National Field Manual for the Collection of Water-Quality Data
TWRI Book 9
(REVISED 9/2001)
The major difficulties with equipment used to measure for alkalinity or ANC are the same as for pH measurement—refer to NFM 6.4. Particulate materials, including algae or other biota, can interfere with the stability and reproducibility of pH readings. Such difficulties normally are eliminated by filtering the sample.
When the sample has low ionic strength, or when dissolved organic compounds or noncarbonate inorganic species are present that can interfere with the titration (note color, odor, or previous chemical analysis), the Gran function determination is recommended to avoid some of these problems.
| Table
of Contents Section 6.6 |
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://water.usgs.gov/owq/FieldManual/Chapter6/section6.6/html/section6.6.6.htm
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