ARMI introduces three new certified reference materials for Inconel 690, Haynes® 282® and Incoloy 25-6Mo.
Developing new reference materials can be a time consuming process often requiring several years to complete. This means that reference material development typically lags well behind the introduction new metal alloys created to meet the needs of increasingly demanding industrial applications. This disparity creates a problem for chemists working with analytical methods such as XRF, ICP and OE, as these are comparative techniques and require reference materials to calibrate and validate.
The ColdBlock system uses infrared radiation to rapidly digest metal alloy samples and a cooling block to condense out escaping vapors minimizing the loss of volatile elements. Our preliminary results, detailed in a previous blog post (A New Sample Preparation Technique for Metal Alloys), looked promising so we are now conducting validation studies with IARM CRM’s of various alloys. This post details our validation study using CRM IARM 5I, a Grade 316 stainless steel alloy.
5 separate 0.5g aliquots of CRM IARM 5I were prepared using 20ml of aqua regia in a quartz digestion tube. The 5 digestion vessels were loaded into a 6 position ColdBlock digestion system and digested for 15 minutes at 28% power. The digested samples were diluted to a total volume of 50ml using deionized water and transferred to a centrifuge tube. 1 ml of HF was then added to each centrifuge tube to stabilize the solution. The samples were then analyzed on a Spectro Arcos ICP-OES in our laboratory. The results are detailed below. The reproducibility of each of the 5 digestions is very good, and the average values agree well with the certified values for all elements including Si and volatile elements such as As and S. We will be posting the resuts of validation studies on other alloys in the near future so subscribe to our blog to be sure you are automatically notified.
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LGC ARMI is pleased to announce the release of two new standards, IARM 282A and IARM 4F.
These reference materials are available in three different forms depending on your analytical technique; 38mm diamater x 3mm thickness for XRF, 38mm diameter x 19mm thickness for arc spark OES or as chips for analysis by ICP or AA.