Theoretical oxygen demand
This article may meet Wikipedia's criteria for speedy deletion because: original research? homework?. For valid criteria, see CSD.
If this article does not meet the criteria for speedy deletion, or you intend to fix it, please remove this notice, but do not remove this notice from pages that you have created yourself. If you created this page and you disagree with the given reason for deletion, you can click the button below and leave a message explaining why you believe it should not be deleted. You can also visit the talk page to check if you have received a response to your message. Note that this article may be deleted at any time if it unquestionably meets the speedy deletion criteria, or if an explanation posted to the talk page is found to be insufficient.
Note to administrators: this article has content on its talk page which should be checked before deletion. Administrators: check links, talk, history (last), and logs before deletion. Consider checking Google.This page was last edited by Mr. Vernon (contribs | logs) at 18:35, 26 December 2008 (UTC) (16 years ago) |
.
This is the calculated amount of oxygen required to oxidise a compound to its final oxidation products. However, there
are some differences between standard methods that can influence the results obtained: for example, some calculations assume that nitrogen
released from organics is generated as ammonia, whereas others allow for ammonia oxidation to nitrate. Therefore in expressing results, the
calculation assumptions should always be stated.
Inorder to determine the ThOD for glycine (CH2 (NH2 )COOH) using the following assumptions:
1. In the first step, the organic carbon and nitrogen are converted to carbon dioxide (CO2 ) and
ammonia (NH3 ), respectively.
2. In the second and third steps, the ammonia is oxidized sequentially to nitrite and nitrate.
3. The ThOD is the sum of the oxygen required for all three steps.
We can calculate by following steps:
1. Write balanced reaction for the carbonaceous oxygen demand.
CH2(NH2)COOH + 1.502 ----->NH3 + 2CO2 + H2 0
2. Write balanced reactions for the nitrogenous oxygen demand.
NH3 + 1.502 -----> HNO2 + H20
HNO2 + 0.5O2 -----> HNO3
NH3 + 2O2 -----> HNO3 + H2O
3. Determine the ThOD.
ThOD = (1.5 + 2) mol O2/mol glycine
= 3.5 mol O2/mol glycine X 32 g/mol O2 X 43 g/mol glycine
= 2.6 g O2/g glycine