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Old 08/12/2018, 11:42 AM   #1
smartwater101
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Exclamation Found several pieces of metal in new sand. Removed + 90% WC. Tests still show TIN

This is a refresh of a tank that sat empty for 2+ years. 70g. Tropic Marine Pro salt. CaribSea florida crushed coral (bag was purchased two years ago but just opened)

All the power heads are new. Pumps are clean and there are no rusted screws and all metal brackets are coated with plastidip. No GFO.

Test from a month ago.

Analysis
97 g/l

Setpoint
0,1 g/l

Deviation
96.90

After this Triton test, I originally thought the new PVC was the culprit (but still crazy high) Then ran a strong magnet through the sandbed I found several pieces of metal in the tank! Enough to fill a quarter of a shotglass.

I did a 90% water change after removing these pieces and a month later I'm still seeing tin in the latest test.

Analysis
23 g/l

Setpoint
0,1 g/l

Deviation
22.9
23 g/l 0,1 g/l 22.9

So I'm at a loss at this point. Confused about how it got there in the first place and wondering why I still have elevated levels. And I don't see any stand-alone tin test kits.

Thoughts on how to proceed?




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Old 08/12/2018, 03:16 PM   #2
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What kind of metal was this? I'm a bit skeptical about the tin. I don't think that tin is alloyed very often with iron.


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Old 08/12/2018, 03:21 PM   #3
smartwater101
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Quote:
Originally Posted by bertoni View Post
What kind of metal was this? I'm a bit skeptical about the tin. I don't think that tin is alloyed very often with iron.
No idea. It was little broken up shards.


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Old 08/12/2018, 03:28 PM   #4
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pics?


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Old 08/12/2018, 04:14 PM   #5
bertoni
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I don't particularly trust the tin reading. If you want to check the level, you could try enclabs.com, but it'll be pricey. If there is lead, a PolyFilter might help, but I'm not sure I'd bother unless animals were having problems.


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Old 08/12/2018, 05:00 PM   #6
smartwater101
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Quote:
Originally Posted by bertoni View Post
I don't particularly trust the tin reading.
Well to be fair, only one of my tanks has tin show up in testing and only one of my tanks actually had pieces of metal in it.


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Old 08/12/2018, 05:15 PM   #7
bertoni
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That's true, but I'm still a bit skeptical. I don't know of any alloys of tin and iron. Tin might show up in solder, though. The reading could be showing some form of interference, which is an issue with ICPP.


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Old 08/14/2018, 05:10 AM   #8
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Quote:
Originally Posted by bertoni View Post
That's true, but I'm still a bit skeptical. I don't know of any alloys of tin and iron. Tin might show up in solder, though. The reading could be showing some form of interference, which is an issue with ICPP.
Agreed that tin contamination in the metallic objects in the sand bed is unlikely....
Tin plated or tin alloyed ferrous metal (magnetic) is unlikely/uncommon..


But.. Guess what float glass is made on.. Yes.. a molten bed of tin..
Guess what glass has thats often overlooked by tank manufacturers.. Yep.. a tin residue side and a non-tin side..
Guess whats often overlooked in tank building.. Yep.. identifying the tin side with UV light,etc.. and putting that side out..

High tin levels in ICP testing is quite common and IMO very likely from the glass and the tin residue left on it from manufacturing..


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Old 08/15/2018, 11:07 AM   #9
smartwater101
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Originally Posted by mcgyvr View Post

High tin levels in ICP testing is quite common and IMO very likely from the glass and the tin residue left on it from manufacturing..
I use acrylic.

I'm still not understanding what there is to be sceptical about. Only one tank showed tin (two months in a row) and only one tank had metal fragments found.


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Old 08/15/2018, 11:25 AM   #10
bertoni
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We see tin readings and various other elements showing up in odd quantities. There's some evidence that their testing doesn't work for trace elements:

http://packedhead.net/2015/triton-la...ater-standard/

Also, I'm not sure why the metal that you found would have tin in it. It's possible, though. If you're worried, a PolyFilter might help, at least over time.


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