Hanna Calibration Solution Storage

mmedeiros2 · 12/27/2008, 06:20 PM

Does anyone know if you can store the leftover Hanna 7.0 and 10.0 calibration solution that comes in the aluminum packs so that what is not used can be used at a later time? I was thinking of mabey purchasing small plastic bottles.
Thanks.

WaterKeeper · 12/27/2008, 06:24 PM

pH 7 buffer is fairly stable so unless evaporation or bacterial contamination takes place it should be stable for 6 months or more. pH 10 is a different story, Once opened it starts to absorb carbon dioxide from the air. After about a week or so the pH will no longer be 10 if left in the open air.

mmedeiros2 · 12/27/2008, 07:06 PM

Thanks Tom. Do you think the ph ten will last a little while if I button it up in a plastic bottle right after I remove some for calibration? I guess there will be a little CO2 in the bottle. Prob. a lot in my case. I'm the guy with 3200 PPM CO2 in my bedroom in the AM after sleeping all night with the door shut. I'm looking into heat exchanger ventilation, before I go brain dead.
On another note. I have a Red Sea Mag. Test Kit that is supposed to change the solution from red to the end color of DEEP BLUE. When I get my color change, it is init. purple. If I keep adding regant drops, it never changes to DEEP BLUE. Should I be using the first sign of change in color as my marking point.
Thanks again WK.
Moe, Larry, cheese.

WaterKeeper · 12/27/2008, 10:03 PM

We use pH 10 in plastic bottles in the lab all the time and it holds pH pretty well if not left in an open container. What you plan is fine.

I've never tested Mg by direct colorimeteric methods. In the calcium test calcon is the indicator and it must be titrated to a true blue without a trace of red. It may be the magnesium kit employs eriochrome black T as the indicator and the calcium is sequestered in some manner. That dye has always been a problem when it was used in the total hardness test. In solution it has a very limited shelf life so dry powder mixes are normally used. If your indicator is a liquid then it may have passed its useful life.

mmedeiros2 · 12/27/2008, 10:47 PM

I just purchased it. I will prob. call Red Sea and see what they have to say. Mabey I am color blind, who knows. A lot of thing have happened to my body since I quit drinking beer 10 yrs. ago.
Should have never done it.
Thanks again for all the info. WK.
Best of the New Year to you and your family.

12/27/2008, 06:20 PM	#1
mmedeiros2 Registered Member Join Date: Apr 2008 Location: Dartmouth, Ma. Posts: 452	Hanna Calibration Solution Storage Does anyone know if you can store the leftover Hanna 7.0 and 10.0 calibration solution that comes in the aluminum packs so that what is not used can be used at a later time? I was thinking of mabey purchasing small plastic bottles. Thanks. __________________ One must always be aware for the unexpected. Mike Current Tank Info: 75 gal. / Sump / Skimmer / 65 Lbs. LR / 2 Cleaner Shrimp / Firefish / Bangi Cardinal / Pearly Jawfish / 3 - Yellow Clown Gobies / Yellow Wrasse / Hermits

12/27/2008, 06:24 PM	#2
WaterKeeper Bogus Information Expert Join Date: Oct 2000 Location: SW Ohio Posts: 16,147	pH 7 buffer is fairly stable so unless evaporation or bacterial contamination takes place it should be stable for 6 months or more. pH 10 is a different story, Once opened it starts to absorb carbon dioxide from the air. After about a week or so the pH will no longer be 10 if left in the open air. __________________ "Leading the information hungry reefer down the road to starvation" Tom Current Tank Info: 130 Now out of service and a 29

12/27/2008, 07:06 PM	#3
mmedeiros2 Registered Member Join Date: Apr 2008 Location: Dartmouth, Ma. Posts: 452	Thanks Tom. Do you think the ph ten will last a little while if I button it up in a plastic bottle right after I remove some for calibration? I guess there will be a little CO2 in the bottle. Prob. a lot in my case. I'm the guy with 3200 PPM CO2 in my bedroom in the AM after sleeping all night with the door shut. I'm looking into heat exchanger ventilation, before I go brain dead. On another note. I have a Red Sea Mag. Test Kit that is supposed to change the solution from red to the end color of DEEP BLUE. When I get my color change, it is init. purple. If I keep adding regant drops, it never changes to DEEP BLUE. Should I be using the first sign of change in color as my marking point. Thanks again WK. Moe, Larry, cheese. __________________ One must always be aware for the unexpected. Mike Current Tank Info: 75 gal. / Sump / Skimmer / 65 Lbs. LR / 2 Cleaner Shrimp / Firefish / Bangi Cardinal / Pearly Jawfish / 3 - Yellow Clown Gobies / Yellow Wrasse / Hermits

12/27/2008, 10:03 PM	#4
WaterKeeper Bogus Information Expert Join Date: Oct 2000 Location: SW Ohio Posts: 16,147	We use pH 10 in plastic bottles in the lab all the time and it holds pH pretty well if not left in an open container. What you plan is fine. I've never tested Mg by direct colorimeteric methods. In the calcium test calcon is the indicator and it must be titrated to a true blue without a trace of red. It may be the magnesium kit employs eriochrome black T as the indicator and the calcium is sequestered in some manner. That dye has always been a problem when it was used in the total hardness test. In solution it has a very limited shelf life so dry powder mixes are normally used. If your indicator is a liquid then it may have passed its useful life. __________________ "Leading the information hungry reefer down the road to starvation" Tom Current Tank Info: 130 Now out of service and a 29

12/27/2008, 10:47 PM	#5
mmedeiros2 Registered Member Join Date: Apr 2008 Location: Dartmouth, Ma. Posts: 452	I just purchased it. I will prob. call Red Sea and see what they have to say. Mabey I am color blind, who knows. A lot of thing have happened to my body since I quit drinking beer 10 yrs. ago. Should have never done it. Thanks again for all the info. WK. Best of the New Year to you and your family. __________________ One must always be aware for the unexpected. Mike Current Tank Info: 75 gal. / Sump / Skimmer / 65 Lbs. LR / 2 Cleaner Shrimp / Firefish / Bangi Cardinal / Pearly Jawfish / 3 - Yellow Clown Gobies / Yellow Wrasse / Hermits