Summary #
Manganese is a metal frequently found in AMD that can affect water quality and treatment system design. This page explains manganese sources, behavior, and measurement in AMD-impacted streams.
Magnesium, a common metallic metal found in the earth’s crust, is of particular importance in water pollution. Manganese can be found in a variety of forms and can be present in a variety of compounds and complexes with organic compounds. Like iron, it’s a naturally occurring metal that often becomes a problem after local mining activities cease.
Samples are analyzed for magnesium in a lab using standard procedures. Results are recorded in mg/L and compared to the State Drinking Water Standard, which is 0.05mg/L.
Magnesium precipitates out of water when it comes in contact with oxygen, turning the channel black, however the pH must raise above 10 before it will precipitate out. The affects of elevated levels of manganese on aquatic life is difficult to determine because it is often associated with other naturally occurring, yet detrimental metals. Research has concluded that the less common precipitated form of manganese is more toxic then the dissolved form. As it settles to the channel bottom it, like iron and aluminum, destroys the aquatic ecosystem by covering rocks and filling cracks where insects live and fish lay their eggs, lowering macroinvertebrate diversity.
Sources/Links (as provided in the source text):
Related Pages #
- Developing a Monitoring Plan — Structuring your monitoring program
- Removing Metals (Chemistry Concepts)
- Ferrous and Ferric Iron (Chemistry Fundamentals)
Source and Last Reviewed #
Source: AMR Clearinghouse (amrclearinghouse.org). Migrated to AML-Connect. Last Reviewed: 2026-03-13.
[Admin note: Some external links in this article may be outdated. Verify before relying on them. Flag dead links for removal or replacement.]
Tags: metals, monitoring, sampling, amd
