ISO INTERNATIONAL STANDARD 9184-3 First edition 1990-12-15 Paper, board and pulps -- Fibre furnish analysis - Part 3: Herzberg staining test Papier, carton et pates-Determination de la composition fibreuse Partie 3: Coloration de Herzberg Referencenumber ISO 9184-3:1990(E) ISO9184-3:1990(E) Foreword Iso (the International Organizationfor Standardization)is a woridwide federation of national standards bodies (Iso member bodies).The work of preparing International Standards is normally carried out through Iso technical committees. Eachmemberbodyinterested in a subjectfor which a technical committee has been established has the right to be represented on that committee.International organizations, govern- mental and non-governmental, in liaison with iso, aiso 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 Inter- national Standard requires approval byat least75%of the member bodies casting a vote. International StandardIso9184-3waspreparedbyTechnical Committee iso/Tc6,Paper,boardandpulps. Iso 9184 consistsof the following parts,under the general title Paper, board and pulps -- Fibre furnish analysis: Part1:Generalmethod --Part 2: Staining guide - Part 3: Herzberg staining test --Part4:Graff"C"stainingtest -Part 5:Lofton-Merritt stainingtest (modification ofWisbar) -Part6:Weightfactorsbyfibrecoarsenessmethod -Part7:Weightfactorsbycomparisonmethod Part 1 gives general instructions for the performance of fibre furnish analysis. It should be used in conjunction with the staining guide (see part 2) and the staining tests (see parts 3 to 5). Additional parts of this International Standard will be published if re- quired by the development of newkinds offibres or new staining tests. AnnexAofthispartof Iso9184isforinformationonly ISO1990 or by any means,electronic or mechanical, including photocopying and microfilm, without permisslon in writing from the pubiisher. InternationaiOrganizationforStandardization Case Postale 56.CH-1211 Geneve 20·Switzerland Printed in Switzerland ISO 9184-3:1990(E) INTERNATIONALSTANDARD Paper, board and pulps Fibre furnish analysis Part 3: Herzberg staining test Scope 4 Reagents 1 This part of iso9184 specifies the preparation,use CAUTION-Some of the components used in pre- and colour reactions of Herzberg stain in fibre fur- paring this stain are toxic. The stain should be pre- nish analysis. It should be used in conjunction with pared and handled in keeping with safe laboratory Iso9184-1 and,if necessary,with other staining practice. tests defined in ISO 9184-2. Use only reagents of recognized analytical grade The Herzberg staining test is applicable to the and distilled water or water of equivalent purity. qualitative and quantitative differentiation between chemical, mechanical and rag pulps.The stain also 4.1 Zinc chloride solution, saturated at room tem- permits qualitative identification of semi- perature. chemical pulp as well as the differentiation between Add zinc chloride (ZnCl2) to about 100 ml of warm regenerated cellulose fibres (viscose, etc.)and syn- water until an undissolved residue remains. theticfibres. Allow to cool to room temperature and check that some zinc chloride crystallizes.Store in a brown reagent bottle.Thesolutionisstable. Normativereference 2 4.2 lodine solution. The following standard contains provisions which, Mix 2,1 g of potassium iodide (Kl) and 0,1 g of iodine through reference in this text, constitute provisions (12). Add 5 ml of water dropwise to the mixture by of thispartof isO9184.At thetime of publication, mean of a pipette, with constant stirring. Dissolution the edition indicated was valid. All standards are of the iodine into a minimum quantity of water is subjectto revision,andpartiesto agreementsbased important, because pota