Just got my second ICP back. Looking for feedback

[Saisori]

 

[Randy Holmes-Farley Verified Community Expert]

Most things look quite good.

I see arsenic is flagged. Not sure what level is an issue or where it might be coming from. Do you use tap water?

I am not certain that iodine and fluoride are useful, but you
Might consider experimenting with dosing them, especially iodine.

 

[Saisori]

Most things look quite good.

I see arsenic is flagged. Not sure what level is an issue or where it might be coming from. Do you use tap water?

I am not certain that iodine and fluoride are useful, but you
Might consider experimenting with dosing them, especially iodine.

Using rodi. Not sure where it coming from either. Last ICP show next to no levels

 

[Christoph]

Arsenic is most often introduced by reef ceramics, sometimes also feeds. - It can be bound by GFO efficiently, but you should avoid GFO usage at the moment because of your low phosphate levels.

When comparing with previous ICPs: Arsenic is not very sensitive on ICP-OES, so might have been unnoticed, if the previous test was ICP-OES based.

 

[Saisori]

Arsenic is most often introduced by reef ceramics, sometimes also feeds. - It can be bound by GFO efficiently, but you should avoid GFO usage at the moment because of your low phosphate levels.

When comparing with previous ICPs: Arsenic is not very sensitive on ICP-OES, so might have been unnoticed, if the previous test was ICP-OES based.

Interesting. I don't use any type of GFO and there are no ceramics in the tank beside... frag plugs and I doubt I have enough to be leeching?

This was ICP MS

 

[Randy Holmes-Farley Verified Community Expert]

Interesting. I don't use any type of GFO and there are no ceramics in the tank beside... frag plugs and I doubt I have enough to be leeching?

This was ICP MS

He knows this was icp- ms. It’s from his company. He was referring to your first one, and was suggesting why it perhaps wasn’t detected then. :)

 

[Saisori]

He knows this was icp- ms. It’s from his company. He was referring to your first one, and was suggesting why it perhaps wasn’t detected then. :)

right, what I meant was both were MS

 

[Christoph]

right, what I meant was both were MS

How long was analysis #1 ago?
Any changes in feed?

I would not assume the current arsenic level is acutely problematic, however id not let it rise any further. So finding the source is recommended. Please go into your logs and check what has been changed between these two samplings.

Have a good weekend,
Christoph