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Evaluation of net acid generation pH as a single indicator for acid forming potential of rocks using geochemical properties

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Abstract

The main purpose of this research was to evaluate the geochemical properties of rocks for a single indicator of acid-forming potential. The indicators, such as net acid generation (NAG), NAG pH and total S, were applied to 312 rock samples of various geological characteristics. Additional indicators, such as a Modified NAG pH, paste pH and available acid neutralizing capacity (ANC), were applied to 22 selected samples. Among them, NAG pH was considered the most plausible single indicator in evaluating acid-forming potential, as it is simple to measure, widely applicable to various samples and can be used to estimate the NAG value. The acid-forming potential of 287 samples (92% of samples examined in this research) was classified as either non-acid forming (NAF) or potentially acid forming (PAF) by NAG pH, with an NAF criteria of <3.21 and PAF of >4.52. The NAG pH was also a good estimate of the risk of short-term acid release when combined with paste pH information. However, application of NAG pH to coal mine wastes, with high organic carbon contents, produced erroneous results due to the generation of organic acid during the NAG test. In this research, a Modified NAG pH was assessed as an alternative to NAG pH in such situations.

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Acknowledgments

This work was funded by the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources (KIGAM).

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Authors and Affiliations

  1. Geologic Environment Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea

    Chamteut Oh, Giljae Yim & Youngwook Cheong

  2. Climate Change Mitigation and Sustainability Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, South Korea

    Sangwoo Ji

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  1. Chamteut Oh
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  3. Giljae Yim
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Correspondence to Sangwoo Ji.

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Oh, C., Ji, S., Yim, G. et al. Evaluation of net acid generation pH as a single indicator for acid forming potential of rocks using geochemical properties. Environ Monit Assess 189, 165 (2017). https://doi.org/10.1007/s10661-017-5869-7

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