grams NaCl
---------- x 10^3 = ppt
Liter
800 lbs NaCl = 362873.9 grams. Resulted in a salinity of 2.2 ppt.
600 lbs NaCl = 272155.4 grams. Resulted in a salinity of 1.2 ppt.
400 lbs NaCl = 181436.9 grams. Resulted in a salinity of 1.1 ppt.
200 lbs NaCl = 90718.47 grams. Resulted in a salinity of 0.6 ppt.
The input water was 0.1 ppt so subtract 0.1 from all salinity values to
adjust for the raw water (see below).
Solve for liters and convert to gallons:
# liters = (grams NaCl x 10^3)/ppt
_at_ 800 lbs:
# liters = (362873.9 grams NaCl x 10^3)/2.1 ppt = 172,754,238 L
# gallons = # liters / 3.785412 gal/L = 45,636,839 gallons
_at_ 600 lbs:
# liters = (272155.4 grams NaCl x 10^3)/1.1 ppt = 247,414,000 L
# gallons = # liters / 3.785412 gal/L = 65,359,860 gallons
_at_ 400 lbs:
# liters = (181436.9 grams NaCl x 10^3)/1.0 ppt = 181,436,900 L
# gallons = # liters / 3.785412 gal/L = 47,930,555 gallons
_at_ 200 lbs:
# liters = (90718.47 grams NaCl x 10^3)/0.6 ppt = 151,197,450 L
# gallons = # liters / 3.785412 gal/L = 39,942,138 gallons
I believe that your salinity and conductivity reading that you took after
you had added 600 lbs salt to the tank is off so omit that reading and find
an average of your gallons. I base the omission on drawing a Salinity (ppt)
chart vs Conductivity (ms). If that 600 lb reading is omitted the R^2
result of that graph is 0.9993. With it, it's 0.9471.
I'd say your display tank is about 44,500,000 gallons. If I'm right (and
I'm pretty sure I am), that's a friggin HUGE tank!
Shane
> -----Original Message-----
> From: Nick Zarlinga
> Sent: Wednesday, January 21, 2004 8:24 AM
> To: Aquatic Information Listserve (E-mail); NANFA List Server (E-mail)
> Subject: NANFA-- a lil' help from my friends....
>
>
> Ok, time to put the brain in gear ;) We have an outdoor
> exhibit that we
> need to find the volume of. It is a "naturally" shaped exhibit with a
> textured concrete bottom and a deceivingly large "volcano
> like" planter in
> the middle. We need to find the gallonage to be able to dose
> medications.
> In October, we had the system drained for repairs and so we
> thought we would
> be smart and put a flow meter on the system to fill it. Actually, we
> thought we would go one better and put two flow meters in
> line so that we
> had a backup to verify our results. Well, unfortunately, the two flow
> meters read vastly different amounts. So now we are back to
> square one.
> What we decided to do was to go the back door route. By
> adding NaCl to the
> system, we figure that we can measure conductivity and
> extrapolate from
> there. So, here is the data. Have at it, if you wouldn't mind.
>
>
> Measurements were taken with YSI 30 conductivity meter which
> was on the
> temperature compensated mode.
>
> Day 0 conductivity 268 microsiemens (.1 ppt) at 37F
> added 200 lbs of NaCl
> Day 1 conductivity 1130 microsiemens (.6 ppt) at 37F
> added 200 lbs of NaCl
> Day 2 conductivity 2080 microsiemens (1.1 ppt) at 36F
> added 200 lbs of NaCl
> Day 3 conductivity 3075 microsiemens (1.2 ppt) at 36F
> added 200 lbs of NaCl
> Day 4 conductivity 4160 microsiemens (2.2 ppt) at 36F
>
>
> Here are some other values that I tested:
>
> 1 lb of NaCl in 1 gallon of tap water (257 microsiemens)
> raised conductivity
> to 140 millisiemens
>
> 10 grams of NaCl in 1000 ml of Distilled water raised
> conductivity to 17
> millisiemens (9.9 ppt)
>
> 1 gram of NaCl in 1000ml of Distilled water raised
> conductivity to 2174
> microsiemens (1.1 ppt)
>
>
> As you can see from these known values that it certainly was
> not lab quality
> measurements. But, for our purposes, a close figure would be
> very helpful to
> us. Thanks for the help.
>
>
> Oh, and also, you don't get a grade unless you show your work ;)
>
>
>
>
>
>
> Nick Zarlinga
> Aquarium Biologist
> Cleveland Metroparks Zoo
> 216.661.6500 ext 4485
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