Editing Ammonia

'''Ammonia''', in the aquarium hobby, refers to two chemical compounds, free ammonia (NH3) and ammonium (NH4+) together. Ammonia is a food source for [[nitrifying bacteria]] and is toxic to fish, amphibians and invertebrates. It is a key input to the [[The Nitrogen Cycle]] and an important parameter to measure when [[cycling]] a new tank.

==What is it?==
Free ammonia is a chemical compound of nitrogen and hydrogen with the formula NH3. Technically ammonia in water is called [[w:Ammonium hydroxide|Ammonium hydroxide]]. In the aquarium hobby the term ammonia also refers to an ionized form called ammonium (NH4+). These are held in equilibrium in the water [Citation needed]. '[[Total ammonia]]' (TA) or 'Total ammonia nitrogen' ([[TAN]]) refers to the total concentration of both NH3 and NH4+ in the aquarium water. 

Where you have Ammonia, you will also have Ammonium. The ratio of one to the other varies on pH and water temperature. So it is important to know these two readings when measuring Ammonia in your tank to gauge how serious the Ammonia levels are. See the Links section for a Toxic Ammonia calculator. Here is a table showing the varying levels of ammonia against ammonium.

{| style="text-align:center" cellpadding=9 class="wikitable" border=1 cellspacing=0 style="border:4px"
|+ '''% Percent of ammonia from 'total ammonia''''
|- style="background:#efefef;" 
|Temp C/F || pH 6.5 || pH 7.0 || pH 7.5 ||pH 7.7 || pH 8.0 || pH 8.5
|-
!20C (68F)
|0.125||0.395||1.239||1.95||3.81||11.15
|-
!25C (77F)
|0.179||0.565||1.766||2.77||5.380||15.242
|-
!28C (82F)
|0.221||0.696||2.170||3.396||6.55||18.156
|-
!30C (86F)
|0.253||0.798||2.482||3.78||7.450||20.292
|-
|}

==Sources of Ammonia==
Primary sources:
* Fish excrete ammonia as a waste byproduct of metabolism. In particular, fish excrete free ammonia from their gills and ammonium in their urine. It is suspected invertebrates excrete ammonia in some form as well. The amount of ammonia excreted will vary with amount of food eaten.
* Decaying organic material from dead animals and uneaten food. As the material decomposes, nitrogen is released which is converted into ammonia by bacteria.

Minor sources:
* tap water
* salt mixes

== Testing for Ammonia ==
The concentration of ammonia in water is easily measured with widely available test kits. There are two common methods for measuring ammonia: 
[[Nessler]] measures total ammonia (NH3 and NH4+) <ref>[http://nippyfish.net/2006/08/08/ammonia-test-kits-nessler-vs-salicylate/ Ammonia Test Kits: Nessler vs. Salicylate] </ref> and 
[[Salicylate]] measures free ammonia (NH3) <ref>Ammonia Tests http://www.chemetrics.com/pdf/Ammonia.pdf</ref>. A test kit will use one or both methods. In the marine hobby if a test kit does not explicitly state it measures free ammonia then it is likely uses the Nessler method and measures total ammonia. 

Some [[Water conditioners]] transform free ammonia (NH3) into ammonium (NH4+). As a result, Salicylate test kits will show a decrease in free ammonia while the Nessler test kits will not show any change in total ammonia.

The typical unit of measure is ppm (parts per million). In seawater ppm and mg/L are interchangeably since 1 ppm ammonia = 1.03 mg/L ammonia.

== Toxicity ==
* Free ammonia is highly toxic to aquatic life. It kills in aquariums at very low amounts. Any level above 0.02&nbsp;mg/l (ppm) is considered harmful.

* Ammonium may be toxic to marine fish, especially if the pH differs significantly from natural seawater (e.g. during shipping) <ref>[http://reefkeeping.com/issues/2007-02/rhf/index.php#11 Mechanisms of Ammonia Excretion by Marine Fish]</ref>

* Free ammonia causes gill damage, internal organ damage and eventually skin damage and death. Typical symptoms include:
** ragged or frayed fins
** cloudy eyes
** rapid gilling
** lack of appetite
** more susceptible to disease

*In general, ammonia is more toxic at higher alkaline [[pH]] values and as the temperature of the water increases.

*Ammonia is not toxic to plants in levels that would cause distress to fish, indeed of those plants tested, most preferred ammonia or ammonium as a food to [[nitrate]] <ref>[http://www.aquabotanic.com/plants_and_biological_filtration.htm PLANTS and BIOLOGICAL FILTRATION] by Diana Walstad</ref>.

*Rough guide to toxic levels of free ammonia:
**0.020 to 0.049 (ppm) is considered 'tolerated' but will cause long term harm to its growth, immune system, health, etc. especially to eggs or very young animals. 
**0.050 to 0.199 (ppm) is perhaps tolerated for only a few days and is very harmful.
**0.200 to 0.499 (ppm) is perhaps tolerated for a day or two and will probably kill.
**0.500+ (ppm) is deadly and will probably kill within a day.
**Individual species of fish, amphibians, invertebrates etc. vary enormously on their tolerances of low levels of ammonia and the issue is made further complicated as young are far more susceptible to ammonia than older animals.<ref>US Environmental Protection Agency.  Ambient Water Quality Criteria for Ammonia, (EPA 440/5-85-001) 2009. [http://water.epa.gov/scitech/swguidance/standards/criteria/aqlife/pollutants/ammonia/ammonia_index.cfm]</ref> <ref>Glodek, Garrett S. "Ammonia in the Closed System Aquarium," [http://www.fishchannel.com/fama_portal.aspx FAMA], June 1991.</ref>
**In nitrogen sensitive fish like Trout, ammonia is about 6x more toxic than [[nitrite]] and about 13,300x more toxic than [[nitrate]] <ref>[http://www.barrreport.com/showthread.php/2827-Barr-Report-Newsletter-Fish-Waste-and-Macrophytes?p=15248#post15248 Barr Report (subscription required)] - Fish Waste and Macrophytes paper page 9 - March 2007</ref>

== Removing Ammonia ==

A healthy aquarium should contain enough ammonia consumers to consume all ammonia produced naturally by the system. These consumers come in two forms:
*[[Nitrifying bacteria]] will consume ammonia and convert it to the less toxic [[nitrite]] chemical. However, it can take many weeks to establish the bacteria in large enough quantities in a new tank.
*Plants in a tank will soak up ammonia in order to grow. This works well but can take time.

When detectable levels of ammonia are found, these short term but immediate options are available: 
*Perform a [[water change]]. This dilutes the total ammonia levels quickly and cheaply.
*Add a [[water conditioner]] that neutralizes ammonia. These can be expensive and can cause false readings in some test kits. But are virtually instantaneous in use and less work. <font color=red>Be sure to buy a product that specifically says it detoxifies or neutralizes ammonia. Some [[water conditioners]] may create ammonia as a byproduct of removing [[chlorine]] or [[chloramine]].</font>
*Add special resins or rocks which soak up the ammonia. These are reusable and relatively cheap. Typical resin product names based on [[zeolite]] are Ammo-Chip or Ammo-Carb.
*Ammonia in a freshwater aquarium can be rendered less toxic by adding a small quantity of salt to the water. See [[Salt]] article.
*Some [[algae]] consume ammonia so ammmonia in an aquarium can cause a [[bloom]].

==Sourcing Ammonia==
It is useful to add ammonia to a new tank in order to cycle it before adding any animals. There are products on the market which sell diluted ammonia as a cleaning agent. It is important to only buy a product with no additives (surfactants, perfumes, and colourants, etc.) that may pollute the water with other toxins. Usually the cheapest brands have the lowest additives.

*See article - [[Fishless cycling]] for details.

Typical examples:

*UK - [[Kleen Off]]
*USA - "Pure" Ammonia is sold in the US at WalMart as "Clear Ammonia", and at Ace Hardware as item "10183A Ammonia- Janitorial Strength Formula".
*EU - please add one



==References==
<references/>

== Links ==
*[[w:Ammonia|Ammonia]] by Wikipedia
*[http://www.thekrib.com/Chemistry/ammonia-toxicity.html The Krib] - Ammonia Toxicity to Freshwater Fish
*[http://www.ornamentalfish.org/association/code/quality/ammonia.php Ammonia in aquariums] and safe levels by the OATA
*[http://edis.ifas.ufl.edu/pdffiles/FA/FA03100.pdf Ammonia in Aquatic Systems] by Ruth Francis-Floyd, Craig Watson, Denise Petty, and Deborah B. Pouder of the University of Florida
*[http://web.archive.org/web/20050319163127/http://ce.ecn.purdue.edu/~piwc/w3-research/free-ammonia/derivation.html How to calculate the level of free ammonia at certain pH and temperature in water] by [http://www.ccee.iastate.edu/who-we-are/faculty/james-e-alleman.html Professor James E. Alleman] (Archived link March 2005)
*[http://www.mytriops.com/search/index.php Toxic Free Ammonia level Calculator] (select 'Aquarium Tools' from the list of Tools on the page)
*[http://web.archive.org/web/20101026064403/http://aquanic.org/publicat/usda_rac/efs/srac/463fs.pdf Ammonia in Fish Ponds by Robert M. Durborow, David M. Crosby and Martin W. Brunson. SRAC June 1997] (Archived link)
*[http://www.cnykoi.com/calculators/calcnh3c.asp Koi and Water Garden Society] - Free Ammonia calculator
*[http://www.dataguru.org/misc/aquarium/AmmoniaTox.html Ammonia Toxicity to fish Tables]
*[http://web.archive.org/web/20081225010738/http://equilibriums.beggiatoa.com/ammonia.htm The ammonia/ammonium equilibrium] by Mr. Nielsen. (Archived 2008)

[[Category:Glossary]]