Copper levels - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 05-07-2010, 03:03 AM Thread Starter
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Copper levels

What would be considered high levels for Mexican Dwarf Crayfish. My water tested at .044 mg/L. I'm wondering if I should buy copper absorbents before I get any crayfish.


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post #2 of 10 (permalink) Old 05-07-2010, 03:20 AM
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.044 mg/L should be ok. It gets a bit dangerous when it's .3+ mg/L if my memory is right.


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post #3 of 10 (permalink) Old 05-07-2010, 05:01 AM Thread Starter
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Ok that's good to know. I've had problems with dwarf crays before, and I figured it was copper, because everything else seemed fine.


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post #4 of 10 (permalink) Old 05-07-2010, 06:21 AM
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If you are really that worried run some cupri sorb.
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post #5 of 10 (permalink) Old 05-07-2010, 03:37 PM
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Add plants, they remove copper and most all metals quite well.

Remember, dose is Concentration X Time.

Adding Copper is fine as long as the time is small and the concentration is not too large. Organic matter, soils etc also bind and chelate metals which plants can still use and OM reduces their toxicity.

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post #6 of 10 (permalink) Old 05-07-2010, 11:29 PM Thread Starter
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It's fully planted and I don't add any copper. Been that way for 2 years. It could be chelated, but I have no way to tell.


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post #7 of 10 (permalink) Old 05-07-2010, 11:38 PM
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Quote:
Originally Posted by spinycheek View Post
It's fully planted and I don't add any copper. Been that way for 2 years. It could be chelated, but I have no way to tell.
Copper test measure total copper, not chelated forms which are far less toxic, but more persistent. I'd be suspicious about any readings at ppb ranges.
Ask what the error is and the high low readings, methods etc.

I think this is not very much at all.

Plenty of people yell and carry on about copper when other basics are not even considered, and there's never any controls or test done. I would not add high levels say for algae control(bad for plants as well), but the typical amounts in CMS+B and most every trade etc are fine.

I bred shrimp quite well.......so .......


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post #8 of 10 (permalink) Old 05-08-2010, 05:16 AM Thread Starter
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I don't rely on the last digit either. Spectrophotometric tests have their limits, but the last digit gives me an idea about whether to round up or down. I wish I knew what killed what my previous crayfish.......oh well.

Thanks for the help!


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post #9 of 10 (permalink) Old 05-08-2010, 05:42 AM
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Oh, you did the test yourself. Try getting the Cu++ parameter from your waterworks report off the internet. I'd assume they have more sophisticated instruments, or at least calibrated.

Crustaceans have copper based blood so a small amount is needed.


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post #10 of 10 (permalink) Old 05-08-2010, 06:38 AM Thread Starter
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I actually work at a water plant, so I can run any test my municipality would. Granted, my lab is far from being Federally certified, but I can still get somewhat accurate numbers. There is a state mandated copper test that is run annually, but the sample is collected after 6 hours of contact with copper piping (homeowners are asked not to use their faucets for 6 hours). This test is given to a certified lab, but only represents the worst case scenario being stale in the copper pipes, I use my sink a lot, so my copper would be considerably lower.

With that being said, the copper in my tap water (When I run the test) is around .05 mg/L usually.


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