Particle Settling Rate and pH
How is the particle settling influenced by pH in natural water?
Hmm, natural water, hmmm.
What are we talking about "natural water"?
I will assume you are asking about ground water.
Here is an interesting article about the pH of water from the US Geological
This article addresses many issues about water and pH. I hope you find it
useful and helpful in answering your question. Among the articles points is
"The pH of water determines the solubility (amount that can be dissolved in
the water) and biological availability (amount that can be utilized by
aquatic life) of chemical constituents such as nutrients (phosphorus,
nitrogen, and carbon) and heavy metals (lead, copper, cadmium, etc.). For
example, in addition to affecting how much and what form of phosphorus is
most abundant in the water, pH also determines whether aquatic life can use
it. In the case of heavy metals, the degree to which they are soluble
determines their toxicity. Metals tend to be more toxic at lower pH because
they are more soluble. (Source: A Citizen's Guide to Understanding and
Monitoring Lakes and Streams)"
I hope this answers your question.
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Update: June 2012