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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: zzzzz on February 27, 2005, 04:41:36 AM

Title: Eriochrome Black T
Post by: zzzzz on February 27, 2005, 04:41:36 AM

where does the T from the indicator Eriochrome Black T come from?

Title: Re:Eriochrome Black T
Post by: Borek on February 27, 2005, 06:59:44 AM

Therea er at least four Eriochrome blacks - A, B, R and T. They are very similar compounds. all have analytical uses. Capital letters are used to differentiate between them; perhaps they are connected with the compund structure but I am only guessing here.

Title: Re:Eriochrome Black T
Post by: ATMyller on February 28, 2005, 03:03:55 AM

Eriochrome black T is a compelx aromatic compound used as a metal indicator, printing pigment and in water hardness analysis.
It's blue in protonated form and red in complex form. It's known for ages so it's probably extracted from some plant.