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- Q4653301 subject Q7191052.
- Q4653301 subject Q8857950.
- Q4653301 abstract "APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, is a color standard named for the American Public Health Association and defined by ASTM D1209. It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications. APHA color is a color scale sometimes referred to as a “yellowness index” that is used to assess the quality of liquids that are clear to yellowish in color.It is similar to the Hazen color test, to which it is sometimes incorrectly referred. The Hazen color test uses a Pt/Co solution and was developed for water treatment facilities where the Color of water could be used as a measure of concentration of dissolved and particulate material. Slight discoloration is measured in Hazen units (HU) Impurities can be deeply colored as well, for instance dissolved organic compounds called tannins can result in dark brown colors.".
- Q4653301 wikiPageExternalLink D1209.htm.
- Q4653301 wikiPageExternalLink an-1001-measuring-the-water-whiteness-of-liquids-using-the-apha-scale.pdf.
- Q4653301 wikiPageExternalLink apha-pt-co-hazen-color.
- Q4653301 wikiPageExternalLink pt-co_apha.html.
- Q4653301 wikiPageExternalLink apha2.
- Q4653301 wikiPageExternalLink page42.html.
- Q4653301 wikiPageExternalLink aphahazen.cfm.
- Q4653301 wikiPageExternalLink an11_96br3.pdf.
- Q4653301 wikiPageExternalLink index.php?id=14778.
- Q4653301 wikiPageExternalLink apha-color-scale.
- Q4653301 wikiPageWikiLink Q100649.
- Q4653301 wikiPageWikiLink Q174211.
- Q4653301 wikiPageWikiLink Q336191.
- Q4653301 wikiPageWikiLink Q4731678.
- Q4653301 wikiPageWikiLink Q4744758.
- Q4653301 wikiPageWikiLink Q5148636.
- Q4653301 wikiPageWikiLink Q621977.
- Q4653301 wikiPageWikiLink Q7191052.
- Q4653301 wikiPageWikiLink Q8857950.
- Q4653301 wikiPageWikiLink Q906261.
- Q4653301 comment "APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, is a color standard named for the American Public Health Association and defined by ASTM D1209. It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications.".
- Q4653301 label "APHA color".