If you're not happy with your pollution sampling or monitoring filter

If you're not happy with your pollution sampling or monitoring filter media maybe you should shop elsewhere. Here, for instance. Whatman offers filter media for air and water pollution sampling and monitoring that are the most widely used in the world. For very good reasons. There's an even level of dependable high quality completely across the wide range of these media. Whatman quality. And this quality is a part of every pollution filter medium: pure, borosilicate Glass Microfibre circles, sheets, rolls —

binder free; the matchless EPM 1000 Glass Microfibre sheets for high volume air sampling; famous Whatman filter papers such as No. 41 and No. 1, probably the most widely used filter paper in the world; extraction thimbles . . . Nearly everything you need in filter media for sampling and monitoring, except the pollutants. From Whatman. Whatman products for pollution sampling and monitoring are available from your lab supply dealer. Or write: Whatman Inc. 9 Bridewell Place, Clifton, N.J. 07014; tel: 201-777-4825.

Whatman CIRCLE 227 ON READER SERVICE CARD 2 9 4 A · ANALYTICAL CHEMISTRY, VOL. 52, NO. 2, FEBRUARY

1980