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 …

The color is measured as tristimulus values of percent transmitted light by a sample using deionized water as a blank. Then these tristimulus values are converted to platinum-cobalt …

For samples where the color is different from Pt-Co standards, several different standards and color scales are used such as: ADMI Color (American Dye Manufacturer’s Institute), Gardner …

The APHA color scale, also known as the Platinum-Cobalt (Pt/Co) or Hazen scale, serves as a “yellowness index.” It compares the intensity of yellow-tinted samples to assess the quality of …

The APHA/Pt-Co/Hazen Color Index is useful for measuring the trace yellowness associated with the degree of contamination or processing quality of transparent liquid samples that are near …

Several different color “scales” are utilized in measuring color in different products or industries. Some common examples are ASTM color, Saybolt, and APHA (aka Platinum-Cobalt, or Hazen).

Also referred to as a “yellowness index”, the APHA color scale is a common method of com-parison of the intensity of yellow-tinted samples to assess the quality of liquids that are clear to …

To evaluate pollution levels in wastewater and for drinking water control, a specific color scale is used, called Pt/Co scale, APHA-Hazen Scale, or APHA Scale. Generally it is described in …

APHA color, also known as the Platinum-Cobalt (Pt/Co) or Hazen scale, is a standardized visual and instrumental method for quantifying the yellowness or color intensity in clear to light yellow …

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).