ICP Question - high arsinic levels

[Centerline]

Just got back a ICP on a relatively new tank. Noted high arsenic, silicone and aluminum levels. The silicone could be explained by my use of it on all the unions and valves in the tank. Arsenic and aluminum? Total mystery. The tank in question has a BUNCH of pipe and new equipment so I wasn't expecting perfect results but I am a little mystified by the arsenic and where it could have come from. The tank and equipment were flushed multiple times (6 full fills and 12 hour runs at 85 degrees) before adding salt water and the ICP test was ran after the tank had been up and cycling for 8 weeks. One other thing that is a bit unconventional and perhaps worth considering is that my rockwork relied heavily on epoxy, fiberglass and carbon fiber. I have used this method many time with no problems but who knows. Once the rockwork was complete I allowed it to cure in the full Florida sun for 6 weeks. The epoxy manufacturer (West System) advised me that a week cure time would probably be fine but I was in no rush. The tank is using Red Sea Coral Pro Salt. The RODI filters are newish with TDS reporting at 0 ppm. Any ideas?

 

[chipmunkofdoom2]

The test is for silicon, not silicone. Silicon is more frequently present as silicates and does not come from silicone, and is probably not a concern at the levels reported.

Arsenic can easily be removed by some GFO. Granular ferric oxide was originally used in the waste water treatment industry to remove arsenic from water during treatment. The aquarium hobby borrowed it as a way to reduce phosphates since phosphates have a similar structure to arsenic.

Aluminum at those levels might not be problematic per this post by Randy Holmes-Farley.

To keep these things out of the tank, you should be checking your system for rusted metal. You also need to keep up on your DI resin, as a lot of ions tend to get removed by DI resin.

 

[Centerline]

The test is for silicon, not silicone. Silicon is more frequently present as silicates and does not come from silicone, and is probably not a concern at the levels reported.

Arsenic can easily be removed by some GFO. Granular ferric oxide was originally used in the waste water treatment industry to remove arsenic from water during treatment. The aquarium hobby borrowed it as a way to reduce phosphates since phosphates have a similar structure to arsenic.

Aluminum at those levels might not be problematic per this post by Randy Holmes-Farley.

To keep these things out of the tank, you should be checking your system for rusted metal. You also need to keep up on your DI resin, as a lot of ions tend to get removed by DI resin.

Obviously need to pay more attention to silicon vrs silicone LOL. Ill start running GFO and retest in a week or two. Thank you for taking the time to look at the post.