Water Quality B/C

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Re: Water Quality B/C

Post by personasaurus rex » February 7th, 2012, 5:33 pm

tornado guy wrote:
quizbowl wrote:Hmm, has anyone ever had a problem with their readings due to the temperature of the mixture?
I don't see how that would affect your readings.
temperature plays a factor in the density of materials. however, i don't see a way to work around that with the straw-floating device.
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Re: Water Quality B/C

Post by cngu23 » February 7th, 2012, 7:10 pm

ptkid wrote:
gigaboo wrote:Is iodized salt pure enough to use for our solutions when we calibrate the salinometer?
I used iodized salt.
will the type of salt you use cause i significant difference in the results?

and temperature should affect the whole system, not just the density of one component, so you should still get accurate measurements.
I am doing all of this at room temperature
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Re: Water Quality B/C

Post by personasaurus rex » February 7th, 2012, 7:26 pm

cngu23 wrote: and temperature should affect the whole system, not just the density of one component, so you should still get accurate measurements.
I am doing all of this at room temperature
Well i would expect everyone to be working at room temperature. however, the temperature of the water should vary your results slightly, but i highly doubt enough that it will make a significant difference. the density of the salt solution is changed by its temperature. water is densest at 4 degrees celsius, and the same goes when salts are dissolved in it.
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Re: Water Quality B/C

Post by cngu23 » February 8th, 2012, 4:35 am

For water testing on nitrates, should we know the brown right test, devarda's test, or both?

And for each of the chemical tests (nitrates, phosphates,etc) should we know that chemical reactions that occur?
such as
NO3- + 3Fe2+ + 4H+ → 3Fe3+ + NO + 2H2O
[Fe(H2O)6]2+ + NO → [Fe(H2O)5(NO)]2+ + H2o
for the nitrates test?
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Re: Water Quality B/C

Post by Vizard007 » February 12th, 2012, 11:14 am

Hey guys, I was wondering for the macro-invertebrates... when they list something like "Mayfly," do we have to know all the different types? OR do we just have to know the name of the different types and their different functions? If we do have to know the different types, how in depth should we be studying? Sorry for the trouble, and thanks for the help!
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Re: Water Quality B/C

Post by sciencegirl23 » February 12th, 2012, 11:39 am

I don't think they will get that specific. I've never had very specific questions on any of my tests so far. Mainly they just ask you to identify the bug, it's life stage, and whether they indicate good or poor water quality. You should also know general things like whether they have complete or incomplete metamorphosis, what they eat, and stuff like that.
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Re: Water Quality B/C

Post by cngu23 » February 12th, 2012, 3:01 pm

sciencegirl23 wrote:I don't think they will get that specific. I've never had very specific questions on any of my tests so far. Mainly they just ask you to identify the bug, it's life stage, and whether they indicate good or poor water quality. You should also know general things like whether they have complete or incomplete metamorphosis, what they eat, and stuff like that.
by life stage, is it just basically larvae, or adult? i think those are the only 2 life stages of each insect?

and back to my previous question, how specific does it get for knowing each water quality test? will they ask for the chemical equations/reactions and what exactly happens? Because for some tests, to perform them, all you need to do is mix a few things in a tube.
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Re: Water Quality B/C

Post by sciencegirl23 » February 12th, 2012, 3:12 pm

Well insects with complete metamorphosis have 4 stages: eggs, larvae, pupa, adult.
Insects with incomplete metamorphosis have 3 stages: eggs, nymph, adult.
You'll probably only be given pictures of nymph, larvae, and adults.
And for your second question, I've never been given questions that specific about the water quality tests. They usually just ask the causes/effects of each, like what causes turbidity? What are results of increased turbidity in a stream?
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Re: Water Quality B/C

Post by Just because » February 15th, 2012, 6:53 pm

In the rules it says that we will have to interpret data about salinity, pH, DO, BOD, etc. Does that mean they are going to give us the straight out test results and we will have to find the Q-value then the total, or will they give us the Q-value, or what else?

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Re: Water Quality B/C

Post by cngu23 » February 16th, 2012, 4:26 am

Just because wrote:In the rules it says that we will have to interpret data about salinity, pH, DO, BOD, etc. Does that mean they are going to give us the straight out test results and we will have to find the Q-value then the total, or will they give us the Q-value, or what else?
I think that they just give you the q values, so all you need to know are the weighting factors and calculate the final result.

also for the invasive plants and animals, do you need to know the same things as the other macroinvertebrates, or should you include more information.
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