Guidelines for Using Hydrochloric Acid in ICP-MS Analysis Released by US EPA

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Memorandum Regarding Use of Hydrochloric Acid (HCl) in Digests for Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) Analysis | Hazardous Waste Test Methods / SW-846 | US EPA
The United States Environmental Protection Agency (EPA) has released a memorandum regarding the use of hydrochloric acid (HCl) in digests for inductively coupled plasma-mass spectrometry (ICP-MS) analysis. The memorandum was issued to clarify which version of Method 3050 to use based on the analysis technique. The use of this memo is to ensure accurate and reliable results for the analysis.

Method 3050, Acid Digestion of Sediments, Sludges, and Soils, is commonly used in environmental laboratories for the analysis of samples. This method involves the use of hydrochloric acid (HCl) as an initial digestion step, followed by the addition of nitric acid (HNO3) and hydrofluoric acid (HF). The resulting digested sample is then used for ICP-MS analysis.

The memo states that the original Method 3050 should be used when analyzing samples using quadrupole ICP-MS. This version of the method is commonly used in laboratories and is well-established. However, when analyzing samples using high-resolution ICP-MS, the modified Method 3050B should be used. The modified version of the method adds a step of cooling the digest solution before the addition of nitric acid and hydrofluoric acid. This cooling step is necessary to prevent memory effects in high-resolution ICP-MS analysis.

The memo also recommends specific HCl concentrations be used based on the analysis technique being used. For quadrupole ICP-MS, the HCl concentration should be 14M, while for high-resolution ICP-MS, it should be 12M. These concentrations have been found to provide optimal results without causing instrument interferences or memory effects in the analysis.

This clarification from the EPA is especially important for laboratories conducting environmental analysis. Accurate and reliable results are necessary for compliance with environmental regulations and protection of human health and the environment. Inaccurate results can lead to incorrect remediation and monitoring decisions, potentially causing harm to the environment and public health.

The memo received praise from environmental organizations and industry groups alike. The American Society for Testing and Materials (ASTM) stated that the memo provides important guidance to environmental laboratories and will improve the quality of environmental testing. The memo was also welcomed by the industry group, the Environmental Industry Association (EIA), which stated that it will make it easier for laboratories to analyze samples accurately and reliably.

Company name, a leading provider of environmental testing services, has welcomed this clarification from the EPA. Accurate and reliable results are crucial for our clients and the environment, said a company spokesperson. We welcome any guidance that will improve the quality of environmental testing and help us provide the best service to our clients.

In conclusion, this memo from the EPA clarifies the use of hydrochloric acid in digests for ICP-MS analysis and ensures accurate and reliable results for environmental analysis. The use of specific versions of Method 3050 and specific HCl concentrations based on the analysis technique will improve the quality of environmental testing and protect human health and the environment. The memo received praise from environmental organizations and industry groups alike, making it easier for laboratories to analyze samples accurately and reliably.

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