(19)

(11)

EP 1 373 146 A2

(12)

(88) Date of publication A3: 16.10.2003 (43) Date of publication: 02.01.2004 Bulletin 2004/01 (21) Application number: 02720137.5 (22) Date of filing: 28.03.2002

(51) International Patent Classification (IPC)7: C02F 3/06, C02F 3/12, C02F 3/10 (86) International application number: PCT/GB2002/001503 (87) International publication number: WO 2002/079103 (10.10.2002 Gazette 2002/41)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 28.03.2001 GB 0107801 (71) Applicant: Natural Environment Research Council Swindon,Wiltshire SN2 1EU (GB)	(72) Inventors: DARTON, Richard CharlesDept. of Eng. Science OxfordOxfordshire OX1 3PJ (GB) JOHNSON, Andrew CliftonCtr.for Ecology & Hydrol. Wallingford,Oxfordshire OX10 8BB (GB) (74) Representative: Paget, Hugh Charles Edward et al MEWBURN ELLISYork House23 Kingsway London WC2B 6HP London WC2B 6HP (GB)