Acid-base accounting is a predictive geochemical method used to quantify the net acid-generating or acid-neutralizing potential of geological or waste materials, particularly in the context of acid mine drainage or acid sulfate soils. It typically involves determining total sulfur or sulfide sulfur concentrations as a proxy for potential acidity, and measuring carbonate or other neutralizing mineral contents to estimate neutralization potential. These parameters are combined, often as net acid producing potential (NAPP) and net neutralization potential (NNP), to classify materials as potentially acid-forming, non-acid-forming, or uncertain, thereby informing management, remediation, and regulatory decisions.
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