EN ISO 659:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagent
6 Apparatus
7 Sampling
8 Preparation of test sample
   8.1 Reduction of laboratory sample
   8.2 Predrying
   8.3 Test sample
9 Procedure
   9.1 General
   9.2 Test portion
   9.3 Determination
   9.4 "Oil content" of impurities
10 Expression of results
   10.1 Method of calculation
11 Precision
   11.1 Interlaboratory test programme
   11.2 Repeatability
   11.3 Reproducibility
12 Test report
Annex A (informative) - Results of interlaboratory tests on
        the determination of oil content
Bibliography

ISO 659:2009 specifies a reference method for the determination of the hexane extract (or light petroleum extract), called the “oil content”, of oilseeds used as industrial raw materials. The procedure for sunflower seed is different from those for other seeds as it includes an additional moisture content determination after the seed has been ground to prepare the test sample.The method has been tested on rapeseed, soya beans and sunflower seed. This does not, however, preclude its applicability to other commercial seeds.If required, the pure seeds and the impurities can be analysed separately. In the case of groundnuts, the pure seeds, the total fines, the non-oleaginous impurities and the oleaginous impurities can be analysed separately.