SWAN Analytische: SWAN AMI Turbiwell: Turbidity of water by Turbidimeter
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Official Method Name
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Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter |
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Current Revision
| August 10, 2009 |
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Media
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WATER |
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Instrumentation
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Turbidity |
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Method Subcategory
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Physical |
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Method Source
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Citation
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SWAN, 2009, Continuous Measurement of Turbidity Using a SWAN AMI Turbiwell Turbidimeter: SWAN Analytische Instrumente AG, Switzerland. |
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Brief Method Summary
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The method is based upon a comparison of the intensity of light scattered by the sample under defined conditions with the intensity of light scattered by a standard reference suspension. The higher the intensity of scattered light, the higher the turbidity. The instrumentation is installed to read turbidity continuously. |
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Scope and Application
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This method is applicable to drinking, surface, saline, ground and effluent water samples, domestic and industrial, in the range from 0 to 40 Nephelometric Turbidity Units (NTU). It meets the requirements for compliance monitoring and reporting as demanded under the Safe Drinking Water Act (SDWA). |
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Applicable Concentration Range
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0 to 40 Nephelometric Turbidity Units (NTU). |
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Interferences
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The presence of floating debris and coarse sediments which settle out rapidly will give low readings of turbidity. Finely divided air bubbles will cause high readings. These interferences can be eliminated by using a degasser. The presence of true color, that is color of water which is due to dissolved substances that absorb light, will cause turbidities to be low, although this effect is generally not significant with drinking water. Light-absorbing materials such as activated carbon in significant concentrations can cause low readings. |
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Quality Control Requirements
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The minimum requirements of this program consist of an initial demonstration of laboratory capability and analysis of laboratory reagent blanks and other solutions as a continuing check on performance. The linear calibration range and of the instrument must be initially determined and periodically verified. |
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Sample Handling
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. |
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Maximum Holding Time
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Relative Cost
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Unknown |
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Sample Preparation Methods
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