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Search took 0.09 seconds. Search: Posts Made By: jfinch
Forum: The Reef Chemistry Forum 02/01/2006, 08:31 PM
Replies: 11
Views: 398
Posted By jfinch
Only 14,907 posts... he's got a long way to go,...

Only 14,907 posts... he's got a long way to go, Randy! :lol:

Welcome Bertoni!
Forum: The Reef Chemistry Forum 10/19/2005, 09:16 AM
Replies: 25
Views: 524
Posted By jfinch
http://www.alken-murray.com/Sulfur.jpg No...

http://www.alken-murray.com/Sulfur.jpg

No one ever talks about the sulfur cycle in a marine aquarium environment. How it all interconnects. When sulfur is brought up it almost always centers...
Forum: The Reef Chemistry Forum 10/18/2005, 11:35 PM
Replies: 25
Views: 524
Posted By jfinch
Will you discuss the sulfur cycle?

Will you discuss the sulfur cycle?
Forum: The Reef Chemistry Forum 09/26/2005, 06:40 PM
Replies: 50
Views: 977
Posted By jfinch
but for all practical purposes is an "error" of...

but for all practical purposes is an "error" of .002 or a range of 1.024 to 1.026 significant

Hi Hobster. My opinion is that an error of 0.002 might be significant for the instrument doing the...
Forum: The Reef Chemistry Forum 09/25/2005, 12:39 AM
Replies: 10
Views: 531
Posted By jfinch
something that tends to draw me to seachem I...

something that tends to draw me to seachem

I too really like this about Seachem.
Forum: The Reef Chemistry Forum 09/24/2005, 10:49 AM
Replies: 52
Views: 1,546
Posted By jfinch
I just saw that explaination on your calculator. ...

I just saw that explaination on your calculator. I need to pay more attention to the "fine print" :lol:

Thanks for the calculator!
Forum: The Reef Chemistry Forum 09/19/2005, 05:12 PM
Replies: 52
Views: 1,546
Posted By jfinch
ESV's site shows: "1.5 mL will raise one gallon...

ESV's site shows: "1.5 mL will raise one gallon of aquarium water by 15 ppm" does that not conver to 1L/100gallon/100ppm?

Yup.

Hey jdeck1, your reef calculator appears to be wrong wrt ESV Mag.
Forum: The Reef Chemistry Forum 09/19/2005, 04:35 PM
Replies: 52
Views: 1,546
Posted By jfinch
jdeck1's math...

jdeck1's math (http://home.comcast.net/~jdieck1/chem_calc3.html) shows 666 ml of ESV Magnesium to raise 100 gal by 100 ppm. That comes out to $3.88 to raise 100 gal by 100 ppm. That's much closer...
Forum: The Reef Chemistry Forum 09/04/2005, 11:55 AM
Replies: 35
Views: 1,955
Posted By jfinch
The fact that you found consistency is important,...

The fact that you found consistency is important, imo. Dr Ron came to the opposite conclusion based on his testing, http://www.reefkeeping.com/issues/2002-04/rs/feature/index.php . He blamed the...
Forum: The Reef Chemistry Forum 09/03/2005, 07:00 PM
Replies: 35
Views: 1,955
Posted By jfinch
Does anybody care to interpret. What I got...

Does anybody care to interpret.

What I got from the results is pretty much what Lee said. If you pick one method as a baseline (I picked the AAS results) and look at the difference between each...
Forum: The Reef Chemistry Forum 09/02/2005, 05:01 PM
Replies: 35
Views: 1,955
Posted By jfinch
Interesting work Lee! Hope you don't mind but I...

Interesting work Lee! Hope you don't mind but I charted the data in the attached worksheet. I'm an engineer... I need graphs :lol: I didn't graph the fresh water samples and I threw out the...
Forum: The Lounge 08/29/2005, 10:46 PM
Replies: 15
Views: 306
Posted By jfinch
It's of the form: y=ae^(bx) Take the...

It's of the form: y=ae^(bx)

Take the natural log of each side: ln(y) = ln(a) + bx

Rearrange: ln(y) = bx + ln(a)

So take the natural log of each of the y data and plot it vs. x and do...
Forum: The Reef Chemistry Forum 08/29/2005, 06:55 PM
Replies: 22
Views: 499
Posted By jfinch
Why the disconnect between reality and...

Why the disconnect between reality and recommendations?

I really don't really know. But personally I don't think many people understand the difference between specific gravity and density or even...
Forum: The Reef Chemistry Forum 08/29/2005, 10:00 AM
Replies: 22
Views: 499
Posted By jfinch
IMO, Is making the salt water up at 1.023...

IMO,

Is making the salt water up at 1.023 sp. gr. at 75F so wrong?

There's nothing "wrong" with that unless you want to mimic natural seawater you'd find around tropical reefs. That water has...
Forum: The Reef Chemistry Forum 08/26/2005, 03:59 PM
Replies: 225
Views: 7,921
Posted By jfinch
Spiking after doing the titration. It is not...

Spiking after doing the titration. It is not perfect but very close to it.

Dang! That's why I'm an engineer :lol: (ashamed that idea hadn't occured to me before ). :thumbsup:
Forum: The Reef Chemistry Forum 08/26/2005, 02:53 PM
Replies: 225
Views: 7,921
Posted By jfinch
Spiking to say 300 or 400 ppm will work not 50...

Spiking to say 300 or 400 ppm will work not 50 ppm because the resolution of kits is not better than approx 10 ppm.

I wondered about the resolution of the kits seeing that small difference. But...
Forum: The Reef Chemistry Forum 08/26/2005, 02:33 PM
Replies: 225
Views: 7,921
Posted By jfinch
What's wrong with mixing up a gallon of IO. ...

What's wrong with mixing up a gallon of IO. Splitting it and spiking half with a known amount of dried ACS grade calcium chloride to increase this sample's calcium content by 50 ppm. Now test both...
Forum: The Reef Chemistry Forum 08/26/2005, 10:58 AM
Replies: 12
Views: 296
Posted By jfinch
FWIW, it is not a petrochemical company but...

FWIW, it is not a petrochemical company but consisted of several divsions

I've only worked in the petrochemical/refining industries, so my exposure to them was/is limited to the coatings,...
Forum: The Reef Chemistry Forum 08/26/2005, 09:38 AM
Replies: 12
Views: 296
Posted By jfinch
IIRC the first synthesis of an organic compoud...

IIRC the first synthesis of an organic compoud was urea and done by IIRC Wöhler about 150 years ago.

Hey, I synthesize this every morning at about 5:30 am. :lol:

Did he live in Holland?
...
Forum: The Reef Chemistry Forum 08/25/2005, 05:07 PM
Replies: 21
Views: 744
Posted By jfinch
Which is why meq/l makes perfect sense.

Which is why meq/l makes perfect sense.
Forum: The Reef Chemistry Forum 08/24/2005, 05:21 PM
Replies: 21
Views: 744
Posted By jfinch
For some time there has been discussion on this...

For some time there has been discussion on this board of using a single unit in reefing. I favor parts per million as it is fairly uniform and straightforward.

Spoken just like an old...
Forum: The Reef Chemistry Forum 08/23/2005, 02:12 PM
Replies: 225
Views: 7,921
Posted By jfinch
Can you provide details on the two kits you're...

Can you provide details on the two kits you're using? (Expiration date(s); reagent lots; etc.).

I'll get the info on the Salifert kit when I get home.

The Hach method uses Hach calcium...
Forum: The Reef Chemistry Forum 08/23/2005, 11:08 AM
Replies: 225
Views: 7,921
Posted By jfinch
Lee, have you tried using the 5 ml syringe that...

Lee, have you tried using the 5 ml syringe that comes with the Salifert kit to draw the 1 ml water sample for your Seachem kit? Maybe the sample pipette that came with your Seachem kit is off...
Forum: The Reef Chemistry Forum 07/28/2005, 09:07 AM
Replies: 999
Views: 108,271
Posted By jfinch
Seems to be a common thread amongst chemistry...

Seems to be a common thread amongst chemistry moderators :lol:
Forum: The Reef Chemistry Forum 07/22/2005, 10:02 AM
Replies: 2
Views: 217
Posted By jfinch
If you don't have ready access to the stuff,...

If you don't have ready access to the stuff, you'll save money by just buying a good kit such as the salifert, imo.

But, yes you can buy all those things at a chemical supply store (check your...
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