ASTM Industrial Test Methods for visual and instrumental APHA Colour Scale

APHA/Pt-Co/Hazen visual and instrumental methods

FAQ: “Does HunterLab have any documentation to show that the UltraScan VIS is compliant with ASTM 1209. One of our customers is having a problem regarding the method. Their client is using the manual visual method for performing the ASTM 1209 colour test method whereas they use the UltraScan VIS. Can you explain the difference?”There are many industrial methods that reference the APHA/Pt-Co/Hazen colour scale but two of the best are:

• ASTM D1209 Standard Test Method for Colour of Clear Liquids (Platinum Cobalt Scale) defines the visual APHA/Pt-Co/Hazen colour scale for yellowness of clear liquids.
• ASTM D5386 Standard Test Method for Colour of Liquids Using Tristimulus Colorimetry defines the instrumental APHA/Pt-Co/Hazen colour scale for yellowness of clear liquids that directly correlates to the visual ASTM D1209 method.

ASTM – American Society of Testing and Materials, West Conshohocken, PA USA www.astm.org

The instrumental method provides an objective quantification of the APHA Colour Scale with much better precision than the visual method, particularly for near colorless samples.

When APHA/Pt-Co Colour is reported, you may see references to the “ASTM D1209” visual method when an instrument is being used, or occasionally “ASTM D1209/D5386” which is more correct.

Our statement would be that HunterLab sphere instruments measure visual ASTM D1209 APHA/Pt-Co Colour scale in accordance with the instrumental ASTM D5386 method.

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