Chemical Stability and Compatibility - Element ratios between standards and samples for soils and seeds
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It’s generally a good rule of thumb to vary the element ratios in your standards to match those found in your samples. This ensures that the samples fall within the linear calibration range of the standards, and also helps account for matrix effects for samples measured at relatively high total-dissolved solid contents. As for the elements you are interested in, we can certainly recommend a few options for a multi-element standard. The first consideration is your preferred matrix, and the second is the upper limit of concentrations that you’d like in the standard(s). Of the elements listed, Hg, and to a lesser extent Sn, will constrain possible options (see http://www.inorganicventures.com/mercury-chemical-stability for more information). If you would like a HNO3 matrix, there are fewer options than if an HCl matrix is acceptable. If you could comment on the preferred matrix and the upper limits for the element concentrations, then we can discuss the possibilities for a multi-element standard. Based upon your criteria we may recommend more than one solution to ensure stability, and we can provide guidance on how to mix standards together to create stable, everyday working solutions. For some general information on element compatibility and the guidelines we follow when creating multi-element standards more information is available on our interactive periodic table (http://www.inorganicventures.com/periodic-table). |