Environmental Chem

User avatar
gyourkoshaven
Member
Member
Posts: 459
Joined: April 14th, 2008, 12:16 pm
Division: C
State: PA
Location: SHHS
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by gyourkoshaven » April 11th, 2009, 5:34 pm

I'm not sure about the first one, but the answer to the 2nd question I do know. Synthetic fertilizer advantages are that they can provide a lot more phosphorous and potassium than compost, and they can provide only what is necessary for the soil, since the creators design them that way.
Strath Haven MS:
2008: Regionals-3, States-5
2009: Regionals-2, States-4
2010: Regionals-1, States-2, Nationals-19 :)
2011 (Co-captain): Regionals-1, States-1, Nationals-11 :D

Nationals: Aquifers-37, Compute This-13, Dynamic Planet-25, Ecology-6, Experimental Design-7, Junkyard-33

Moving to C...

User avatar
Phenylethylamine
Exalted Member
Exalted Member
Posts: 1075
Joined: January 8th, 2009, 4:47 pm
Division: Grad
State: MA
Location: Harvard University
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by Phenylethylamine » April 11th, 2009, 5:51 pm

I'd guess that irrigation can damage topsoil by washing it away, or leaching minerals out of it, or causing it to become overly waterlogged... some or all of those.
Protein Modeling Event Supervisor 2015
MA State Science Olympiad Tournament
MIT Invitational Tournament
--
Ward Melville High School Science Olympiad 2010-2012
Paul J Gelinas JHS Science Olympiad 2007-2009

User avatar
2win
Member
Member
Posts: 553
Joined: March 3rd, 2009, 6:07 pm
Division: C
State: TX
Location: h-town
Has thanked: 0
Been thanked: 0
Contact:

Re: Environmental Chem

Post by 2win » April 11th, 2009, 6:11 pm

Thanks. That's what my partner and I came up with, but our coach and teammates said we needed to have someone verify that.
k-tx. retiring from scioly.

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by kjhsscioly » April 11th, 2009, 6:20 pm

for the first, erosion is a huge problem with irrigation, especially when farmer plant fields every year without crop rotation. Also, if the water is tainted, it can result in plants with hazardous minerals in them (lead, mercury, and others)
for the second, it is most likely that they can provide a more targeted mix of N-P-K than organic fertilizers can, i.e plant specific, or nutrient specific. They are also usually stronger and for commercial farming, give bigger results.

User avatar
2win
Member
Member
Posts: 553
Joined: March 3rd, 2009, 6:07 pm
Division: C
State: TX
Location: h-town
Has thanked: 0
Been thanked: 0
Contact:

Re: Environmental Chem

Post by 2win » April 11th, 2009, 6:25 pm

ah, okay, thanks!
btw, does your username mean katy junior high school science olympiad? if not, then never mind.
k-tx. retiring from scioly.

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by kjhsscioly » April 11th, 2009, 6:29 pm

not even close, though it is a very generic name

User avatar
2win
Member
Member
Posts: 553
Joined: March 3rd, 2009, 6:07 pm
Division: C
State: TX
Location: h-town
Has thanked: 0
Been thanked: 0
Contact:

Re: Environmental Chem

Post by 2win » April 11th, 2009, 6:32 pm

oh,ok, i was just curious.
another question: when testing soil pH with a probe, do you have to mix the soil with distilled water? or is that just for testing with pH paper?
k-tx. retiring from scioly.

User avatar
kjhsscioly
Exalted Member
Exalted Member
Posts: 517
Joined: January 16th, 2009, 11:55 am
Division: Grad
State: IL
Location: Chicago
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by kjhsscioly » April 11th, 2009, 6:39 pm

this is from http://www.ehow.com/how_4781811_use-ph-meter.html
step1
Make sure that the pH probe you are using has been stored in a storage solution or a pH 4 solution. If this is not the case, soak the probe in distilled water for at least 24 hours.
Step2
Check that the meter is set in pH mode, and then rinse the probe of your meter in distilled water. Shake it off before placing it in a pH 7 solution for calibration.
Step3
Let the probe remain in the solution for at least 30 seconds to allow time for the meter to stabilize, and then adjust the meter so that it reads pH 7.
Step4
Rinse once again and then place it into a pH 4 solution, giving time for the meter reading to stabilize. Adjust the meter so that it reads pH 4. Your meter has now been calibrated.
Step5
Rinse the probe once again as you have done before and shake off any excess liquid. The probe is now ready to be placed in your sample liquid.
Step6
After allowing the pH reading to settle as you have done before, take the pH reading of your sample.
Step7
Store the probe in storage solution or a pH 4 solution when finished measuring.

User avatar
2win
Member
Member
Posts: 553
Joined: March 3rd, 2009, 6:07 pm
Division: C
State: TX
Location: h-town
Has thanked: 0
Been thanked: 0
Contact:

Re: Environmental Chem

Post by 2win » April 11th, 2009, 6:44 pm

Thank- you once again. My coach didn't know about the calibration thing.
k-tx. retiring from scioly.

emilyy18
Member
Member
Posts: 72
Joined: April 5th, 2009, 11:09 am
Division: B
Location: St. Gregory the Great School, Williamsville, New York
Has thanked: 0
Been thanked: 0

Re: Environmental Chem

Post by emilyy18 » April 11th, 2009, 9:12 pm

zOMG you have to do all that before using a probe!! Supposedly we are using probes in competition, how do you know they calibrated it beforehand for you, and they did so correctly!? ahh
St. Gregory the Great Science Olympiad 2009
[[ dynamic planet. road scholar. environmental chem. pentathlon. ]]

States 09
6th- Road Scholar
6th- Penathlon
12th- Env. Chem.
16th- Dynamic Planet. ugh we thought we did so good!

Post Reply

Return to “2009 Lab Events”

Who is online

Users browsing this forum: No registered users and 0 guests