CN112858574A - Method for measuring total nitrogen content in desulfurization and denitrification byproducts - Google Patents
Method for measuring total nitrogen content in desulfurization and denitrification byproducts Download PDFInfo
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 59
- 230000023556 desulfurization Effects 0.000 title claims abstract description 59
- 239000006227 byproduct Substances 0.000 title claims abstract description 55
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 27
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims abstract description 38
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 36
- -1 nitrate ions Chemical class 0.000 claims abstract description 27
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 23
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229940010514 ammonium ferrous sulfate Drugs 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 40
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 37
- 238000012360 testing method Methods 0.000 claims description 11
- RWZYAGGXGHYGMB-UHFFFAOYSA-N anthranilic acid Chemical compound NC1=CC=CC=C1C(O)=O RWZYAGGXGHYGMB-UHFFFAOYSA-N 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 6
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 5
- 230000002378 acidificating effect Effects 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 238000004448 titration Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002250 absorbent Substances 0.000 abstract description 5
- 230000002745 absorbent Effects 0.000 abstract description 5
- 239000011575 calcium Substances 0.000 abstract description 5
- 229910052791 calcium Inorganic materials 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 5
- 239000012488 sample solution Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 31
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 20
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 8
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 6
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 4
- 235000010261 calcium sulphite Nutrition 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 description 1
- 229940039790 sodium oxalate Drugs 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The application discloses a method for measuring total nitrogen content in desulfurization and denitrification byproducts, and belongs to the field of chemical technical analysis. Adding excessive hydrogen peroxide solution into the desulfurization and denitrification byproducts, and heating and oxidizing at 80-120 ℃; cooling and then adjusting the pH value to be alkaline; heating until the volume of the sample solution is 5-10 mL, adjusting the pH value to acidity, reducing nitrate ions by using excessive ammonium ferrous sulfate, titrating the remaining ammonium ferrous sulfate by using potassium dichromate, and obtaining the total nitrogen content in the desulfurization and denitrification byproducts according to the volume of the consumed potassium dichromate. The method can accurately measure the total nitrogen content in the desulfurization and denitrification byproducts, overcomes the defect of low measurement time of the traditional total nitrogen content, and provides reliable data for the research of the desulfurization and denitrification process and the calculation of the utilization rate and the denitrification rate of the calcium-based absorbent.
Description
Technical Field
The application belongs to the field of chemical technical analysis, and particularly relates to a method for measuring total nitrogen content in desulfurization and denitrification byproducts.
Background
The sintering flue gas is the main source of nitrogen oxide and sulfur dioxide in the steel industry, most of the nitrogen oxide in the sintering flue gas is nitric oxide, the nitric oxide is insoluble in water, the nitric oxide is required to be firstly oxidized into high-price nitrogen oxide in the denitration process, and then the alkaline substance is utilized to absorb the nitrogen oxide, so that the desulfurization and denitration of the sintering flue gas are realized. The commonly adopted alkaline substance is a calcium-based absorbent, the desulfurization and denitrification by-products have complex components, and the main components comprise calcium nitrite, calcium nitrate, calcium sulfite, calcium sulfate, calcium carbonate, calcium hydroxide and the like. The accurate determination of the total nitrogen content in the desulfurization and denitrification byproducts provides reliable data support for research of a denitrification process and calculation of the utilization rate and denitrification rate of the calcium-based absorbent.
The total nitrogen content in the desulfurization and denitrification byproducts needs to be accurately measured. Nitrite ions are easy to oxidize sulfite ions under acidic conditions, and the nitrite ions are reduced into nitric oxide gas to escape, so that the detection of the total nitrogen content in the desulfurization and denitrification byproducts is influenced. The content of calcium nitrite is generally oxidized by excessive potassium permanganate and then titrated by sodium oxalate, and the method does not consider that calcium sulfite can also react with potassium permanganate, so that the content of calcium nitrite is increased; the content of calcium nitrate generally utilizes the oxidation performance of calcium nitrate, nitrate ions are directly reduced by ammonium ferrous sulfate under acidic conditions, and the method does not consider that the reducibility of sulfite ions in a desulfurization and denitrification by-product sample can influence the detection of the total nitrogen content.
Disclosure of Invention
The invention aims to provide a method for measuring the total nitrogen content in a desulfurization and denitrification byproduct, so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
fully oxidizing nitrite ions in the desulfurization and denitrification byproducts into nitrate ions by using hydrogen peroxide, respectively measuring the total content of the nitrate ions in the desulfurization and denitrification byproducts, and calculating the total nitrogen content in the desulfurization and denitrification byproducts; the testing steps are as follows:
step 1: and (3) pretreating the sample, namely weighing the sample with the mass m, adding an excessive hydrogen peroxide solution, uniformly shaking, adding a sulfuric acid solution, and heating at 80-120 ℃ for 20min to oxidize nitrite ions in the desulfurization and denitrification byproducts into nitrate ions.
NO2-+H2O2＝NO3 -+H2O
And after the oxidation reaction is finished, adding an alkali solution into the sample, adjusting the pH value of the sample to be alkaline, heating and evaporating until the volume of the sample solution is 5-10 mL, decomposing the excessive hydrogen peroxide solution, cooling, and adding 5-10 mL of water.
H2O2+2OH-＝2H2O+O2↑
Step 2: and (2) performing analysis and test, namely adding sulfuric acid into a sample to adjust the pH value of the sample to be acidic, then adding excessive ammonium ferrous sulfate solution and concentrated sulfuric acid, wherein the concentration of ammonium ferrous sulfate is c, the addition volume of ammonium ferrous sulfate is V, heating the sample until the solution is bright yellow, enabling nitrate ions to oxidize ferrous ions, adding an indicator, titrating the excessive ferrous ions by using potassium dichromate solution, wherein the concentration of the potassium dichromate solution is c1, and the titration volume of the potassium dichromate solution is V1, so that the total nitrogen content in the desulfurization and denitrification byproducts can be obtained.
NO3 -+3Fe2++4H+＝NO↑+3Fe3++2H2O
Cr2O7 -+6Fe2++14H+＝2Cr3++6Fe3++7H2O
And step 3: theoretically calculating, the total content of nitrogen in the desulfurization and denitrification byproducts is as follows:
in the test, X is the content of nitrogen in the desulfurization and denitrification by-product, and 14 is the atomic mass of N.
Further, the mass of the desulfurization and denitrification byproduct sample in the step 1 is 0.2-0.5 g;
further, the sulfuric acid in the step 1 and the step 2 is a sulfuric acid (1+3) aqueous solution, and the volume of the added sulfuric acid solution is 1-2 mL; the alkaline solution is 100g/L potassium hydroxide solution, and the added volume is 5-10 mL.
Further, the indicator in step 2 is 0.2% N-And (3) adding 3-5 drops of a phenylated anthranilic acid solution, and titrating the potassium dichromate solution until the sample is purple.
Compared with the prior art, the invention has at least the following beneficial effects:
the determination method adopts the technical scheme of combining the hydrogen peroxide oxidation pretreatment and the oxidation-reduction method. And excessive hydrogen peroxide is used for oxidizing reductive substances such as calcium nitrite and calcium sulfite in the desulfurization and denitrification byproducts, so that the influence of the calcium sulfite on the total nitrogen content is avoided, and the residual hydrogen peroxide can be decomposed into water and oxygen to escape after the pH value of the hydrogen peroxide is adjusted by the alkali solution, so that the influence of the oxidation performance of the hydrogen peroxide on the measurement of the total nitrogen content in the later period is prevented. After the pre-oxidation treatment by hydrogen peroxide, reducing calcium nitrate in the sample solution by using excessive ammonium ferrous sulfate under the condition of concentrated sulfuric acid, titrating the residual ammonium ferrous sulfate by using potassium dichromate, and obtaining the total nitrogen content by the volume consumed by the potassium dichromate. The method can accurately measure the total nitrogen content in the desulfurization and denitrification byproducts, overcomes the defect of low measurement time of the traditional total nitrogen content, and provides reliable data support for the research of the desulfurization and denitrification process and the calculation of the utilization rate and the denitrification rate of the calcium-based absorbent.
Detailed Description
Fully oxidizing nitrite ions in the desulfurization and denitrification byproducts into nitrate ions by using hydrogen peroxide, respectively measuring the total content of the nitrate ions in the desulfurization and denitrification byproducts, and calculating the total nitrogen content in the desulfurization and denitrification byproducts; the testing steps are as follows:
step 1: pretreating a sample, weighing a desulfurization and denitrification byproduct sample with the mass of m, adding an excessive hydrogen peroxide solution, uniformly shaking, adding a sulfuric acid solution, wherein the sulfuric acid is a sulfuric acid (1+3) aqueous solution, the volume of the added sulfuric acid solution is 1-2 mL, and heating at 80-120 ℃ for 20min to oxidize nitrite ions in the desulfurization and denitrification byproduct into nitrate ions, wherein the mass of the desulfurization and denitrification byproduct sample is 0.2-0.5 g.
NO2-+H2O2＝NO3 -+H2O
After the oxidation reaction is finished, adding an alkali solution into the sample, adjusting the pH value of the sample to be alkaline, heating and evaporating until the volume of the sample solution is 5-10 mL, decomposing the excessive hydrogen peroxide solution, cooling, and adding 5-10 mL of water, wherein the alkali solution is 100g/L of potassium hydroxide solution, and the added volume is 5-10 mL.
H2O2+2OH-＝2H2O+O2↑
Step 2: analyzing and testing, adding sulfuric acid into a sample to adjust the pH value of the sample to be acidic, then adding excessive ammonium ferrous sulfate solution and concentrated sulfuric acid, wherein the concentration of ammonium ferrous sulfate is c, the addition volume of ammonium ferrous sulfate is V, heating the sample until the solution is bright yellow, enabling nitrate ions to oxidize ferrous ions, adding an indicator, titrating the excessive ferrous ions by potassium dichromate solution, the concentration of the potassium dichromate solution is c1, the titration volume of the potassium dichromate solution is V1, and obtaining the total nitrogen content in the desulfurization and denitrification byproducts, wherein the indicator is N with the concentration of 0.2 percent-And (3) adding 3-5 drops of a phenylated anthranilic acid solution, and titrating the potassium dichromate solution until the sample is purple.
NO3 -+3Fe2++4H+＝NO↑+3Fe3++2H2O
Cr2O7 -+6Fe2++14H+＝2Cr3++6Fe3++7H2O
And step 3: theoretically calculating, the total content of nitrogen in the desulfurization and denitrification byproducts is as follows:
in the test, X is the content of nitrogen in the desulfurization and denitrification by-product, and 14 is the atomic mass of N.
Examples
The present invention is described in further detail below with reference to specific examples, which should not be construed as limiting the invention.
Fully oxidizing nitrite ions in the desulfurization and denitrification byproducts into nitrate ions by using hydrogen peroxide, respectively measuring the total content of the nitrate ions in the desulfurization and denitrification byproducts, and calculating the total nitrogen content in the desulfurization and denitrification byproducts; the testing steps are as follows:
step 1: pretreating a sample, weighing 0.2g of desulfurization and denitrification by-product sample 1, sample 2 and sample 3, adding 20mL of 3% hydrogen peroxide solution into the sample, shaking uniformly, adding 1mL of sulfuric acid (1+3) solution, heating at 80-120 ℃ for 20min to fully oxidize nitrite ions and sulfite ions in the desulfurization and denitrification by-product into nitrate ions and sulfate ions
NO2 -+H2O2＝NO3 -+H2O
SO3 2-+H2O2＝SO4 2-+H2O
After the oxidation reaction is finished, cooling, adding 10mL of potassium hydroxide solution (100g/L) into the sample, adjusting the sample to be alkaline, heating and evaporating until the volume of the sample solution is 5-10 mL, decomposing the excessive hydrogen peroxide solution, cooling the sample, adding 5-10 mL of water,
H2O2+2OH-＝2H2O+O2↑
step 2: the analysis and test are carried out, 1mL of sulfuric acid (1+3) solution is added into the sample to adjust the sample to acidity, then 50mL of ferrous ammonium sulfate solution with the concentration of c 0.05mol/L and 30mL of concentrated sulfuric acid are added, the sample is heated to bright yellow, nitrate radical iron oxide ions are caused to be in bright yellow, excessive ferrous ammonium sulfate is titrated by potassium dichromate solution, and the concentration of the potassium dichromate solution is that
The titration volume of the potassium dichromate solution is V1, and the total nitrogen content in the desulfurization and denitrification byproducts can be obtained.
NO3 -+3Fe2++4H+＝NO+3Fe3++2H2O
Cr2O7 -+6Fe2++14H+＝2Cr3++6Fe3++7H2O
And step 3: theoretically calculating, the total content of nitrogen in the desulfurization and denitrification byproducts is as follows:
in the test, X is the content of nitrogen in the desulfurization and denitrification byproducts, and 14 is the atomic mass of N.
TABLE 1 measurement of Total Nitrogen content of three samples
| Sample number | 1 | 2 | 3 |
| Total nitrogen content/%) | 1.20 | 1.08 | 1.35 |
In conclusion, the method provided by the embodiment can be used for accurately measuring the total nitrogen content in the desulfurization and denitrification byproducts, overcomes the defect of low measurement time of the conventional total nitrogen content, and provides reliable data support for the research of desulfurization and denitrification processes and the calculation of the utilization rate and denitrification rate of the calcium-based absorbent.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (5)
1. A method for measuring the total nitrogen content in a desulfurization and denitrification byproduct is characterized in that nitrite ions in the desulfurization and denitrification byproduct are fully oxidized into nitrate ions by hydrogen peroxide, the total content of the nitrate ions in the desulfurization and denitrification byproduct is respectively measured, and the total nitrogen content in the desulfurization and denitrification byproduct is calculated, wherein the method comprises the following test steps:
step 1: pretreating a sample, weighing a desulfurization and denitrification by-product sample with the mass m, adding an excessive hydrogen peroxide solution, uniformly shaking, adding a sulfuric acid solution, and heating at 80-120 ℃ for 20min to oxidize nitrite ions in the desulfurization and denitrification by-products into nitrate ions;
after the oxidation reaction is finished, adding an alkali solution into the sample, adjusting the pH value of the sample to be alkaline, heating and evaporating to be nearly dry, decomposing the excessive hydrogen peroxide solution, cooling, and adding 5-10 mL of water;
step 2: the method comprises the following steps of performing analytical test, namely adding sulfuric acid into a sample to adjust the pH value of the sample to be acidic, then adding excessive ammonium ferrous sulfate solution and concentrated sulfuric acid, wherein the concentration of ammonium ferrous sulfate is c, the addition volume of ammonium ferrous sulfate is V, heating the sample until the solution is bright yellow, enabling nitrate ions to oxidize ferrous ions, adding an indicator, titrating the excessive ferrous ions with potassium dichromate solution, wherein the concentration of the potassium dichromate solution is c1, and the titration volume of the potassium dichromate solution is V1, so that the total nitrogen content in the desulfurization and denitrification byproducts can be obtained;
and step 3: theoretically calculating, the total content of nitrogen in the desulfurization and denitrification byproducts is as follows:
in the test, X is the content of nitrogen in the desulfurization and denitrification by-product, and 14 is the atomic mass of N.
2. The method for determining the total nitrogen content in the desulfurization and denitrification byproduct as claimed in claim 1, wherein the method comprises the following steps: in the step 1, the mass m of the desulfurization and denitrification byproduct sample is 0.2-0.5 g.
3. The method for determining the total nitrogen content in the desulfurization and denitrification byproduct as claimed in claim 1, wherein the method comprises the following steps: the volume of the sulfuric acid (1+3) aqueous solution added into the sulfuric acid in the step 1 and the step 2 is 1-2 mL.
4. The method for determining the total nitrogen content in the desulfurization and denitrification byproducts as claimed in claim 1, wherein the alkali solution in step 1 is a potassium hydroxide solution, the concentration of the potassium hydroxide solution is 100g/L, and the added volume is 5-10 mL.
5. The method for determining the total nitrogen content in the desulfurization and denitrification byproduct as claimed in claim 1, wherein the method comprises the following steps: and in the step 2, the indicator is N-phenylated anthranilic acid solution, the concentration of the N-phenylated anthranilic acid solution is 0.2%, the volume of the N-phenylated anthranilic acid solution is 3-5 drops, and the potassium dichromate solution is titrated until the sample is purple.
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