Need help with some bio questions. cant seem to find answers

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Niko
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Need help with some bio questions. cant seem to find answers

Post by Niko » Tue Sep 27, 2005 10:24 pm

my bio teacher wants me to research these questions on the internet and i cant find answers:

what are normal values of ph in a freshwater community?

what are normal values of dissolved oxygen in a fresh water community?

where do nitrates come from, and can they be harmful or helpful in a freshwater community? why?

Niko
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Re: Need help with some bio questions. cant seem to find ans

Post by Niko » Tue Sep 27, 2005 11:08 pm

Niko wrote:my bio teacher wants me to research these questions on the internet and i cant find answers:

what are normal values of ph in a freshwater community?

what are normal values of dissolved oxygen in a fresh water community?

where do nitrates come from, and can they be harmful or helpful in a freshwater community? why?


Got the last one... now just the first two...

NiamhC
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Post by NiamhC » Tue Sep 27, 2005 11:29 pm

Most sources i can find seem to have the acceptable levels of pH in freshwater as between 6.5 and 8.5, with 7.0 being neutral.

Also, from what i can see the oxegen levels are about 8ppm.

Just google: pH levels, freshwater
and Dissolves Oxegen, freshwater

and you should find some pages that'll help you out.

Niko
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Post by Niko » Thu Sep 29, 2005 12:09 am

NiamhC wrote:Most sources i can find seem to have the acceptable levels of pH in freshwater as between 6.5 and 8.5, with 7.0 being neutral.

Also, from what i can see the oxegen levels are about 8ppm.

Just google: pH levels, freshwater
and Dissolves Oxegen, freshwater

and you should find some pages that'll help you out.


Thanks so much!!! right on time, too. thoses were the only ones i hasd left and the assignment was rue tommorrow!! :)

paperclip
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Nitrate levels

Post by paperclip » Thu Sep 29, 2005 7:00 am

How about the buffering capacity of hydrocarbonates in fresh water samples, not to mention the effects of metallic cations and metallic anions? like how about sulphates too?

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Jokkon
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Post by Jokkon » Fri Sep 30, 2005 2:51 am

do nitrates come from algae? i think i learned aobut that a few years back
I am just a high school student

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mith
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Post by mith » Fri Sep 30, 2005 3:34 am

No, algae uses nitrates and profilerates where nitrates exist. You're confusing cause and effect.
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Accepting hardships as the pathway to peace;
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