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Evaluation of pH testing methods for sulfidic mine waste
Citation
Noble, TL and Lottermoser, BG and Parbhakar-Fox, A, Evaluation of pH testing methods for sulfidic mine waste, Mine Water and the Environment, 35, (3) pp. 318-331. ISSN 1025-9112 (2016) [Refereed Article]
Copyright Statement
Copyright 2015 Springer-Verlag
DOI: doi:10.1007/s10230-015-0356-2
Abstract
Environmental assessment of solid mine waste is required throughout the life of a mine. This has driven the need for tools and practices to understand the current state of net acidity in mine wastes. Rinse and paste pH tests are commonly used in the initial screening of waste to provide a preliminary evaluation of its current net acidity. Such pH tests are particularly useful for assessing the chemistry of first flush waters draining sulfidic rocks and wastes. In this study, we compared nine different pH tests (rinse and paste pH tests as well as soil tests of the International Organization for Standardization ISO 10390:2005; American Society for Testing and Materials ASTM D4972-01 2007; Standards Australia AS4969.2-2008), using three different sulfidic rock samples and the acid–base accounting standard KZK-1. We observed significant variability in measured pH for the same samples using the different test methods. We show that different rinse and paste pH methods using different grain sizes and extraction solutions can result in different risk classification for ARD assessments. We recommend carrying out pH measurements using 0.01 M CaCl2 solution, which results in more rapid, reproducible, and precise analyses than using deionised water.
Item Details
Item Type: | Refereed Article |
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Keywords: | acidity, testing, rinse pH, paste pH, risk classification, acid rock drainage, mine waste, prediction, static tests |
Research Division: | Earth Sciences |
Research Group: | Geochemistry |
Research Field: | Exploration geochemistry |
Objective Division: | Environmental Management |
Objective Group: | Terrestrial systems and management |
Objective Field: | Evaluation, allocation, and impacts of land use |
UTAS Author: | Noble, TL (Dr Taryn Noble) |
UTAS Author: | Parbhakar-Fox, A (Dr Anita Parbhakar-Fox) |
ID Code: | 104704 |
Year Published: | 2016 (online first 2015) |
Web of Science® Times Cited: | 11 |
Deposited By: | Centre for Ore Deposit Research - CODES CoE |
Deposited On: | 2015-11-18 |
Last Modified: | 2017-12-06 |
Downloads: | 0 |
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