Lanthanum chloride

[tmz]

his post may be of some interest:


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Lanthanum chloride, dissociates to La++ and Cl- in water.

LaCl3 + H2O(d) ===> La+++ + Cl - + H20.

The La+++ then combines with PO4.

La+++ + PO4- + H20 ===> LaPO4 , Lanthanum phosphate , a precip like CaCO3

This can only be remove mechanical and running it through submicron filters, some by skimming and some kind of sediment trap. Basically, that is what you are doing with DE and PC, as it is acting as a sediment trap and a submicron filter. So, the effluent, should hopefully, greatly reduce any getting into the tank. However, there is also the issue of La++ combining with CO3-- to give Lanthanum carbonate.

La+++ + CO3-- ===>La2(CO3)3, a precip salt like CaCO3.

This can reduce your Alk

And some La+++ will sneak through.


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Join Date: Feb 2007
Location: OKC
Posts: 765

 

[Gravesj1s]

-tmc,

The response you posted from Boomer is there a thread where it came from?I did a search and didnt find it using Lathanum Chloride.

 

[Matt_Wandell]

Well, here goes nothing. Tank water gets pumped in from an MJ1200, dwell time inside the bucket should be ~120 seconds, then flows out into the 10 micron filter sock. The lanthanum solution sits on the bucket lid and drips through a hole just above the water input. I expect the filter sock to require far less frequent rinsing this way.

 

[steelhant]

Lanthanum chloride

Has anyone dripped the Lanthanum chloride into the air input of a skimmer?

 

[Gary Majchrzak]

Has anyone dripped the Lanthanum chloride into the air input of a skimmer?

this is a bad idea.

suggestion: drip LaCl2 into the WATER input of a skimmer (and preferably drip it through a 10 micron mechanical filter before the skimmer pump intake).

How's that contraption working out for ya, Matt?

 

[NaClH2Opgh]

Has anyone dripped the Lanthanum chloride into the air input of a skimmer?

lol I tried this when I first started and my venturi gunked right up and could barely pull any air in. I had to drill the stuff out, I couldn't even scrape it out by hand.

 

[reefdogg1107]

Ran across this in the Chemistry forum:

http://www.hannachecker.com/phosphate.html

Is this acurate enough for the money at +/- .04??? Or am I better off with a test kit??

 

[tmz]

I've used the hanah low range phosphate colorimeter for hundreds of tests over a couple of years. . It's consistent and useful. The digital readout is a big plus.

The accuracy is listed in their instructions as:"+/-.04ppm + /- 4%". Some believe its whichever is greater. Many including me think it means a maximum of .04ppm variation for values over 1pm PO4 with 4% of the reading for values lower than 1.0ppm.

 

[reefdogg1107]

Thanks Tom, I don't like to rely on what I think is a certain shade of blue! So I think I will have to order one!

 

[tmz]

Good luck with it. I have the larger meter so can't really attest to this product but at $50 it appears good. Just be sure you ask if it's ok for saltwater.

 

[ILoveReefer]

Thanks Tom, I don't like to rely on what I think is a certain shade of blue! So I think I will have to order one!

You and Tom just talked me into buying one. Can't stand the color scale system.

 

[naprestsleep]

There are a couple threads in the Chemistry forum on these units. They claim they are saltwater ok, and they can be had for under $50 if you shop around.

 

[ILoveReefer]

I just called them and got the machine. Sent email, regarding Saltwater, hopefully they reply back soon.

 

[Reefski's]

i have the Hanna C200 and love it. if you push the manual test button after the automatic reading it will resample. it usually reads a little higher than the first test so there is the variability right there.

 

[ILoveReefer]

Recieved Email reply. Yes it's good for saltwater. http://www.hannachecker.com/phosphate.html

 

[radiata]

There are a couple threads in the Chemistry forum on these units. They claim they are saltwater ok, and they can be had for under $50 if you shop around.

TB Aquatics has them on "pre-order" for $40 - http://www.tbaquatics.com/shop/hanna-instruments-checker-phosphate-photometer-preorder-742.html.

 

[H20ENG]

Hi Matt,
Do you get much settling in the bucket before the sock? Just picked up some Sea Klear for the rock cooking vat system

 

[mbeast]

i've dosed sea klear for 5 days now at 10ml per day mixed with 5l of ro water, the 1st day my Po4 dropped from 0.08 to 0.06.
only thing is its not going any lower than 0.06 on the next 4 days :S

i'm using the D&D Po4 test kit and 5 micron socks for the sea klear to be dripped into.

 

[Matt_Wandell]

this is a bad idea.

suggestion: drip LaCl2 into the WATER input of a skimmer (and preferably drip it through a 10 micron mechanical filter before the skimmer pump intake).

How's that contraption working out for ya, Matt?

Good! I dilute the lanthanum into a 1g bucket and then drip it in over 12 hours. The actual output from the feed pump after head pressure ends up being about 100gph. So, in a 300g system I process the entire tank volume every 3 hours and 4 times during the 12 hour application.

One bonus of it is that at the end of the 12 hours my 10 micron filter sock has processed a total of 1200 g of water; if I dripped the lanthanum into my weir box and placed the filter sock on the sump drain it would process about 15,000 g during the same time period. So cleaning out the filter sock is much much easier.

If I were to design this from scratch with a good budget I'd create a closed loop, add the lanthanum in line with a dosing pump, let it react, and scrub the lanthanum phosphate salt particles with a 10 micron then 1 micron filter cartridge. You could do it all nice and professional with these bad boys...

 

[Matt_Wandell]

Hi Matt,
Do you get much settling in the bucket before the sock? Just picked up some Sea Klear for the rock cooking vat system

Hey Chris,

I just dump the whole 5g bucket down the drain after the application but I haven't noticed any residue. I was halfway expecting a kalk type sludge at the bottom too.... :thumbsup: