ISO INTERNATIONAL STANDARD 3735 Second edition 1999-03-15 Crude petroleum and fuel oils Determination of sediment Extraction method Pétrole brut et fuel-oils Détermination de la teneur en sédiments - Méthode par extraction ISO Reference number ISO 3735:1999(E) ISO3735:1999(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3735 was developed by Technical Committee TC 28, Petroleum products and lubricants, Subcommittee 6, Bulk cargo transfer, accountability, inspection and reconciliation. This second edition cancels and replaces the first edition (isO 3735:1975), of which it constitutes a technica revision. @ISO1999 International Organization for Standardization Case postale 56·CH-1211Geneve 20·Switzerland Internet [email protected] Printed in Switzerland ii INTERNATIONAL STANDARD @ISO ISO3735:1999(E) Crude petroleum and fuel oils Determination of sediment Extraction method WARNING - The use of this International Standard may involve hazardous materials, operations and and health practices and determine the applicability of regulatory limitations prior to use 1 Scope extraction with toluene. The precision applies to a range of sediment levels from 0,01 % (m/m) to 0,40 % (m/m), although higher levels may be determined. NOTE 1 If this International Standard is applied to crude petroleum samples containing significant amounts of salts, ar overestimationofthesedimentcontentmaybeobtainedbecause proportion of the inorganic salts may /betrappedinthe extraction thimble. This problem is generally not significant for crude petroleum samples containing less than 0,1 % (m/m) total salts NOTE 2 For the purposes of this International Standard, the terms "% (m/m)" and "% (V/V)" are used to represent the mass andvolumefractionsofmaterials,respectively. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the registers of currently valid International Standards. IsO 1773:1997, Laboratory glassware—Narrow-necked boiling flasks. IsO 3170:1988, Petroleum liquids —Manual sampling. IsO 3171:1988, Petroleum liquids — Automatic pipeline sampling IsO 4793:1980, Laboratory sintered (fritted) filters — Porosity grading, classification and designation. ISO5272:1979,Tolueneforindustrialuse—Specifications. 3 Principle A test portion, in a refractory thimble, is extracted with hot toluene until the residue reaches constant mass.