SYMPOSIA PAPER Published: 01 January 1995

Quality Assurance Double-Blind Sample Applications in the Determination of Lead in Urban Dusts and Soils


X-ray fluorescence analysis (XRF), atomic absorption spectroscopy (AAS), and inductively coupled plasma — atomic emission spectroscopy (ICP-AES) were used for the measurement of lead in samples for the Urban Soil Lead Abatement Demonstration Project (USLADP).

In addition to the usual quality control measures, soil and dust audit samples were introduced into each laboratory's sample input system such that the persons doing sample preparation or analytical determinations were unaware that the samples were for quality assessment. The samples were introduced as unknowns along with other USLADP project soil and dust samples with their identification known only to the laboratory quality assurance officer.

Acceptance of lead analysis data for individual groups of samples, without qualification, was based partially on whether the values for lead in the double-blind audit samples were within value limits calculated from the statistical treatment of multi-laboratory test data.

Author Information

Vincent, HA
Boyer, DM
Lockheed Environmental Systems and Technologies, Las Vegas, NV
Elias, RW
Environmental Criteria and Assessment Office, MD-52, USEPA, Research Triangle Park, NC
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Developed by Committee: D18
Pages: 355–369
DOI: 10.1520/STP12986S
ISBN-EB: 978-0-8031-5296-0
ISBN-13: 978-0-8031-1884-3