Chromium Speciation: Speciate different components over x-y

[Arindam2975]

Hi,

I am trying to plot different Cr species over x-y diagram. I would loke to plot pH on the x-axis and Total Chromium concentration on the y-axis. From the analysis, I have Cr (Total)= 14 mg/l, Cr+++= 8.5 mg/l, and Cr++++++= 5.5 mg/l and pH= 7.2. Could you please help me in plotting these data?

 

Thanks,

Ari

[Tom Meuzelaar]

Hi,

I am trying to plot different Cr species over x-y diagram. I would loke to plot pH on the x-axis and Total Chromium concentration on the y-axis. From the analysis, I have Cr (Total)= 14 mg/l, Cr+++= 8.5 mg/l, and Cr++++++= 5.5 mg/l and pH= 7.2. Could you please help me in plotting these data?

 

Thanks,

Ari

 

Hi Ari:

 

The attached is close to what you are asking for- this is an Eh-pH diagram for Chromium, assuming that Cr6+ is not in equilibrium with the other Cr redox species.

 

To plot total Chromium on the x-axis, you'll want to need a range of Cr+++ activity values as input.

 

I hope that helps,

 

Tom Meuzelaar

RockWare, Inc.