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Optimization of partial extraction chemistry for buffered acetate and hydroxylamine leaches

I. J. Dalrymple, D. R. Cohen and S. G. Gatehouse
Optimization of partial extraction chemistry for buffered acetate and hydroxylamine leaches
Geochemistry - Exploration, Environment, Analysis (August 2005) 5 (3): 279-285

Abstract

The reaction conditions chosen for most partial geochemical extractions remain largely unjustified in terms of optimizing their ability to isolate element signatures related to the effects of mineralization. This study demonstrates the use of central composite designs to study the effects of variation in temperature, pH and reagent concentrations on metal extraction for a buffered acetate leach and a hydroxylamine leach. These designs have been used on nine soil samples from a traverse over porphyry Cu-Au mineralization in central NSW, Australia. For both leaches, metal extractability varies significantly with reaction conditions and the strongest responses to mineralization are generally provided under a very restricted range of digestion conditions. The optimum extraction conditions at Mandamah for the acetate leach are the low pH of the acetate buffer (3.76) and a high acetate concentration at any temperature. The optimum conditions at Mandamah for the hydroxylamine leach are pH = 0, T = 100 degrees C and a moderate to high hydroxylamine concentration (although not for its ability to reduce metal oxides).


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 5
Serial Issue: 3
Title: Optimization of partial extraction chemistry for buffered acetate and hydroxylamine leaches
Affiliation: University of New South Wales, School of Biological Earth, and Environmental Sciences, Australia
Pages: 279-285
Published: 200508
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
References: 13
Accession Number: 2005-062620
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Source Medium: WWW
S37°30'00" - S28°15'00", E141°00'00" - E153°30'00"
Secondary Affiliation: CSIRO Exploration and Mining, AUS, AustraliaHellman & Schofield Company, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200538
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