USGS-NWQL: I-1586: pH in Water by Electrometry Using a Glass-Electrode
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Official Method Name
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pH in Water by Electrometry Using a Glass-Electrode |
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Current Revision
| 1985 |
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Media
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WATER |
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Instrumentation
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pH Meter |
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Method Subcategory
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Inorganic |
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Method Source
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Citation
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Methods for the Determination of Inorganic Substances in Water and Fluvial Sediments, Techniques of Water-Resources Investigations of the United States Geological Survey, Book 5, Chapter A1 Edited by Marvin J. Fishman and Linda C. Friedman |
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Brief Method Summary
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This method involves pH-meter operation and may be automated with commercially available instrumentation. |
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Scope and Application
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This method may be used to determine the pH of any natural or treated water and any industrial or other wastewater. |
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Applicable Concentration Range
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None given. |
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Interferences
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(1) Sodium error may bias results at pH > 10 unless a "low sodium error" electrode is used. (2) Coatings of oily material can impair electrode. (3) Temperature effects. |
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Quality Control Requirements
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Calibrate instrument using calibration standards (CAL); quality control samples (QCS); and laboratory blanks (LB) analyzed at a minimum of 1 for every 10 samples. |
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Sample Handling
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Container Description: 125 mL polyethylene bottle. Treatment and Handling: Use unfiltered sample to rinse bottle. Max holding time: 180 days. |
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Maximum Holding Time
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180 days |
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Relative Cost
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Less than $50 |
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Sample Preparation Methods
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