Sulfur determination in petroleum and petroleum products ISO 20847-2010

The test method is developed in accordance with  EN ISO 20847:2004 "Petroleum products - Determination of sulfur content of automotive fuels - Energy-dispersive X-ray fluorescence spectrometry".
ISO 20847:2004 specifies an energy dispersive X-ray fluorescence (EDXRF) test method for the determination of the sulfur content of motor gasoline, including that containing up to 2,7 % (m/m) oxygen, and of diesel fuels, including those containing up to 5 % (V/V) fatty acid methylester (FAME), having sulfur contents in the range 30 mg/kg to 500 mg/kg.
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The standard pays special attention to the lower end of the concentration range covered by ISO 8754, which specifies sulfur contents determination from 0.01 mass % up to 5.00 mass %.
ISO 20847:2004 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, phosphorus, calcium, potassium or halides at concentrations greater than one-tenth of the concentration of sulfur measured.

No sample preparation is required for analysis.
The sample in a sample cup is exposed to primary X-ray tube emission in spectrometer. Countrate of S-Kα emission is measured. Sulfur content is determined with calibration curve for the given concentration range.

The method specifies sulfur determination in in the range 30 mg/kg to 500 mg/kg with the following precision parameters:
The precision, as determined by statistical examination of interlaboratory test results on eight motor gasoline samples and seven diesel samples.

Repeatability r
The difference between two test results obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, in the normal and correct operation of the test method, exceed the following values in only one case in 20.
for motor gasolines   r=0.0312X+9;
for diesel fuels  r=0.0188X+8,
where  X  is the average of results being compared, in mg/kg

Reproducebility R

The difference between two single and independent test results obtained by different operators working in different laboratories on identical test material would, in a long run, in normal and correct operation of the test method, exceed the following values in only one case in 20.
For motor gasoline : R=0.1116X+11;
for diesel fuel: R=0.0169X+12,
where  X is the average of the results being compared, in mg/kg.

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