Water Quality B/C

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John Richardsim
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Re: Water Quality B/C

Postby John Richardsim » January 27th, 2019, 9:44 am

Check out this quizlet set for macroinvertebrate identification that I just finished: https://quizlet.com/363496522/water-qua ... ash-cards/
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Re: Water Quality B/C

Postby aflucke » January 27th, 2019, 6:03 pm

A team at our last invitational was recently disqualified from the water quality event for tasting the salt water solution; is this a legitimate reason for disqualification?

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Re: Water Quality B/C

Postby John Richardsim » January 27th, 2019, 6:53 pm

A team at our last invitational was recently disqualified from the water quality event for tasting the salt water solution; is this a legitimate reason for disqualification?
Absolutely. While small amounts of a salt water solution itself isn't dangerous to ingest, the fact that the solution is being used in a lab setting (even if the event wasn't in a lab room, the water was likely stored in a graduated cylinder, a beaker, or even just a large tub -- some container for which it should be apparent that the water isn't for consumption) makes this a safety violation of a pretty standard lab rule.
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Re: Water Quality B/C

Postby MattChina » January 27th, 2019, 6:54 pm

A team at our last invitational was recently disqualified from the water quality event for tasting the salt water solution; is this a legitimate reason for disqualification?
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Re: Water Quality B/C

Postby Rivkaaa » February 3rd, 2019, 10:34 am

A team at our last invitational was recently disqualified from the water quality event for tasting the salt water solution; is this a legitimate reason for disqualification?
Never eat ur experiments
lol yeah! Another common disqualifying factor is in CB when teams decide to taste the salt/sugar mixtures in order to tell which one it is!
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Re: Water Quality B/C

Postby Flyingfish » February 4th, 2019, 12:44 pm

For the salinometer, my 1-10% marks are really close, and those are only for whole numbers. How are we expected to measure down to the tenth? We are using a straw with clay on the end. Is there a way to spread out these marks more? Also, depending on how the salinometer is put into the water, the measurement tends to vary by a percent.

Please help :(

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Re: Water Quality B/C

Postby jimmy-bond » February 4th, 2019, 1:12 pm

For the salinometer, my 1-10% marks are really close, and those are only for whole numbers. How are we expected to measure down to the tenth? We are using a straw with clay on the end. Is there a way to spread out these marks more? Also, depending on how the salinometer is put into the water, the measurement tends to vary by a percent.

Please help :(
One possibility is electronically calibrating a salinometer but that's a lotta work. One thing I found to change how far apart the lines are is changing the shape of the clay. And about measuring to the tenth, you should have the integer lines marked and estimate from there; the exact doesn't really matter because you get a wide range of values for full credit.
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Re: Water Quality B/C

Postby annchen128 » February 4th, 2019, 7:47 pm

Are we supposed to know the pupa/egg form of the organism during identification?
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Re: Water Quality B/C

Postby kate! » February 4th, 2019, 8:00 pm

Are we supposed to know the pupa/egg form of the organism during identification?
I think it depends on the organism, but most likely no? Just larvae and adult. Unless it's, like, water mite or uh giant water bug where the eggs are on another organism or on it.
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Re: Water Quality B/C

Postby jimmy-bond » February 4th, 2019, 8:50 pm

Are we supposed to know the pupa/egg form of the organism during identification?
I've seen it come up for C, and I recommend knowing the most obvious ones at least.
If life gives you melons, you're dyslexic.

Why can't dinosaurs ski? Because they're dead.

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