The “ASTM D3242-01 Standard test method for acidity in aviation turbine fuel” developed by the American Society for Testing and Materials (ASTM) describes a test method for determining the acidity in aviation turbine fuel in the range of 0,000 to 0,100 mg KOH/g.
For the purposes of this standard, the acid number is the amount of a specified base, expressed in milligrams of potassium hydroxide per gram of sample, required to titrate a sample in a specified solvent to a specified end point using a specified detection system. In this test method the solvent is a toluene-water-isopropanol mixture and the end point is determined when a green/green brown color is achieved using the specified p-naphtholbenzeine indicator solution.
When testing, the sample is dissolved in a mixture of toluene and isopropyl alcohol with a small amount of water. The resulting single-phase solution is coated with a bubbling stream of nitrogen and titrated with standard alcoholic potassium hydroxide to the end point indicated by the color change of the added p-naphtholbenzeine solution (orange in acid and green in base).
Some acids may be present in aviation turbine fuels due to acid treatment during the refining process or from naturally occurring organic acids. Significant acid contamination is unlikely to be present due to the many control tests carried out at various stages of refining. However, trace amounts of acid may be present and are undesirable due to their tendency to corrode metals with which the fuel comes into contact or to impair the water separation properties of aviation turbine fuel.
This test method is designed to measure acidity levels that may be present in aviation turbine fuel and is not suitable for determining significant acid contamination.
These tests use a 0,1 mL burette subdivided by 25 mL or a 0,05 mL burette subdivided by 10 mL. An automatic burette capable of delivering tirant amounts in increments of 0,05 mL or less may be used, but the stated precision data were obtained using manual burettes only.
Reagent grade chemicals are used in all tests. Unless otherwise stated, all reagents are intended to conform to the specifications of the American Chemical Society Committee on Analytical Reagents. Other grades may also be used, provided that the reagent is first determined to have: purity high enough to permit its use without reducing the accuracy of the detection.
The purity of the water is evaluated in accordance with the standard “ASTM D1193-06 Standard specification for reactive water”. The p-naphtholbenzeine indicator solution must meet the specifications given in the standard annex. It must be nitrogen, dry type and carbon dioxide free. It is a compressed gas under high pressure, reducing the oxygen available for breathing.
In short, tests are carried out according to the ASTM D3242-01 standard to find trace amounts of acid in jet fuel that may disrupt the water separation properties of the fuel and cause corrosion. Some acids may be present in aviation turbine fuels due to acid treatment or naturally occurring organic acids during the refining process. Significant acid contamination is unlikely due to the many control tests performed during the refining process. However, trace amounts of acid are undesirable because they can impair the water separation properties of aviation turbine fuel and cause the fuel to corrode metals. According to that standard, acidity determines the acidity in aviation turbine fuel in the range of 0,000 to 0,100 mg KOH/g.
Among the numerous testing, measurement, analysis and evaluation studies it provides for businesses in various sectors, our organization also provides testing services defined in the "ASTM D3242-01 Standard test method for acidity in aviation turbine fuel" standard, with a trained and expert staff and advanced technological equipment.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
