EN ISO 105-Z10:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tekstilije - Preskušanje barvne obstojnosti - Del Z10: Ugotavljanje relativne intenzivnosti barv v raztopini (ISO 105-Z10:1997)Textilien - Farbechtheitsprüfungen - Teil Z10: Bestimmung der relativen Farbstärke von Farbstoffen in Lösung (ISO 105-Z10:1997)Textiles - Essais de solidité des teintures - Partie Z10: Détermination de l'intensité relative de la couleur des colorants en solution (ISO 105-Z10:1997)Textiles - Tests for colour fastness - Part Z10: Determination of relative colour strength of dyes in solution (ISO 105-Z10:1997)59.080.01Tekstilije na splošnoTextiles in generalICS:Ta slovenski standard je istoveten z:EN ISO 105-Z10:1999SIST EN ISO 105-Z10:1999en01-november-1999SIST EN ISO 105-Z10:1999SLOVENSKI
STANDARD
AReference numberISO 105-Z10:1997(E)INTERNATIONALSTANDARDISO105-Z10First edition1997-12-15Textiles — Tests for colour fastness —Part Z10:Determination of relative colour strength ofdyes in solutionTextiles — Essais de solidité des teintures —Partie Z10: Détermination de l'intensité relative de la couleur des colorantsen solutionSIST EN ISO 105-Z10:1999

ISO 105-Z10:1997(E)©
ISO 1997All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · SwitzerlandInternetcentral@iso.chX.400c=ch; a=400net; p=iso; o=isocs; s=centralPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies castinga vote.International Standard ISO 105-Z10 was prepared by Technical CommitteeISO/TC 38, Textiles, Subcommittee SC 1, Tests for coloured textiles andcolorants.ISO 105 was previously published in thirteen “parts”, each designated by aletter (e.g. “Part A”), with publication dates between 1978 and 1985. Eachpart contained a series of “sections”, each designated by the respectivepart letter and by a two-digit serial number (e.g. “Section A01”). Thesesections are now being republished as separate documents, themselvesdesignated “parts” but retaining their earlier alphanumeric designations. Acomplete list of these parts is given in ISO 105-A01.Annex A of this part of ISO 105 is for information only.SIST EN ISO 105-Z10:1999

© ISOISO 105-Z10:1997(E)iiiINTRODUCTIONThis part of ISO 105 describes a practicable method fordetermination of colour strength based on absorbancemeasurement of dye solutions.
The relative colour strengthis defined primarily by means of comparison of dyeings,which are prepared from the dye under test and thereference dye at the same depth.
The relative colourstrength is therefore the reciprocal ratio of the dyeconcentrations, expressed as a percentage, hence it is avalue defined by means of an application technique and isassociated with the conditions of preparation of the dyeingsand their evaluation.
Despite this general limitation,determination of colour strength in solution is usefulbecause of the decisive advantage of higher accuracy(reproducibility) with little expenditure of effort.
Thevalidity of the result should be controlled by comparisonwith evaluation by means of an application method.SIST EN ISO 105-Z10:1999

INTERNATIONAL STANDARD
© ISOISO 105-Z10:1997(E)1Textiles — Tests for colour fastness —Part Z10:Determination of relative colour strength of dyes in solution1
ScopeThis method is intended for the determination of the colour strength of a dye in relation tothat of a reference dye by means of spectrophotometric absorption measurements onsolutions of dyes.NOTES1
Basic requirements for this method are that the dye solutions do not scatter light andobey the Bougher-Lambert-Beer law as well as identical or similar absorption curves of thesamples and the reference in the visible region of the spectrum.2
Identical or similar absorption curves are usually obtained if the tests are carried out forthe purpose of dye production control of batches/deliveries of the same dye.
This method isnot applicable for the evaluation of dyes with distinctly different adsorption curves.3
The colour strength of a dye is not a physical constant, since it is dependent, forexample, on the test medium and test method.
The colour strength determined by thismethod therefore may differ from those found by other determinations, e.g. instrumental orvisual assessments of dyeings.2
Normative referencesThe following standards contain provisions which, through reference in this text, constituteprovisions of this part of ISO 105.
At the time of publication, the editions indicated werevalid.
All standards are subject to revision and parties to agreements based on this part ofISO 105 are encouraged to investigate the possibility of applying the most recent editions ofthe standards indicated below.
Members of IEC and ISO maintain registers of currentlyvalid International Standards.SIST EN ISO 105-Z10:1999

ISO 105-Z10:1997(E)© ISO2ISO 648:1977, Laboratory glassware — One-mark pipettes.ISO 1042:1983, Laboratory glassware — One-mark volumetric flasks.3
DefinitionsFor the purposes of this part of ISO 105 the following definitions apply :3.1 colour strength:
A measure of the ability of a dye to impart colour to other materialscharacterized by its absorption in the visible region of the spectrum and expressed as acolour strength value.3.2 relative colour strength:
The percentage ratio of the colour strength value of thesample to that of the reference dye, the colour strength of which is 100 %.NOTE —
As the relative colour strength is determined by a comparison with a referencedye, this is assumed to remain constant.
It is essential therefore to ensure careful storageand control of the reference dye. Many dyes are hygroscopic and sensitive to oxidation. It isessential to protect the reference dye from exposure to light in firmly sealed containers thatare impervious to moisture.3.3
colour strength value:
The extinction coefficient at the maximum absorption of thereference dye.NOTE —
Colour strength is traditionally a colouristic concept, being based essentially ona visual assessment.
Therefore colour strength determined instrumentally should notcontradict visual assessment.
Such a contradiction would not be expected if the samples tobe compared exhibit concentration-dependent differences in absorption only i.e. theirabsorption curves in the visible region are identical when the strength of the absorptioncurves is made equal, or show only insignificant differences.If the absorption curves differ more markedly (shade differences), a better correlation withvisual assessment may be obtained if the weighted total extinction in the visible region isused as the colour strength value.4
PrincipleSolutions of the dye under test and the reference dye are prepared and the absorptivity orcolour strength values derived from them are determined.The percentage relative colour strength Fs, is given by the following equation :Fffskk100=´21SIST EN ISO 105-Z10:1999

© ISOISO 105-Z10:1997(E)3wherefk1is the colour strength value of reference dye;fk2is the colour strength value of dye under test.5
Apparatus5.1
Flasks, in accordance with ISO 1042.5.2
Pipettes, in accordance with ISO 648.5.3
Cells.5.4
Cuvettes or flow cells.5.5
Analytical balance.5.6
Spectrophotometer or filter colorimeter.6
SolventsWARNING —
This part of ISO 105 calls for the use of substances and/orprocedures that may be injurious to health if adequate precautions are nottaken.
It refers only to technical suitability and does not absolve the user fromlegal obligations relating to health and safety at any stage.
It has been assumedin the drafting of this part of ISO 105 that the execution of its provisions isentrusted to appropriately qualified and experienced people.NOTE —
When selecting solvents the following aspects are important :solubility of dye;stability of solutions;reproducibility of test;applicability of result to other media or practical applications.The solvent used shall be selected from the following :(a)
for water soluble dyes : water (demineralized)(b)
for water insoluble dyes :methanol, ethanol;acetone;N-methylpyrrolidone;cellosolve, ethylene glycol monoethylether;mixtures of the above solvents.Dilute the concentrated stock solution (see 7.1.3 and 7.1.4) with the same solvents.Dissolve the stock dispersion in organic solvents and then dilute.
The following additivesare recommended to improve the stability and reproducibility.SIST EN ISO 105-Z10:1999

ISO 105-Z10:1997(E)© ISO4(a)
To adjust the pH :acids (e.g. sulphuric acid, acetic acid);bases (e.g. sodium hydroxide, sodium carbonate);buffer systems.(b)
To eliminate the influence of unwanted metal ions :sequestering agents.(c)
Agents with a deagglomerating or disaggregating action in water:surfactants, generally ethylene oxide adducts to alkanols.(d)
Other additives:dispersing agents;antioxidants.7
Procedure7.1
Preparation of solutions for measurement7.1.1
SamplesStore the samples in firmly sealed containers in order to avoid erroneous results arisingfrom the release or uptake of moisture.7.1.2
WeighingWeigh an amount of not less than 0,5 g, to avoid errors attributable to micro-inho
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