csm+b with xtra iron changing colors - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 03-10-2005, 01:17 AM Thread Starter
 
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csm+b with xtra iron changing colors

Hey guys I mixed up my solution 3 weeks ago and it was green, now its brown I dont care about the color change but Im assuming the color change means the chemical composition has changed with it. Any guess as to what happened?
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post #2 of 12 (permalink) Old 03-10-2005, 01:27 AM
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hm, my CSM+iron is brown from the beginning, never green. The brown/rust color is mainly the color of iron.


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post #3 of 12 (permalink) Old 03-10-2005, 02:50 AM
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My Flourish iron turns very dark after about 3 weeks, but seems to do the job, and I store it in the fridge. I emailed Seachem about it, no answer yet but I'm assuming it's just the nature of the beast as I don't appear to have any iron deficiencies.
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post #4 of 12 (permalink) Old 03-10-2005, 06:19 AM
 
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I would contact Greg Watson about this. Butt from what he has told me in a email. Is that the iron in the csm+b+fe is a greyish power that he mixes in it.
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post #5 of 12 (permalink) Old 03-10-2005, 06:20 AM
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I have this same thing and I noticed it turn from green to brown after just a few days when I didn't refrigerate it. I poured it out and made a new batch about a week ago and its still green. Brown may not mean that its gone "bad", but I was just being safe.

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post #6 of 12 (permalink) Old 03-10-2005, 08:45 AM
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If you wouldnt mind please let us know what you hear from Greg Watson about the color change.

Ive noticed mine just changed color today- its been green for about 2 weeks now- but today it was warmer than usual.

I usually keep mine under the tank.


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post #7 of 12 (permalink) Old 03-10-2005, 05:18 PM
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Quote:
Originally Posted by shalu
hm, my CSM+iron is brown from the beginning, never green. The brown/rust color is mainly the color of iron.
Mine's the same brown/rust color right after mixing and up to the point that I dose the tank.

Eric


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post #8 of 12 (permalink) Old 03-10-2005, 05:45 PM
 
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I read awhile ago that this is due to the oxidation state of the Fe2+ to Fe3+. I forget which color corresponds to which state. It is pH dependent.
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post #9 of 12 (permalink) Old 03-10-2005, 07:45 PM
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Mine is actually the original CSM+B and I mix it with 10%Iron chelate that I bought from Greg separately, so the CSM+B+Iron that Greg is selling now actually is green initially? Interesting.


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post #10 of 12 (permalink) Old 03-10-2005, 11:38 PM Thread Starter
 
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Quote:
Originally Posted by shalu
so the CSM+B+Iron that Greg is selling now actually is green initially?
Yep.
Rayhwong, is there a difference to plants between Fe2+ and Fe3+?
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post #11 of 12 (permalink) Old 03-10-2005, 11:48 PM
 
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Yes, if I remember correctly, Fe2+ is readily absorbed since its soluble. Fe3+ is most commonly in plant soils. It seems like the jury is still out this one. Terrestial plants can acidify the soil to turn it into Fe2+ to be absorbed by the roots.
Check out this thread.
https://www.plantedtank.net/forums/sh...ad.php?t=13076
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post #12 of 12 (permalink) Old 03-11-2005, 12:49 AM
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So does this mean that if the solution turns brown, we should pour it out and remix a fresh batch? If I understand correctly, plants can't use Fe2+ at all or as easily as Fe3+.

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