Citation

de Caritat, P., Cooper, M., Lech, M., McPherson, A. & Thun, C., 2009. National Geochemical Survey of Australia: Sample Preparation Manual. Record  2009/008. Geoscience Australia, Canberra.

Abstract

The National Geochemical Survey of Australia (NGSA) aims to collect samples from 1529 sites located in 1390 catchments (10% of which are sampled in duplicate) covering over 90% of Australia. At each site, two depth ranges are sampled, giving 3058 samples to be processed. Each sample results in 13 individually packaged sub-samples, meaning that 39,754 separate containers will be prepared, labelled, delivered to the laboratories or archived during the sample preparation phase of the project. Any excess fraction in the processing streams is kept for potential future use. The detailed procedures for preparing the NGSA samples in the laboratory are described with an overview of Quality Assessment/Quality Control and Operational Health and Safety measures also provided. There are three main parts to the sample preparation protocol. The first part is the Bulk Sample stream. The sample is received from the field, weighed, dried (for a minimum of 48h at 40°C) and sieved through a 4.75 mm mesh to remove any foreign material. The sample is then homogenised and split into two halves. One half is sealed and set aside for archiving for future analyses/investigations. The other half is split into sub-samples or aliquots for: 1. laser particle size analysis (LPSA), pH 1:5 (soil:water) and electrical conductivity (EC) 1:5 (soil:water) analysis; and 2. X-ray diffraction (XRD) analysis. The remainder of the bulk material is sieved through a 2mm mesh, and split into two portions (~20% and ~80%), which are processed in the following two streams. The second part is the Coarse Fraction stream. In this stream, the ~20% split of <2 mm sample prepared above is further split to prepare two aliquots for: - platinum group element (PGEs) analysis; and - gold (Au) analysis after aqua regia (AR) leach. The third part is the Fine Fraction stream. In this stream, the ~80% split of <2 mm sample prepared above is sifted using small stainless steel riffle splitters. The sample <75 um fraction is split into 5 different aliquots (splits) for different analyses. These aliquots are ranked in order of decreasing priority.
Google map showing geographic bounding box with values North bound -10.0 East bound 154.0 West bound 112.0 South bound -44.0
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For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

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Product Type/Sub Type

dataset - GA Publication - Record

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2009

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

GA Publication
Record
mineral exploration
regolith
geochemistry
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-10.0
East bound
154.0
West bound
112.0
South bound
-44.0

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

Role
distributor
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Metadata File Identifier

a05f7892-dc3d-7506-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

Metadata Date Stamp

2009-02-18

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays