What is APHA unit?
Science. The scale for APHA color goes from 0 to 500 in units of parts per million of platinum cobalt to water. Zero on this scale represents distilled water, or what is more commonly called white water. APHA standards can be used for both visual comparison and instrumental measurements.
What is measured in platinum cobalt scale?
The Platinum-Cobalt (Pt-Co) color scale measures the “yellowness” of a liquid and is well suited for quality control and contamination detection. The Pt‑Co scale is used to evaluate pollution levels in waste water and for drinking water quality control and regulation.
Is APHA the same as PT CO?
“APHA”, “Pt-Co” and “Hazen” are three names for the same color scale. The name preferred in ASTM D1209 and ISO 6271 is the “Platinum-Cobalt Color” or Pt-Co, but “APHA” is name in most common use in industry. When used, the term “Hazen Units” (HU) may be found in product specifications.
What are color units?
unit of colour A unit of true colour (UTC), or a platinum-cobalt unit, refers to the quantity of colour revealed under specified sampling conditions, by a control solution containing 1 mg of platinum per litre.
What is APHA value?
APHA color, also referred to as Hazen or Platinum Cobalt (Pt/Co) scale, is a single-number color scale with a range from 0 (achromatic clear) to 500 (light yellow). It was originally developed as a visual color assessment of water quality by comparing with dilutions of a platinum-cobalt stock solution.
What is platinum-cobalt unit?
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 colour produced by one milligram of platinum cobalt dissolved in one liter of water is fixed as one unit of colour in platinum-cobalt scale.
What is Platinum Cobalt unit?
What is Platinum Cobalt method?
The platinum-cobalt method of measuring color is the standard method, the unit of color being that produced by 1 mg platinum/L in the form of the chloroplatinate ion. It is not applicable to most highly colored industrial wastewaters.
What do you understand by platinum-cobalt unit?
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.