Methods for testing nitrogen in air, methods for testing nitrogen

Let's take a look at these two national standards.

Standard number: GB T 14582-1993

Standard Name: A standard measurement method for radon in ambient air.

Standard Status: Active.

English title: Standard Methods for Radon Measurement in Environmental Air

Date of implementation: 1994-4-1

Promulgating Departments:State Environmental Protection Administration, State Bureau of Technical Supervision.

Brief introduction: This standard specifies four determination methods that can be used to measure radon and its progeny in ambient air, namely track etching method, activated carbon box method, double filter membrane method and balloon method. This standard is applicable to the determination of the potential concentration of Radon-222 and its progeny in indoor and outdoor air.

Standard Name: Air Quality Determination of Nitrogen Oxides.

Standard Status: Active.

Date of implementation: 1993-9-1

Promulgating Departments:State Environmental Protection Administration, State Bureau of Technical Supervision.

Brief introduction: This standard specifies the neutralization titration method for the determination of nitrogen oxides in the exhaust gas of gunpowder smoke in the explosives industry. This standard is applicable to the determination of nitrogen oxides in the exhaust gas of gunpowder smoke in the explosives industry. Derivation.

If the landlord has equipment, it can be detected in the form of compressed gas, and the boiling point of nitrogen is higher than that of other gases in the air, so it is the first to condense when compressed.

1. Stretch the burning magnesium strip (mg) into the gas collector cylinder containing nitrogen, the magnesium strip (mg) will continue to burn, extract the ashes (white powder mg3n2) left from the burn, add a small amount of hot water, and produce gas (ammonia) that turns the wet red litmus test paper blue.

2. Magnesium is burned in nitrogen, and if a light yellow solid (magnesium nitride) is generated, the gas is nitrogen.

1. Alkaline potassium persulfate ultraviolet spectrophotometry (GB 11894-89): such as British RAIKING, China Ruiquan and other brands are mainstream products optimized on the basis of this standard.

2. Gas phase molecular absorption spectrometry: This method is mainly used in laboratories.

3. Ammonia nitrogen, nitrate, and nitrite are also used to measure separately, and then the cumulative value of the results is used as the measurement result of total nitrogen. Typical applications such as the German WTW. In the field of environmental surface water and water quality monitoring, alkaline potassium persulfate ultraviolet spectrophotometry and optimization methods are the main methods at present.

Total nitrogen definition: referred to as TN, is the total amount of inorganic and organic nitrogen in various forms in water. This includes inorganic nitrogen such as NO3-, NO2- and NH4+ and organic nitrogen such as proteins, amino acids, and organic amines, calculated in milligrams of nitrogen per liter of water.

It is often used to indicate the degree to which a body of water is contaminated with nutrients.

Purpose: Total nitrogen content in water is one of the important indicators to measure water quality. Its measurement is useful for evaluating the pollution and self-purification status of water bodies. When the nitrogen and phosphorus substances in the surface water exceed the standard, microorganisms multiply in large quantities, plankton grow vigorously, and eutrophication occurs.