Question

Describe the estimation of nitrogen by Dumas method.

Answer 1

Hint: Before attempting this question one should have prior knowledge of Dumas method, the principles of Dumas method and basic principles of analysis, use this information to approach towards the solution to the question.

Complete step by step solution:
The following method above in the question can be applied to the analysis of total nitrogen in musts and wine within the range of 0 to 100 mg/l
First, what are the principles of Dumas' method?
Absolute nitrogen in an organic matrix can be analyzed using system Dumas which requires a complete matrix combustion submerged under water. The resulting gases are reduced by copper and then removed, when stuck in\[C{O_2}\]. Then, nitrogen is quantified using a universal detail detector
This was the principle of Dumas method now what its principle of analysis
1- Sample and oxygen injection at 940C in a combustion tube
2- Gathering ring combustion brings in temperature temporarily up to 1800 C
3- Complementary oxidation and halogen trapping of cobalt silver and sesquioxide granular chromium
4- Removal of \[{N_2}\]nitrogen oxides and sulfur trapping elements and oxygen by copper at 700C
5- Helium gases includes: \[{N_2}\], \[C{O_2}\] and \[{H_2}O\]with anhydrone (anhydrone granular) magnesium perchlorate and ascarite \[C{O_2}\]
6- Nitrogen and methane separation by chromatography probably current following very extensive testing
7- Detection of katharometer
8- Signal collection and data processing
> Now, the reagents and preparation of reactive solutions are:
1- Nitrogen ( technical quality)
2- Helium (purity 99.99994%)
3- Chromium oxide( chromium sesquioxide in granules )
4- Cobalt oxide
5- Quartz wool
6- Copper
7- Ascarite
8- Anhydrone
9- Oxygen (purity 99.995%)
10- Atropine
11- Glumatic hydric chloride acid
12- Tin boat

> Now, the next step is sampling
Degas by nitrogen bubbling with nitrogen (3.1) for 5 to 10 mn. Mushrooms is centrifuged (4.1) at 10 C For 10mn, at 4200g
Now, we have to see what are operating instructors
Open the apparatus program
1) Put the heating on the apparatus
2) Expressed results are expressed in g/l to the fourth decimal
Results are checked by splicing by mass, temperature, and volume

NOTE: In the above solution we used the concept of Dumas method which is used for calculating molecular weight as a technique used to calculate the molecular weight of an unknown material. The Dumas method is suitable for determining the molecular weight of volatile organic substances at room temperature which are liquids.