What is ISO 20847 - Energy-dispersive X-ray fluorescence spectrometry for Determination of the sulfur content of automotive fuels about?
ISO 20847 specifies an energy dispersive X-ray fluorescence (EDXRF) test method for the determination of the sulfur content of motor gasolines, including those containing up to 2,7 % (m/m) oxygen, and of diesel fuels, including those containing up to 5 % (V/V) fatty acid methyl ester (FAME), having sulfur contents in the range 30 mg/kg to 500 mg/kg.
Other products may be analysed and other sulfur contents may be determined according to this test method; however, no precision data for products other than automotive fuels and for results outside the specified range have been established for ISO 20847.
For reasons of spectral overlap, ISO 20847 is not applicable to leaded motor gasolines, lead-replacement gasolines containing 8 mg/kg potassium to 20 mg/kg potassium, or to products and feedstocks containing lead, silicon, phosporus, calcium, potassium or halides at concentrations greater than one-tenth of the concentration of sulfur measured.
Who is ISO 20847 - Energy-dispersive X-ray fluorescence spectrometry for Determination of the sulfur content of automotive fuels for?
ISO 20847 on energy-dispersive X-ray fluorescence spectrometry for Determination of the sulfur content of automotive fuels is useful for:
- The petroleum industry
- Testing laboratories
- Sampling agencies
- Automotive industry
- Producers and suppliers of gasoline
Why should you use ISO 20847 - Energy-dispersive X-ray fluorescence spectrometry for Determination of the sulfur content of automotive fuels?
Presence of sulfur content in petroleum products or automotive fuels have various impacts on the environmen, emmissions from vehicles and performance of engines. Therefore, dtermining sulfur content of automotive fuels is important.
ISO 20847 is directed specifically at the lower end of the concentration range covered in ISO 8754 ([3] in the Bibliography), which covers sulfur contents from 0,01 % (m/m) up to 5,00 % (m/m). By restriction of instrument type, a better signal to background ratio for sulfur K emission is assured and by the use of matrix matched calibration standards or other means of matrix corrections (as detailed below), the precision and accuracy of results for samples having varying C:H mass ratios and oxygen contents are improved. A knowledge of the general composition of the sample for analysis is advantageous in obtaining the best test result.
Where matrix matching is not used and where the C:H mass ratio of the test sample is known or can be determined, accuracy may be improved by the use of the equation given in ISO 20847 to correct the result to the C:H mass ratio of the calibration standards, i.e. the reference diluent oil.
Some instruments include the capability for the separate measurement of scattered radiation from the X-ray tube, and notes for information are provided in ISO 20847 on the use of this scattered radiation for compensation for matrix effects in the test sample.
ISO 20847 also provides guidelines for measuring low sulfur contents (less than 100 mg/kg), reagents and materials, sampling and sample handling for achieving required qualityof product.
