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A New Method for Testing Metals in Oils: Calibrating with Hybrid Aqueous/Organic Solvent Standards
Presented by Inorganic Ventures Technical Director Mike Booth. The analysis of metals in oils by ICP-OES has traditionally depended on the use of organometallic certified reference materials (CRMs). Inorganic Ventures (IV) has investigated a new approach to instrument calibration for testing metals in oils using aqueous CRMs diluted in an organic solvent. This new organic solvent provides miscibility for both the inorganic metals standards and the oil samples. Aqueous inorganic Co and Y were added as internal standards to the organic solvent, making the dilution of standards and samples an easy, one-step process. A calibration method was validated using the hybrid aqueous/organic CRMs by analyzing both traditional organometallic CRMs and NIST SRM 1085c as samples vs. IV’s hybrid aqueous/organic CRMs. The benefits of using these hybrid aqueous/organic CRMs will be discussed; including the ability to analyze for elements in oils that are currently difficult or not possible to test, such as the addition of sulfur to the calibration standards.
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