| 词条 | Pt/Co scale |
| 释义 |
The Platinum-Cobalt Scale (Pt/Co scale or Apha-Hazen Scale ) is a color scale that was introduced in 1892 by chemist Allen Hazen (1869–1930). The index was developed as a way to evaluate pollution levels in waste water. It has since expanded to a common method of comparison of the intensity of yellow-tinted samples. It is specific to the color yellow and is based on dilutions of a 500 ppm platinum cobalt solution. The colour produced by one milligram of platinum cobalt in one litre of dissolved water is fixed as one unit of colour in platinum-cobalt scale. The ASTM has detailed description and procedures in ASTM Designation D1209, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)".[1][2][3] See also
References1. ^{{cite web|url=http://www.hunterlab.com/appnotes/an11_96br3.pdf|title=FAQ - How to Measure Color of a Sample & Use An Index - HunterLab|first=|last=HunterLab|website=www.hunterlab.com}} {{DEFAULTSORT:Pt Co Scale}}{{Hydrology-stub}}{{chemistry-stub}}2. ^Designation D1209-00, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)," ASTM International, West Conshohocken, PA, 2000 3. ^Hazen, A., "The Measurement of the Colors of Natural Waters," American Chemist Journal (18:264), 1896 7 : Dimensionless numbers of chemistry|Environmental engineering|Liquid water|Water and the environment|Water chemistry|Water pollution|Color scales |
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