning-more"><strong>Interested in learning more?</strong></h3> <p>Download our application notes to learn how you can implement this method using Thermo Scientific Dionex ion chromatography systems to perform sensitive determination of Cr(VI) in drinking water.</p> <ul class="wp-block-list"> <li>Dionex Inuvion IC system method: <a href="https://assets.thermofisher.com/TFS-Assets/CMD/Application-Notes/ap-002416-ic-dionex-inuvion-chromate-drinking-water-ap002416-na-en.pdf" target="_blank" rel="noreferrer noopener">Sensitive determinations of hexavalent chromium in drinking water using a compact IC system (AP002416)</a></li> <li>Dionex ICS-6000 HPIC system method: <a href="https://assets.thermofisher.com/TFS-Assets/CMD/Application-Notes/AU-179-IC-Hexavalent-Chromium-Drinking-Water-AU70415-EN.pdf" target="_blank" rel="noreferrer noopener">Sensitive determination of hexavalent chromium in drinking water (AU179)</a></li> </ul> <h3 class="wp-block-heading" id="h-related-information"><strong>Related information</strong></h3> <ul class="wp-block-list"> <li>Blog: <a href="https://www.thermofisher.com/blog/analyteguru/practical-analysis-solutions-to-enhance-water-quality-for-a-safer-future/" target="_blank" rel="noreferrer noopener">Practical Analysis Solutions to Enhance Water Quality for a Safer Future</a></li> <li>Blog: <a href="https://www.thermofisher.com/blog/analyteguru/water-management-for-industrial-and-chemical-manufacturers-to-enhance-sustainability/" target="_blank" rel="noreferrer noopener">Water Management for Industrial and Chemical Manufacturers to Enhance Sustainability and Efficiency</a></li> <li>Blog: <a href="https://www.thermofisher.com/blog/analyteguru/the-vital-role-of-ic-in-ensuring-water-quality/" target="_blank" rel="noreferrer noopener">The Vital Role of IC in Ensuring Water Quality</a></li> </ul> <p>Visit our <a href="https://www.linkedin.com/showcase/chromatography-&-mass-spectrometry/posts/?feedView=all" target="_blank" rel="noreferrer noopener">LinkedIn page</a> #IonChromatography #WaterAnalysis #HexavalentChromium</p> </div></article><section class="author-box"><h4 class="author-box-title">Rachel Davis</h4><div class="author-box-content" itemprop="description">Rachel Davis is a Product Marketing Specialist for the Ion Chromatography and Sample Preparation (IC/SP) business unit at Thermo Fisher Scientific. Drawing from her background in chemical engineering, marketing, and customer success, Rachel supports the digital strategy and execution of marketing initiatives to better understand customer needs and provide solutions to their analytical challenges. </div></section><div class="adjacent-entry-pagination pagination"><div class="pagination-previous alignleft"><i class="fa fa-icon fa-chevron-left"></i> <a href="https://www.thermofisher.com/blog/analyteguru/exploring-lithium-ion-battery-anode-degradation-with-ic-ms-ms/" rel="prev">Exploring Lithium-Ion Battery Anode Degradation Using IC-MS/MS</a></div><div class="pagination-next alignright"><a href="https://www.thermofisher.com/blog/analyteguru/why-you-need-a-verification-class-mass-spectrometer/" rel="next">Why You Need a Verification-class Mass Spectrometer</a> <i class="fa fa-icon fa-chevron-right"></i></div></div></main></div></div><footer class="site-footer"><div class="wrap"><div class="creds"><p class="footer-links"><a href="https://corporate.thermofisher.com/en/footer/privacy-statement.html" target="_blank" rel="noopener noreferrer">Privacy Statement</a><a href="https://corporate.thermofisher.com/en/footer/terms-and-conditions.html" target="_blank" rel="noopener noreferrer">Terms & Conditions</a><a href="/blog/locations/">Locations</a><a href="/blog/sitemap/">Sitemap</a></p><p>© 2025 <a href="https://www.thermofisher.com">Thermo Fisher Scientific</a>. 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