National Geochemical Survey of Australia: Data Quality Assessment
Dataset Identification:
Resource Abstract:
Several quality control measures were taken during the project. These included: - Central provision of sampling equipment
and sample bags to all field teams - Randomised sample identification scheme so that samples were presented to the laboratories
in a sequence unrelated to the order in which they were collected (as much as practically feasible) - Prevention of contamination
in the field and in the lab - Prevention of sample mix-up in the field and in the lab - Field duplicates: every 10th site,
a field duplicate sample was collected to help quantify total (sampling + analytical) precision (not identified as such to
the lab) - Certified Reference Materials (CRMs) TILL-1, TILL-2 (Natural Resources Canada) were run with every batch on GA's
XRF & ICP-MS to help quantify analytical precision and bias - Laboratory duplicates (splits), internal project standards (MRIS,
WRIS, ORIS, MRIS2, WRIS2), exchanged project standards (GEMAS-Ap, GEMAS-Gr from EuroGeoSurveys; SoNE-1 from United States
Geological Survey), and international CRMs (TILL-1, TILL-3, LKSD-1, STSD-3 from Natural Resources Canada) were covertly inserted
in the analytical suites for in-house and external analyses to help quantify analytical precision and bias (not identified
as such to the lab) - Internal project standard (GRIS) for pH 1:5, EC 1:5 and grain size measurements (not identified as such
to the lab) In addition to the above measures, the analytical labs applied their own QA/QC procedures, including running CRMs
and/or internal standards, replicating digests and/or analysis, and analysis of blanks. The present report uses some of the
above data to quantitatively assess the quality of the NGSA data, which allows a quality statement to be made about the NGSA
data.
Citation
Title National Geochemical Survey of Australia: Data Quality Assessment
Metadata standard for this record:
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
standard version:
1.1
Metadata record identifier:
a49c6749-d84d-640c-e044-00144fdd4fa6
Metadata record format is ISO19139-2 XML (MI_Metadata)