what exactly is the difference between NO3-N and just plain NO3. Ingrid


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wrote in message
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what exactly is the difference between NO3-N and just plain NO3. Ingrid


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I'm not sure what you mean. NO3 with a minus sign is the nitrate ion.
There is no such thing as NO3 (without the charge) in water.

Is'nt it representing the different cycles of ammonia.

Ammonia/Ammonium? = N
No2 = the second step in the Nitrogen cycle (Nitrite)
No3 = Last step....(Nitrate)

I think thats it but I have been known to misquote :-)
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wrote in message
...
what exactly is the difference between NO3-N and just plain NO3. Ingrid


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Solve the problem, dont waste energy finding who's to blame
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Unfortunately, I receive no money, gifts, discounts or other
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"Happy'Cam'per" wrote:

Ammonia/Ammonium? = N

Ammonia is NH3

The Ammonium ion is NH4+

Ammonium hydroxide is NH4+ OH-

Nitrogen gas is N2

Ammonia \Am*mo"ni*a\, n. [From sal ammoniac, which was first
obtaining near the temple of Jupiter Ammon, by burning
camel's dung. See {Ammoniac}.] (Chem.)
A gaseous compound of hydrogen and nitrogen, {NH3}, with a
pungent smell and taste: -- often called {volatile alkali},
and {spirits of hartshorn}.

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So N is then Nitrogen?
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**So long, and thanks for all the fish!**

"Stephen Henning" wrote in message
news
"Happy'Cam'per" wrote:

Ammonia/Ammonium? = N

Ammonia is NH3

The Ammonium ion is NH4+

Ammonium hydroxide is NH4+ OH-

Nitrogen gas is N2

Ammonia \Am*mo"ni*a\, n. [From sal ammoniac, which was first
obtaining near the temple of Jupiter Ammon, by burning
camel's dung. See {Ammoniac}.] (Chem.)
A gaseous compound of hydrogen and nitrogen, {NH3}, with a
pungent smell and taste: -- often called {volatile alkali},
and {spirits of hartshorn}.

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Pardon my spam deterrent; send email to
Cheers, Steve Henning in Reading, PA USA
http://home.earthlink.net/~rhodyman

hey... I went all the way thru quantitative analysis and dissociation constants
(twice yet). what I need is Rod Farley or a real chemist... isnt somebody's husband
a chemist on this list? I done all the searches and have come up with the standard
"total nitrogen" thing, now I want it explained in more detail and WHY they use this
way of expressing it when they werent doing that 20 years ago when I took the damn
chem course. Ingrid



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.

wrote:

a chemist on this list? I done all the searches and have come up with the
standard "total nitrogen" thing, now I want it explained in more detail
and WHY they use this way of expressing it when they werent doing that 20
years ago when I took the damn

Who's "they"? When I've seen NO3-N, I thought it was just an indicator of
the Nitrate - Nitrogen pathway, not a molecular notation.
--
derek

wrote in
:

hey... I went all the way thru quantitative analysis and dissociation
constants (twice yet). what I need is Rod Farley or a real chemist...
isnt somebody's husband a chemist on this list? I done all the
searches and have come up with the standard "total nitrogen" thing,
now I want it explained in more detail and WHY they use this way of
expressing it when they werent doing that 20 years ago when I took the
damn chem course. Ingrid



NO3-N is a term used by environmental chemists as well as (as someone has
already said) in agriculture. It's not new - it was certainly in common
use in the '70's when I was involved in drinking water quality and I'm
pretty sure it dates back to the start of the 20th century or before.

It is used because there can be several different nitrogen compounds (eg
ammonia, nitrite, nitrate or albumoid compounds) which have diffrent
proportions of nitrogen in them. Often it is OK just to express the
concentration of that compound in the usual way - eg mg NH3 per litre, or
mg NO3 per litre. But they contain very different amounts of nitrogen. So
whereas 1 mg NO3 contains only about 0.2 mg nitrogen, 1 mg NH3 contains
0.8 mg nitrogen.

So when the amount of nitrogen is more important than the amount of the
compound it is usual to convert all concentrations to the equivalent
amount of nitrogen. So 1 mg/l NO3-N means 1mg/l of nitrogen which happens
to be in the form of nitrate, and this represents exactly the same amount
of nitrogen as 1 mg/l NH3-N, or alb-N, or NO2-N, etc.

Similarly, if you are spreading it on a field, 1 kilogram NO3-N will
provide the same amount of available nitrogen as 1 kilogram NH3-N.

Hope this helps.

Cuvapu

So N is then Nitrogen?
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**So long, and thanks for all the fish!**

"Stephen Henning" wrote in message
news
"Happy'Cam'per" wrote:

Ammonia/Ammonium? = N

Ammonia is NH3

The Ammonium ion is NH4+

Ammonium hydroxide is NH4+ OH-

Nitrogen gas is N2

Ammonia \Am*mo"ni*a\, n. [From sal ammoniac, which was first
obtaining near the temple of Jupiter Ammon, by burning
camel's dung. See {Ammoniac}.] (Chem.)
A gaseous compound of hydrogen and nitrogen, {NH3}, with a
pungent smell and taste: -- often called {volatile alkali},
and {spirits of hartshorn}.

--
Pardon my spam deterrent; send email to
Cheers, Steve Henning in Reading, PA USA
http://home.earthlink.net/~rhodyman