https://www.theaquariumwiki.com/w/index.php?title=Carbon_dioxide&feed=atom&action=historyCarbon dioxide - Revision history2024-03-29T13:53:42ZRevision history for this page on the wikiMediaWiki 1.29.2https://www.theaquariumwiki.com/w/index.php?title=Carbon_dioxide&diff=64651&oldid=prevPsiProBot: clean up, replaced: [http://en.wikipedia.org/wiki/Photosynthesis photosynthesis] → photosynthesis (2)2011-02-24T04:45:14Z<p>clean up, replaced: [http://en.wikipedia.org/wiki/Photosynthesis photosynthesis] → <a href="http://en.wikipedia.org/wiki/Photosynthesis" class="extiw" title="w:Photosynthesis">photosynthesis</a> (2)</p>
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'''Carbon dioxide ({{CO2}})'''<br />
<br />
Also called Carbonic acid gas, Carbonic anhydride, dry ice (when solid).<br />
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This is a gas given off by all plants at night. <br />
{{CO2}} is absorbed by plants during [[w:Photosynthesis|photosynthesis]].<br />
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*{{CO2}} when mixed with water becomes [[carbonic acid]] ({{H2CO3}}).<br />
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*{{CO2}} dissolves quite easily in water but is also easily removed by water agitation.<br />
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*If you wish to grow plants well in an aquarium you may need to add {{CO2}} to the water.<br />
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It is often considered that a {{CO2}} value of 15ppm is required in the aquarium to grow plants successfully.<br />
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== Measuring {{CO2}} in your tank ==<br />
There are several methods of measuring the level of carbon dioxide in the water.<br />
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*The most popular way is by the measurement of the [[pH]] and [[KH]] values of your tank water then you can find out the level of dissolved {{CO2}} by reading from a graph. This method will yield inaccurate results if there are any acids other than carbonic acid in the water.<br />
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=== Graph ===<br />
[[Image:CO2 Graph.gif|300px]]<br />
[[Image:CO2 chart1.png|300px]]<br />
*Excel Spreadsheet of {{CO2}} Chart is available [http://theaquariumwiki.com/aqw_files/CO2%20levels.xls here].<br />
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*By the use of a {{CO2}} glass bubble (also called a {{CO2}} indicator or {{CO2}} bubble tester) submerged under water.<br />
This glass bubble contains a small amount of liquid chemical (a 4 [[KH]] reference liquid containing [[Bromothymol blue]]) and you place in it a few drops of distilled water and then submerse it and attach it to the inside of your tank. The liquid turns either blue for too little {{CO2}}, green for the ideal amount and red too much. One end of the bubble is open to the water and so {{CO2}} in the water disperses slowly into the chemical therefore displaying the colour. (Process takes about 60–120 minutes). <br />
*Note don't place aquarium water in the bubble if you have high [[phosphate]] levels or [[bogwood|wood]] in your aquarium as these lower the pH and therefore will lead you to read higher levels of {{CO2}} than there are in the water.<br />
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[[Image:Aquili CO2 test.jpg|thumb|left|AQuili {{CO2}} tester]]<br />
[[Image:ADA CO2 test.jpg|thumb|left|ADA {{CO2}} tester]]<br />
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*By using a commercial {{CO2}} test kit.<br />
There are many of these test kits on the market. Some of these kits use the pH-KH relationship described above and so are subject to the same inaccurate readings if acids other than carbonic acid are present in the tank water. See [http://www.thekrib.com/Plants/CO2/test-kits.html The Krib on {{CO2}} Test kits] for more information on how they work.<br />
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*See [[CO2 testing|{{CO2}} testing]] article.<br />
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== Links ==<br />
*[[w:Carbon dioxide|Wikipedia on {{CO2}}]]<br />
*[http://www.qsl.net/w2wdx/aquaria/diyCO2.html DIY {{CO2}} Systems by John LeVasseur]<br />
*[http://www.thekrib.com/Plants/CO2/ The Krib on {{CO2}}]<br />
*[http://www.geocities.com/Heartland/Hills/2637/DIY_CO2.html DIY {{CO2}} using Yeast]<br />
*[http://faq.thekrib.com/plant-CO2.html {{CO2}} in the Aquarium]<br />
*[http://www.geocities.com/Heartland/Hills/2637/press_CO2.html Pressurised {{CO2}} system]<br />
*[http://web.archive.org/web/20050314085538/http://www.qsl.net/w2wdx/aquaria/diyCO2.html A Treatise on DIY {{CO2}} Systems]<br />
*[http://www.calaqualabs.com/doublecheck.html {{CO2}} Checker with {{CO2}} 30ppm reference]<br />
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*Read the [[Yeast]] article. and its links for CO<sub>2</sub> generation using Yeast.<br />
[[Category:Glossary]]<br />
[[Category:Plant food]]<br />
[[Category:Glossary - Plants]]<br />
[[Category:Water conditioners]]<br />
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