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12/04/2018, 03:25 PM | #1 |
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Arsenic levels
Was wanting to know if 0.044 ppm of Arsenic level was dangerously high.
I'm running GFO, And also changed salt brand as well. Any recommendations Last edited by ReefTankHunter; 12/04/2018 at 03:55 PM. |
12/04/2018, 04:40 PM | #2 | |
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Ron Jones Current Tank Info: 55g mixed reef |
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12/04/2018, 07:05 PM | #3 |
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ICP, test for arsenic, and po4 is .01.
But have plenty of HA. |
12/04/2018, 10:49 PM | #4 |
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Sorry to hear that you have the HA. I asked about ICP because if you were using the colorimetric method for arsenic/arsenate, phosphate gives you a false positive. Personally I would not worry too much about 44 ppb of arsenic but I would try to eliminate the source if possible. The average clean seawater concentration is 1.7 ppb. Ron
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Ron Jones Current Tank Info: 55g mixed reef Last edited by Jonesrd1; 12/04/2018 at 11:07 PM. Reason: Forgetfulness |
12/05/2018, 06:30 AM | #5 |
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Thanks Ron.
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02/17/2019, 03:35 PM | #6 | |
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Arsenic
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A recent ICP test showed .035 ppm arsenic for my tank, and I had 0.04 ppm phosphorus. This wasn't triton but was some place in Colorado (Coral Vue) with which i'm not to impressed / pleased. I used triton about a year earlier and no arsenic showed. So false positive are not uncommon? What are other sources for arsenic in the tank - magnesium supplements? |
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02/17/2019, 04:15 PM | #7 |
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False values seem fairly common with such testing. The trace elements are hard to test accurately at a price point we can afford as hobbyists. I wouldn't worry very much about the arsenic reading. I might check my RO/DI setup to make sure it was functioning properly. Arsenic can show up in some water supply systems.
Most supplements could end up with a bit of arsenic in them, but I can't think of one that is more likely to cause a problem. A problem batch could show up in most products, but I hope that's unlikely.
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Jonathan Bertoni |
02/17/2019, 04:31 PM | #8 | |
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Ron Jones Current Tank Info: 55g mixed reef |
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02/17/2019, 05:59 PM | #9 |
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I am actually going to run some samples through a local university to see if there is any real concern.
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02/17/2019, 08:41 PM | #10 |
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A local college might be able to do the tests properly. I don't know much about what's involved, so I can't add anything useful.
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Jonathan Bertoni |
02/18/2019, 05:48 PM | #11 | |
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02/18/2019, 08:54 PM | #12 | |
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Ron Jones Current Tank Info: 55g mixed reef |
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02/21/2019, 08:17 AM | #13 | |
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03/04/2019, 06:27 PM | #14 |
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ICP Test Results
I got my ICP test results back. I did 4 tests from the following sources: kitchen sink, top-off (RO/DI) water, reef tank and reef tank with added mag supplement. [it was only around $100 for the 4 tests, not bad]
I read that mag supplements can be a source of arsenic. I use Fritz supplement which is a newer player in the market but a company that LFS switched to and recommends. Given this, I took one of the samples (each sample was about 10 oz) from my reef tank and added about 3 ml of Fritz's mag supp). Results of interest - RO/DI Sample - less than .002 mg/l of As Reef Tank - .066 mg/l of As Reef Tank w/Mag Supp - .075 mg/l of As I'm not saying this conclusively shows that the supplement is the source of the arsenic but... |
03/04/2019, 11:11 PM | #15 |
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The other possibility is the salt mix.
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03/05/2019, 02:20 PM | #16 |
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03/05/2019, 04:07 PM | #17 |
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Yes, but those numbers are quite close in terms of expected accuracy, in my opinion.
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03/05/2019, 04:12 PM | #18 | |
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Quote:
They were effectively the same sample but one just had additional magnesium supplement. The other thing that was surprising was that the copper reading was higher with the sample that included the supplement. I plan on switching salts and will run an ICP test for each of the salt mixes using fresh RO/DI for each mix. Maybe that will also narrow things. Sent from my iPhone using Tapatalk |
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