Certification of Three NIST Renewal Soil Standard Reference Materials for Element Content

Abstract

Element Concentrations). These materials have been used worldwide for quality assurance by a variety of laboratories involved in the determination of major, minor, and trace element content of soils and similar materials. Stocks of these original SRMs were depleted by 2008, and replacement SRMs were produced which became available in 2009. This paper describes, in detail, the process for the renewal of these three soil SRMs including soil collection and preparation methods, homogeneity assessment, experimental design, and the element analysis and data evaluation methods used to provide certified, reference, and information mass fraction values for 44 to 48 major, minor, and trace element constituents. For each SRM, the acid-extractable amount content of selected elements was determined by participants in the US Environmental Protection Agency's Contract Laboratory Program, and summaries of those method-specific results are included as addenda to the Certificates of Analysis.

Divergent Patterns and Spatial Heterogeneity of Soil Nutrients in a Complex and Dynamic Savanna Landscape

“…Concentrations of all analyzed elements are reported as mg/kg. Elemental recovery rates for both reference materials are shown in Table S2 of Supporting Information , and are comparable to those reported for other NIST materials digested using similar methods (Mackey et al., 2010). Recovery rates of a few elements from soil samples (e.g.…”

“…Concentrations of all analyzed elements are reported as mg/kg. Elemental recovery rates for both reference materials are shown in Table S2 of Supporting Information S1, and are comparable to those reported for other NIST materials digested using similar methods (Mackey et al, 2010). Recovery rates of a few elements from soil samples (e.g., Al, K, Cr, V) were lower than 70% due to the fact that the acid digestion method may not fully solubilize the mineral lattices where some proportion of these elements may reside (Mackey et al, 2010).…”

“…Recovery rates of a few elements from soil samples (e.g. , Al, K, Cr, V) were lower than 70% due to the fact that the acid digestion method may not fully solubilize the mineral lattices where some proportion of these elements may reside (Mackey et al., 2010).…”

Synchrotron Radiation Research and Analysis of the Particulate Matter in Deep Ice Cores: An Overview of the Technical Challenges

“…For each experimental run, blank filters were prepared using the same methods as the dust samples, and SR-XRF data were collected to validate the experimental run and ensure that during transport or storage, no significant contamination occurred. Also, a calibration batch of reference standards prepared with comparable amounts of NIST reference soil (NIST 2709a, San Juaquin soil [16]) was regularly measured.…”