Water Quality B/C

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3nv1r0nm3ntal ch3m
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Re: Water Quality B/C

Post by 3nv1r0nm3ntal ch3m » October 13th, 2011, 4:09 am

tornado guy wrote:
JKrafsur wrote:Im being truly honest here, size 4 or 6 font actually is very readable. I used that on my cheat sheets last year and put each section in different color to depict each area, easy to use and you can fit twice the info on the sheet
Use a small font and handwrite in all the upper margins of the paper where the computer doesn't type on.
couldn't you just decrease the margins and still type there?

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Re: Water Quality B/C

Post by tornado guy » October 13th, 2011, 7:15 am

3nv1r0nm3ntal ch3m wrote:
Use a small font and handwrite in all the upper margins of the paper where the computer doesn't type on.
couldn't you just decrease the margins and still type there?[/quote]

I suppose you could.. Sometimes though you can remember more if you handwrite, so you might not even have to use that part of the sheet.
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Re: Water Quality B/C

Post by 3nv1r0nm3ntal ch3m » October 15th, 2011, 1:10 pm

I guess that makes sense. You could probably save some time, too, since you might then remember it and not have to find it on the sheet.

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Re: Water Quality B/C

Post by Fossil Freak 25 » October 15th, 2011, 2:46 pm

Does anybody know a good site for macroinvertebrates?
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Re: Water Quality B/C

Post by tornado guy » October 15th, 2011, 3:17 pm

Fossil Freak 25 wrote:Does anybody know a good site for macroinvertebrates?
Here Fossil http://www.ncsu.edu/sciencejunction/dep ... ons/macro/
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Re: Water Quality B/C

Post by quizbowl » October 15th, 2011, 5:42 pm

How is everyone doing on building their salinometer? On the rules, they specified testing certain salinity percentages of up to 10% - how specific do they want us to measure it? To 1%? To .1%?
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Re: Water Quality B/C

Post by nerpas » October 16th, 2011, 12:59 pm

quizbowl wrote:How is everyone doing on building their salinometer? On the rules, they specified testing certain salinity percentages of up to 10% - how specific do they want us to measure it? To 1%? To .1%?
Since it doesn't say in the rules, you might want to get an official clarification

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Re: Water Quality B/C

Post by cngu23 » October 16th, 2011, 4:45 pm

quizbowl wrote:How is everyone doing on building their salinometer? On the rules, they specified testing certain salinity percentages of up to 10% - how specific do they want us to measure it? To 1%? To .1%?
Anyone want to give some advice on making a salinometer? I understand the basic principle that the device should send a current through the water sample, since salt water conducts electricity.
Also, I read somewhere that you can use refractivity to determine salt water concentration, because the angle of refraction between air and water is different in different salinity levels.

EDIT: Also, there might be an easier method to just use a hydrometer, which measures the specific gravity of the water.
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Re: Water Quality B/C

Post by gneissisnice » October 17th, 2011, 3:35 pm

cngu23 wrote:
quizbowl wrote:How is everyone doing on building their salinometer? On the rules, they specified testing certain salinity percentages of up to 10% - how specific do they want us to measure it? To 1%? To .1%?
Anyone want to give some advice on making a salinometer? I understand the basic principle that the device should send a current through the water sample, since salt water conducts electricity.
Also, I read somewhere that you can use refractivity to determine salt water concentration, because the angle of refraction between air and water is different in different salinity levels.

EDIT: Also, there might be an easier method to just use a hydrometer, which measures the specific gravity of the water.
It doesn't have to be that complex. The simplest thing to do is to basically make a glass tube with some clay attached to the bottom. Then just test it in distilled water and water with varying amounts of salt, and see how high it floats in different salinity levels, marking off the points for each trial. Use that to calibrate it and then you can use it to test an unknown solution by reading off the marks you put on.

You have to play with the amount of clay you use to make sure that it basically sinks in fresh water and then floats higher and higher as you add salt.
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Re: Water Quality B/C

Post by VeritasEnVida » October 18th, 2011, 9:35 pm

Genissnice, can you elaborate a little on that? So clay will float when water is denser than the clay, but that only measure for that one level of salinity shouldn't it or are you saying it floats a little bit more? in increments, that's a awesome idea but one bump and you could be off by a couple percentage points which would suck
also would the clay dry out when not in use and then when it's moist that would affect it also hmmm
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