(19)

(11)

EP 0 729 578 A1

(12)

(43) Date of publication: 04.09.1996 Bulletin 1996/36 (21) Application number: 95900866.0 (22) Date of filing: 17.11.1994

(51) International Patent Classification (IPC):  G01N 27/ 04( . ) G01N 33/ 10( . ) G01N 27/ 22( . ) (86) International application number: PCT/GB1994/002525 (87) International publication number: WO 1995/014228 (26.05.1995 Gazette 1995/22)

(84) Designated Contracting States: AT DE DK ES FR GB IE IT NL SE (30) Priority: 17.11.1993 GB 19930023693 (71) Applicant: PERSTORP ANALYTICAL LIMITED Maidenhead, Berkshire SL6 3UD (GB)	(72) Inventors: ROBERTS, Tudor Bryn Twr Abergele Clwyd (GB) COLLIER, Mark Surrey (GB) (74) Representative: Frankland, Nigel Howard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 80801 München 80801 München (DE)