When I analyse colour of a water sample using HACH make DR5000 spectrophotometer, I get the reading -3 Pt-Co units. What does that mean?

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Rafik Karaman

Dear Sathishkumar,

-3Pt-Co unit refers to Platinum-Cobalt Standard Method. For more on this topic, please see attached file (read the 4 pages on Cobalt).

Hoping this will be helpful,

Rafik

Iñigo Legórburu

The measurement of water color using a chloro-Pt complex of Co (Hazen units, APHA units) was developed in XIX century to reflect the presence in water of humic substances of natural origine, its color being similar to the one of the Co compound.