AWT results
- Thread starter DrBegalke
- Start date
<a href=showthread.php?s=&postid=11211425#post11211425 target=_blank>Originally posted</a> by Boomer
Nah Don, you can't test things like Mo with a probe. They say they are using spectrophotometry, auto-titration, and specialized ion specific probes, aka ISE as you mentioned
Now that you have blown the whistle, in my mind anyway, I'm thinkin more like they went out and bought a HACH Spectrophotometer, like a DR 5000 or DR 2800, sup's it with a auto titrator (maybe for Mg++, Ca++ and ALK) and some ISE's and then gave a couple of lab rat a jodAnd YES, thinkin that reealllly bothers me. There are lots of issues with Spectro's if you do not know what you are doing, same with ISE probes. And all of this would explain so many funny results. Not a very BRIGHT idea to have the same address :lol:
They came across, like they where already a lab and this AWT was just a side business. I no longer have any/much hope for their test procedures.......BUSTED>>>>>>>>>>>
Hopefully they will step up to the plate and show that I'm wrong. I think your giving them to much credit. This does not seem like a operation that has made that sort of capital investment. I think we both know supply and demand isnt high enough to justify that high of an investment for aquarium water alone. I could justify a sideline to a existing lab. But then I would expect an existing lab even if all they did was well water samples would know how to get accurate SW results.
Ive got some oil samples going to spectra tomorrow. I'll talk to them about an aquarium testing package if there is actually that many people wanting lab testing.
Don
water samples would know how to get accurate SW results.
Nope Don, not unless they are famillar with the procedures and/or have the info to do those procedures for seawater. Many make this mistake, thinking you can test seawater just like you test FW. The salt affect many tests. There is a book out on testing seawater.
Analysis of Seawater : A Guide for the Analytical and Environmental Chemist by T.R. Crompton, May 1, 2006
Methods of Seawater Analysis by Klaus Grasshoff, Nov 1983.
But by all means ask them. So far it is only ENC Labs
ENC Labs
http://www.enclabs.com/index.htm
Nope Don, not unless they are famillar with the procedures and/or have the info to do those procedures for seawater. Many make this mistake, thinking you can test seawater just like you test FW. The salt affect many tests. There is a book out on testing seawater.
Analysis of Seawater : A Guide for the Analytical and Environmental Chemist by T.R. Crompton, May 1, 2006
Methods of Seawater Analysis by Klaus Grasshoff, Nov 1983.
But by all means ask them. So far it is only ENC Labs
ENC Labs
http://www.enclabs.com/index.htm
Here is their quote andcontact info. According to U of W marine EPA 6010 is the test standard or method they use, although I dont claim do understand it.
http://www.home.earthlink.net/~dwacker/Quote.PDF
http://www.home.earthlink.net/~dwacker/Quote.PDF
As long as it is a marine or seawater std they/we are fine. I do not think we need to know how much copper there is in the water as far as tests go. All seasalts are below NSW. That "Digestion" why is that there we don't need it.
It looks like I missed another AWT error
Copper (Cu++)
Natural Seawater Value: 0.030 mg/L
Ah nope, as I said more like .0002 NSW. Looks like they are off a decimal again like they were with Mo:lol:
We could take that quote Don and add Bromide and OTO/TRO but I don t' think we will find many bitting on ~$8.00 / parameter. But I must say that is lots cheaper than ENC.
It looks like I missed another AWT error
Copper (Cu++)
Natural Seawater Value: 0.030 mg/L
Ah nope, as I said more like .0002 NSW. Looks like they are off a decimal again like they were with Mo:lol:
We could take that quote Don and add Bromide and OTO/TRO but I don t' think we will find many bitting on ~$8.00 / parameter. But I must say that is lots cheaper than ENC.
Thought you might be interested in this....
I sent in a sample of Petco "real ocean water".... Heated and circulated for 24h, I tested pH at 8.3 and sg of 1.026 by refractometer...
______________________________
Ammonia (NH3-4) 0.016 Good
Nitrite (NO2) 0.007 Good
Nitrate (NO3) 0.8 Good
Phosphate (PO4) 0.04 Good
Silica (SiO2-3) 0.0 Good
Potassium (K) 315 Low
Calcium (Ca) 372 Good
Boron (B) 3.0 Good
Molybdenum (Mo) 0.2 High
Strontium (Sr) 9.2 Good
Magnesium (Mg) 1137 Good
Iodine (I¯) 0.09 Good
Copper (Cu++) 0.02 Good
Alkalinity (meq/L) 6.42 High
_________________________________
Ammonia (NH3-4)
Natural Seawater Value: 0.010 mg/L
Acceptable Range: 0.000 to 0.050 mg/L
Tested: 0.016 mg/L (GOOD)
Nitrite (NO2)
Natural Seawater Value: 0.010 mg/L
Acceptable Range: 0.000 to 0.100 mg/L
Tested:
0.007 mg/L (GOOD)
Nitrate (NO3)
Natural Seawater Value: 0.050 mg/L
Acceptable Range: 0.000 to 25 mg/L
Tested:
0.8 mg/L (GOOD)
Phosphate (PO4)
Natural Seawater Value: 0.030 mg/L
Acceptable Range: 0.000 to 0.250 mg/L
Tested:
0.04 mg/L (GOOD)
Silica (Sio2-3)
Natural Seawater Value: 0.040 mg/L
Acceptable Range: 0.000 to 0.500 mg/L
Tested:
0.0 mg/L (GOOD)
Potassium (K)
Natural Seawater Value: 390 mg/L
Acceptable Range: 350 to 450 mg/L
Tested:
315 mg/L (LOW)
Calcium (Ca)
Natural Seawater Value: 400 mg/L
Acceptable Range: 350 to 450 mg/L
Tested:
372 mg/L (GOOD)
Boron (B)
Natural Seawater Value: 4.6 mg/L
Acceptable Range: 3.0 â€"œ 6.0 mg/L
Tested:
3.0 mg/L (GOOD)
Molybdenum (Mo)
Natural Seawater Value: 0.01 mg/L
Acceptable Range: 0.0 to 0.12 mg/L
Tested:
0.2 mg/L (HIGH)
Strontium (Sr)
Natural Seawater Value: 8.1 mg/L
Acceptable Range: 5.0 to 12.0 mg/L
Tested:
9.2 mg/L (GOOD)
Magnesium (Mg)
Natural Seawater Value: 1280 mg/L
Acceptable Range: 1100 to 1400 mg/L
Tested:
1137 mg/L (GOOD)
Iodine (I¯)
Natural Seawater Value: 0.060 mg/L
Acceptable Range: 0.030 to 0.090 mg/L
Tested:
0.09 mg/L (GOOD)
Copper (Cu++)
Natural Seawater Value: 0.030 mg/L
Acceptable Range: 0.000 to 0.030 mg/L
Tested:
0.02 mg/L (GOOD)
Alkalinity (meq/L)
Natural Seawater Value: 2.5 meq/L
Acceptable Range: 2.5 to 5.0 meq/L
Tested:
6.42 meq/L (HIGH)
I sent in a sample of Petco "real ocean water".... Heated and circulated for 24h, I tested pH at 8.3 and sg of 1.026 by refractometer...
______________________________
Ammonia (NH3-4) 0.016 Good
Nitrite (NO2) 0.007 Good
Nitrate (NO3) 0.8 Good
Phosphate (PO4) 0.04 Good
Silica (SiO2-3) 0.0 Good
Potassium (K) 315 Low
Calcium (Ca) 372 Good
Boron (B) 3.0 Good
Molybdenum (Mo) 0.2 High
Strontium (Sr) 9.2 Good
Magnesium (Mg) 1137 Good
Iodine (I¯) 0.09 Good
Copper (Cu++) 0.02 Good
Alkalinity (meq/L) 6.42 High
_________________________________
Ammonia (NH3-4)
Natural Seawater Value: 0.010 mg/L
Acceptable Range: 0.000 to 0.050 mg/L
Tested: 0.016 mg/L (GOOD)
Nitrite (NO2)
Natural Seawater Value: 0.010 mg/L
Acceptable Range: 0.000 to 0.100 mg/L
Tested:
0.007 mg/L (GOOD)
Nitrate (NO3)
Natural Seawater Value: 0.050 mg/L
Acceptable Range: 0.000 to 25 mg/L
Tested:
0.8 mg/L (GOOD)
Phosphate (PO4)
Natural Seawater Value: 0.030 mg/L
Acceptable Range: 0.000 to 0.250 mg/L
Tested:
0.04 mg/L (GOOD)
Silica (Sio2-3)
Natural Seawater Value: 0.040 mg/L
Acceptable Range: 0.000 to 0.500 mg/L
Tested:
0.0 mg/L (GOOD)
Potassium (K)
Natural Seawater Value: 390 mg/L
Acceptable Range: 350 to 450 mg/L
Tested:
315 mg/L (LOW)
Calcium (Ca)
Natural Seawater Value: 400 mg/L
Acceptable Range: 350 to 450 mg/L
Tested:
372 mg/L (GOOD)
Boron (B)
Natural Seawater Value: 4.6 mg/L
Acceptable Range: 3.0 â€"œ 6.0 mg/L
Tested:
3.0 mg/L (GOOD)
Molybdenum (Mo)
Natural Seawater Value: 0.01 mg/L
Acceptable Range: 0.0 to 0.12 mg/L
Tested:
0.2 mg/L (HIGH)
Strontium (Sr)
Natural Seawater Value: 8.1 mg/L
Acceptable Range: 5.0 to 12.0 mg/L
Tested:
9.2 mg/L (GOOD)
Magnesium (Mg)
Natural Seawater Value: 1280 mg/L
Acceptable Range: 1100 to 1400 mg/L
Tested:
1137 mg/L (GOOD)
Iodine (I¯)
Natural Seawater Value: 0.060 mg/L
Acceptable Range: 0.030 to 0.090 mg/L
Tested:
0.09 mg/L (GOOD)
Copper (Cu++)
Natural Seawater Value: 0.030 mg/L
Acceptable Range: 0.000 to 0.030 mg/L
Tested:
0.02 mg/L (GOOD)
Alkalinity (meq/L)
Natural Seawater Value: 2.5 meq/L
Acceptable Range: 2.5 to 5.0 meq/L
Tested:
6.42 meq/L (HIGH)
Thales
Active member
Hey guys, what do you think about this.
First awt results Silica .3 (good)
Second awt results Silica 2.7 (high)
Is that much of a jump really possible? A water change was done from the same 150 gallon mixing tank the day before each sample was sent, and the only other things added were a teaspoon and a half of borax, some K, Mag and Dow after the first test.
RR
First awt results Silica .3 (good)
Second awt results Silica 2.7 (high)
Is that much of a jump really possible? A water change was done from the same 150 gallon mixing tank the day before each sample was sent, and the only other things added were a teaspoon and a half of borax, some K, Mag and Dow after the first test.
RR
ReefJerk
Member
Doesn't seem viable that adding all that could give you a substantila increase in Silica? Do you know the chcemical makeup(as far as Silica goes, at least) of the Borax, Potassium, Mag, and Dowflake?<a href=showthread.php?s=&postid=11235322#post11235322 target=_blank>Originally posted</a> by Thales
Hey guys, what do you think about this.
First awt results Silica .3 (good)
Second awt results Silica 2.7 (high)
Is that much of a jump really possible? A water change was done from the same 150 gallon mixing tank the day before each sample was sent, and the only other things added were a teaspoon and a half of borax, some K, Mag and Dow after the first test.
RR
ReefJerk
Member
I am very intesrested in what your comments are about the readings from this water. Can you please post some feedback? Thanks.
Also, I am not a customer of AWT. I have been thinking about it and want to get all the info I can. So, if it seems I am being a little skeptical about some of your comments, please know that I absolutely am
Just wanted to be clear.Cliff
<a href=showthread.php?s=&postid=11240140#post11240140 target=_blank>Originally posted</a> by ReefJerk
I am very intesrested in what your comments are about the readings from this water. Can you please post some feedback? Thanks.
Also, I am not a customer of AWT. I have been thinking about it and want to get all the info I can. So, if it seems I am being a little skeptical about some of your comments, please know that I absolutely am
Cliff
Cliff:
I posted a new thread about that water, including feedback.
http://www.reefcentral.com/forums/showthread.php?s=&threadid=1255993
Interesting. I have a Hach portable spectrophotometer (the mid-range model, I think it's model 850). I checked the unit against Hach's phosphate standard solution shortly after I got it. I found the MDL for my technique to be about 0.02 as it was able to detect that concentration in 3 out of 3 tests. The measurements ranged from 0.01 to 0.03 on those samples.
I drew a water sample and sent part to AWT and the other I tested with my kits and spectrophotometer. I measured my PO4 at 0.12, (it usually runs high at .03 to .07), but then their results came back as 0.01. If their test result is right then my meter is now off by a factor of 10 while I previously found it to be accurate to +/- 0.01 (a factor of 1.5) at the low end of its range. Unless my meter has drifted (I plan to recheck the calibration) their results are way off.
Allen
