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INTERNATIONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION@ME)YHAPO~HAR OPl-AHM3AL&lR I-IO CTAH~APTM3A~MM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Aluminium and aluminium alloys - Determination of
titanium - Spectrophotometric chromotropic acid method
Aluminium et alliages d ‘aluminium - Dosage du titane - M&hode spectrophotometrique 2 / ‘acide chromo tropique
First edition - 1978-12-15
UDC 669.71 : 543.42 : 546.821 Ref. No. ISO 1118-1978 (E)
Descripteurs : aluminium, aluminium alloys, Chemical analysis, determination of content, titanium, spectrophotometric analysis.
Price based on 6 pages This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-601081
FOREWORD
ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO member bodies). The work of developing
International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council.
International Standard ISO 1118 was developed by Technical Committee ISO/TC 79, Light metals and their a/loys.
lt was submitted directly to the ISO Council, in accordance with clause 6.13.1 of the Directives for the technical work of ISO. lt cancels and replaces ISO Recommendation R 1118-1969, which had been approved by the member bodies of the following countries :
Belgium Canada Colombia Czechoslovakia Egypt, Arab Rep. of France
Germany, F.R.
Hungary India
Iran Israel Italy Japan
Korea, Rep. of Netherlands New Zealand Norway Poland
South Africa, Rep. of Spain
Sweden Switzerland Thailand Turkey
United Kingdom U.S.A.
U.S.S. R.
No member body had expressed disapproval of the document.
0 International Organkation for Standardkation, 1978 l
Printed in Switzerland
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IN T E R N A T IO N A L S T A N D A R D IS O
1 1 1 8 -1 9 7 8 (E )A l u m i n i u m a n d a l u m i n i u m a l l o y s - D e te rm i n a ti o n o f
ti ta n i u m - S p e c tro p h o to m e tri c c h ro m o tro p i c a c i d m e th o d
1 S C O P E A N D F IE L D O F A P P L IC A T IO N
T h i s In te rn a ti o n a l S ta n d a rd s p e c i fi e s a g e n e ra l m e th o d fo r th e s p e c tro p h o to m e tri c d e te rm i n a ti o n o f ti ta n i u m i n a l u m i n i u m a n d a l u m i n i u m a l l o y s .
T h e m e th o d i s a p p l i c a b l e to p ro d u c ts h a v i n g ti ta n i u m c o n te n ts b e tw e e n 0 ,0 0 5 a n d 0 ,3 % (m l m ).
H o w e v e r, th e m e th o d i s n o t a p p l i c a b l e c o m p l e te l y to a l l o y s h a v i n g S i l i c o n c o n te n ts g re a te r th a n 1 % (m l m ), fo r w h i c h i t m u s t b e m o d i fi e d a s i n d i c a te d i n th e a n n e x .
2 P R IN C IP L E
A tta c k o f a te s t P o rti o n w i th s o d i u m h y d ro x i d e , a n d a c i d i fi c a ti o n o f th e a l k a l i n e S o l u ti o n w i th n i tri c a c i d a n d s u l p h u r i c a c i d .
R e d u c ti o n o f th e i r o n ( I II) w i th a s c o rb i c a c i d , a n d fo rm a ti o n o f th e ti ta n i u m -c h ro m o tro p i c a c i d c o m p l e x a t a C h o s e n p H v a l u e b e tw e e n 2 a n d 2 ,5 0 , c o n tro l l e d to w i th i n L - 0 ,0 5 p H u n i t.
S p e c tro p h o to m e tri c m e a s u re m e n t o f th e c o l o u re d c o m p l e x a t a w a v e l e n g h o f a b o u t 4 7 0 n m .
3 R E A G E N T S
D u r i n g th e a n a l y s i s , u s e o n l y re a g e n ts o f re c o g n i z e d a n a l y ti c a l g ra d e a n d d i s ti l l e d w a te r o r w a te r o f e q u i v a l e n t p u r i t y .
3 .1 S o d i u m h y d ro x i d e , 2 0 0 g /l o r a p p ro x i m a te l y 5 N S o l u ti o n .
In a n i c k e 1 d i s h , d i s s o l v e 2 0 0 g o f s o d i u m h y d ro x i d e i n w a te r. A fte r c o o l i n g , m a k e u p th e v o l u m e to 1 0 0 0 m l a n d m i x . Im m e d i a te l y tra n s fe r th e s o l u ti o n to a p l a s ti c C o n ta i n e r.
3 .2 S o d i u m h y d ro x i d e , 8 0 g /l o r a p p ro x i m a te l y 2 N S o l u ti o n .
In a n i c k e 1 d i s h , d i s s o l v e 8 0 g o f s o d i u m h y d ro x i d e i n w a te r. A fte r c o o l i n g , m a k e u p th e v o l u m e to 1 0 0 0 m l a n d m i x .
3 .3 N i tri t a c i d , p 1 ,4 0 g /m l , a p p ro x i m a te l y 1 5 N S o l u ti o n .
3 .4 S u l p h u r i c a c i d , p l ,4 8 g /m l , a p p ro x i m a te l y 1 8 N S o l u ti o n .
C a re fu l l y a d d 5 0 0 m l o f s u l p h u r i c a c i d , p 1 ,8 4 g /m l , a p p ro x i m a te l y 3 6 N S o l u ti o n , to a p p ro x i m a te l y 4 0 0 m l o f w a te r. A fte r c o o l i n g , m a k e u p th e v o l u m e to 1 0 0 0 m l a n d m i x .
3 .5 S u l p h u r i c a c i d , p 1 ,2 1 g /m l , a p p ro x i m a te l y 7 N S o l u ti o n .
C a re fu l l y a d d 2 0 0 m l o f s u l p h u r i c a c i d , p 1 ,8 4 g /m I, a p p ro x i m a te l y 3 6 N S o l u ti o n , to a p p ro x i m a te l y 7 0 0 m l o f w a te r. A fte r c o o l i n g , m a k e u p th e v o l u m e to 1 0 0 0 m l a n d m i x .
3 .6 S u l p h u r i c a c i d , p 1 ,0 6 g /m l , a p p ro x i m a te l y 2 N s o l u ti o n .
C a re fu l l y a d d 6 0 m l o f s u l p h u r i c a c i d , p 1 ,8 4 g /m l , a p p ro x i - m a te l y 3 6 N S o l u ti o n , to a p p ro x i m a te l y 5 0 0 m l s f w a te r.
A fte r c o o l i n g , m a k e u p th e v o l u m e to 1 0 0 0 m l a n d m i x .
3 .7 S u l p h u ro u s a c i d (H ,S O ,), S o l u ti o n s a tu ra te d a t ro o m te m p e ra tu re .
3 .8 S o d i u m s u l p h i te , 2 0 g /l S o l u ti o n .
D i s s o l v e 2 g o f s o d i u m s u l p h i te (N a ,S O ,) i n w a te r a n d m a k e u p th e v o l u m e to 1 0 0 m l .
P r e p a re im m e d i a te l y b e fo re u s e .
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