Lanthanum Chloride

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by Joe Batt, Feb 3, 2018.

  1. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    Is Lanthanum Chloride the same as Lanthanum Chloride heptahydrate? I have found a chemical called Phos-Out but not Sea-Klear which is what people usually use.

    (from what I can tell a heptahydrate is a particle that contains seven molecules of water, so sounds ok to me but I am no chemist)
     
    Last edited: Feb 3, 2018

  2. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    Screen Shot 2018-02-03 at 14.45.05.jpg
    From my understanding, it looks like Lanthanum Chloride and seven molecules of water. If that's correct it should be fine to use for removing Po4 from
    dry rocks during the cycle (no fish or inverts just salt water and a small amount of the Lanthanum chloride heptahydrate.)
     
  3. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    The heptahydrate is a fine form of lanthanum chloride to use. :)
     
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  4. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    Thanks Randy. It was the heptahydrate that threw me off but just looks like water to me....my school days are long behind me though :)
     
  5. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    Yep. Just water. It does alter the amount of lanthanum per gram of solid product, but no one is dosing it that critically (or if they are, they are probably wasting effort being ultra precise). :)
     
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  6. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    I'm just using it to remove any Po4 from dry rock after an acid and bleach bath, so the dose isn't super critical and it is such strong stuff anyway!
     
  7. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    That's definitely a good application for it and having excess is no concern. :)
     
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  8. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    One last quick question. Can you use the lanthanum whilst cycling the rocks, or will it cause problems with the nitrogen cycle?
     
  9. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    Good question. Nitrifying bacteria do need a source of phosphate, and I presume it is possible to drive it too low, but I've never seen any tests that described if excessively low phosphate might slow cycling.
     
  10. Joe Batt

    Joe Batt Active Member Build Thread Contributor

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    Maybe then it would be better to let the rock cycle and the nitrifying bacteria grow using the phosphate that leaches into the water. After the cycle is complete then run the lanthanum to get the levels down, it shouldn't kill the bacteria I hope, but remove the phosphates.
     
  11. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    Folks usually blast the rock with lanthanum first. :)
     
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