Standards Development
The method is directly applicable to the determination of low concentrations (2 mg/kg to 100 mg/kg) of organic halogen in petroleum products such as gasolines, middle distillates, marine fuels and residual fuels. The method can also be applied to crude oils; however, no precision data have been established for this additional product type.
Except for fluorine (F), the organic halogens chlorine (Cl), bromine (Br), and iodine (I) that may be present in the sample are determined quantitatively. The halogen is reported as the equivalent number of chloride ions. A sample preparation is described for the removal of inorganic halides from residual fuels before the determination of the organic halogen content. This procedure is essential to obtain a result of organic halogen only.
The methodology used is based on oxidative coulometry or ion chromatography.
NEN would like to initiate a coordinated test method development in ISO (and CEN) that measures what is specified for halogens in (bio- and alternative) fuel products. A combined effort to target a mutually agreed scope (products and measurement range) is required. CEN/TC 19/WG 27 and ISO/TC 28/WG 24 need to discuss the global and European establishment of standard(s) for the test procedures MC, XRF coulometry and CIC. Coordination on an ILS is also required. We therefore ask ISO/TC 28/WG 24 to discuss feasibility of the establishing of the necessary test method standards, the definition of the required measurement range and the related bias study amongst the three or four techniques.
See enclosure for more information. In addition, we would recommend combining this with the XRF detector technique being already develop by ISO/TC 28/WG 24. Either in one method with different procedures or with different parts. Note: in case the WI is based on documents from other organizations than ISO/IEC, please specify it here
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