Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > The Reef Chemistry Forum
Register Blogs FAQ Calendar Mark Forums Read

Notices

User Tag List

Reply
Thread Tools
Old 07/24/2019, 09:24 AM   #1
jjencek
Registered Member
 
jjencek's Avatar
 
Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 256
Help: Confused about copper test reading

About eight weeks ago I purchased a HANNA Copper LR tester. When I measured my tank, I was shocked to find out I had about 120 ppm of copper. It has varied between 100 and 400 ever since.

I have been trying to fix it, but without any success. What is confusing is that my HANNA tester measures as high as 400 ppm , but fish and all other creatures don't show signs of stress.

Furthermore, attempts of using copper absorbing media (ZEOLITE, METASORB and POLYFILTER) make no difference. I was expecting POLYFILTER to turn blue due to the copper, but it did not. It turned little brown about the same as my filter sock.

Any idea what can be going on? Can HANNA checker test positive for other reasons?


jjencek is offline   Reply With Quote
Old 07/24/2019, 01:38 PM   #2
mcgyvr
Registered Member
 
mcgyvr's Avatar
 
Join Date: Sep 2003
Location: North Carolina
Posts: 19,269
Call Hanna... Sounds like a false positive IMO..


__________________
Being blunt and having fun
Straight up INTJ
mcgyvr is online now   Reply With Quote
Old 07/24/2019, 05:02 PM   #3
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,027
My first guess is that the reagents in the kit are bad. There might be some sort of chemical interference, but I am a bit skeptical about that. I might try measuring some freshly-mixed saltwater. If that measures positive, I probably would treat about a gallon of it with a PolyFilter to see what happens.


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Old 07/25/2019, 12:35 AM   #4
jjencek
Registered Member
 
jjencek's Avatar
 
Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 256
Quote:
Originally Posted by bertoni View Post
My first guess is that the reagents in the kit are bad. There might be some sort of chemical interference, but I am a bit skeptical about that. I might try measuring some freshly-mixed saltwater. If that measures positive, I probably would treat about a gallon of it with a PolyFilter to see what happens.
I tried a new reagent - same results.

I tried fresh water mix - ZERO "copper" in that.

It is something in the tank, but still trying to figure it out.

I am also considering sending a water sample to Triton.


jjencek is offline   Reply With Quote
Old 07/25/2019, 02:27 PM   #5
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,027
Are there any invertebrates in the tank? I think that level of copper would be fatal to a fairly broad range of animals, so there might be some interference issue. I'll do some research.


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Old 07/26/2019, 01:08 AM   #6
jjencek
Registered Member
 
jjencek's Avatar
 
Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 256
Quote:
Originally Posted by bertoni View Post
Are there any invertebrates in the tank? I think that level of copper would be fatal to a fairly broad range of animals, so there might be some interference issue. I'll do some research.
Besides fish and corals I got bunch of snails, worms, and shrimps. They all seem to be fine.


jjencek is offline   Reply With Quote
Old 07/26/2019, 02:19 AM   #7
bnumair
Dr. Reef at ur service
 
bnumair's Avatar
 
Join Date: May 2009
Location: Tulsa, Ok, USA
Posts: 7,733
Blog Entries: 15
LR is in PPB so 400 ppb is 0.4 ppm which may not be lethal to fish but surely will have fatalities on inverts. if freshly made saltwater shows 0 then there is something in the tank thats adding on the copper or somehow the unit itself could be bad/off on calibration.


__________________
Water Quality: NO3 0,Phos 0,Cal 440,Alk 7.5,Mag 1300

"Reef Fast, You Crash, Reef Slow, You Pass" Mike's Reef 3:16

Current Tank Info: 350g DT,95g sump, 50g Frag tank, 4800gph return 4x Sea swirls. 6x AI Vega Color. 200# Pukani rock, dual recirculating skimmer, Biopellet, GFO Carbon rx's, Cal rx. Closed loop. 1.5hp chiller, genesis renew. Apex & RKE

Last edited by bnumair; 07/26/2019 at 02:29 AM.
bnumair is online now   Reply With Quote
Old 07/26/2019, 04:27 AM   #8
jjencek
Registered Member
 
jjencek's Avatar
 
Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 256
Quote:
Originally Posted by bnumair View Post
LR is in PPB so 400 ppb is 0.4 ppm which may not be lethal to fish but surely will have fatalities on inverts. if freshly made saltwater shows 0 then there is something in the tank thats adding on the copper or somehow the unit itself could be bad/off on calibration.
Thank you for correcting me. Yes, I meant to say PPB not PPM. So to correct my numbers ... the tank ranges from 0.1 to 0.4 ppm.


jjencek is offline   Reply With Quote
Old 07/26/2019, 05:47 PM   #9
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,027
Right, I should have notice the ppm-ppb issue, but I was assuming ppb. 400 ppm would kill everything, I think.


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Old 08/08/2019, 05:24 AM   #10
jjencek
Registered Member
 
jjencek's Avatar
 
Join Date: Dec 2016
Location: Prague, Czech Republic
Posts: 256
I got my results back from Triton ICP ... 0.0001 ppm of copper.

So it seems that Hanna Check Copper LR is FALSE POSITIVE. I know there is something in the DT that causes it, because a new RODI with RedSea salt does not show any copper.

I am opened to suggestions.

What is the best way to contact Hanna and ask?


jjencek is offline   Reply With Quote
Old 08/08/2019, 05:36 PM   #11
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 88,027
I have no idea what might be causing the testing problem. I'd try new reagents. Hanna probably has a customer service line, but I doubt that they'd know what might cause interference. I'd give them a call, anyway, to ask about a refund on the reagents.


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -6. The time now is 02:20 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014
User Alert System provided by Advanced User Tagging v3.3.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.