1993/11 An International Newsletter ISSN 0958-2118 Number 43 Membrane Technology Improved membrane for airborne particle analysis Gelman Sciences improved GN-4 Metrlcel membrane features a new, acetone-resistant grldllne pattern. The gridline remains visible, even after standard clearing procedures, which assures accurate analysis of visual particulate matter and asbestos levels. The new gridline provides ease of particle counting when using phase contrast microscopy for NIOSH method 7400. GN-4 Metricel membrane, composed of mixed cellulose esters (MCE) is useful for a range of air sampling applications. The membrane possesses low artifacts and clears completely for minimal interference in fibre counting. It is available in 0.8 ~n pore size with diameters ranging from 25-47 mm. The membrane is available plain (non-gridded) for use with transmission electron microscopy (TEM) analysis when performing NIOSH method 7402. The 25 and 37 mm discs are also available preloaded in Air Monitoring Cassettes. Further Informatlon from: Gelman Sciences, 600 South Wagner Road, Ann Arbor, M148103-9019, USA. Tel: +1 313 665 0651. ELSEVIER ADVANCED TECHNOLOGY Nanofiltration system keeps beverage plant on-line A single-pass nanofiltration system provided by Osmonics enabled a large US soft drink bottler to maintain quality beverage production and meet increased demand when problems arose with @1994 Elsevier Science Ltd., l~nglmad./94/$7.00 per item No part of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic, mechanical, photocopying, rccordingor otherwise, without the prior permission of the publishers. (Readers in the U.S.A. -- please see special regulations listed on bac~ cover.)

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Page 1: Improved membrane for airborne particle analysis

1 9 9 3 / 1 1 An International Newsletter ISSN 0958-2118

N u m b e r 4 3

Membrane Technology

Improved membrane for airborne particle analysis G e l m a n S c i e n c e s i m p r o v e d GN-4 Metr lce l m e m b r a n e f e a t u r e s a new, a c e t o n e - r e s i s t a n t g r ld l lne p a t t e r n . The gr id l ine r e m a i n s v is ib le , even af te r s t a n d a r d c l e a r i n g p r o c e d u r e s , w h i c h a s s u r e s a c c u r a t e a n a l y s i s of v i sua l p a r t i c u l a t e m a t t e r a n d a s b e s t o s levels. The n e w gr id l ine p r o v i d e s e a s e of pa r t i c l e c o u n t i n g w h e n u s i n g p h a s e c o n t r a s t m i c r o s c o p y for NIOSH m e t h o d 7400.

GN-4 Metr ice l m e m b r a n e , c o m p o s e d of m i x e d ce l lu lose e s t e r s (MCE) is u s e f u l for a r a n g e of a i r s a m p l i n g a pp l i c a t i ons . The m e m b r a n e p o s s e s s e s low a r t i f a c t s a n d c l ea r s c o m p l e t e l y for m i n i m a l i n t e r f e r e n c e in f ibre coun t ing . I t is ava i l ab l e in 0 .8 ~ n pore size wi th d i a m e t e r s r a n g i n g f rom 2 5 - 4 7 mm. The m e m b r a n e is ava i l ab l e p l a i n (non-g r idded) for u s e wi th t r a n s m i s s i o n e l ec t ron m i c r o s c o p y (TEM) a n a l y s i s w h e n p e r f o r m i n g NIOSH m e t h o d 7402. The 25 a n d 37 m m d i sc s a r e a l so ava i l ab l e p r e l o a d e d in Air Mon i to r ing C a s s e t t e s .

Further Informatlon from: Gelman Sciences, 600 South Wagner Road, Ann Arbor, M148103-9019, USA. Tel: +1 313 665 0651.

E L S E V I E R ADVANCED TECHNOLOGY

Nanofiltration sys t em keeps beverage plant on-l ine A s i n g l e - p a s s n a n o f i l t r a t i o n s y s t e m p r o v i d e d b y O s m o n i c s e n a b l e d a l a rge US soft d r i n k bo t t l e r to m a i n t a i n qua l i t y b e v e r a g e p r o d u c t i o n a n d m e e t i n c r e a s e d d e m a n d w h e n p r o b l e m s a r o s e wi th

@1994 Elsevier Sc ience Ltd., l~nglmad. /94/$7.00 per i tem No part of this publication may be reproduced, stored in a retrieval system, or transmitted by any form or by any means, electronic, mechanical, photocopying, rccordingor otherwise, without the prior permission of the publishers. (Readers in the U.S.A. - - please see special regulations listed on bac~ cover.)