Water Quality B/C

[3nv1r0nm3ntal ch3m]

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?

[tornado guy]

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.

[3nv1r0nm3ntal ch3m]

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.

[Fossil Freak 25]

Does anybody know a good site for macroinvertebrates?

[tornado guy]

Does anybody know a good site for macroinvertebrates?

Here Fossil http://www.ncsu.edu/sciencejunction/dep ... ons/macro/

[quizbowl]

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%?

[nerpas]

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

[cngu23]

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.

[gneissisnice]

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.

[VeritasEnVida]

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