No. 1 in a series: New developments in chromatography
If you call us right now, you can have 5,000 plates per meter, 4 0 plates per second in your LC column by the end of the week.
Sample Size: Column: Packing: Carrier: Flow Rate: Pressure:
Sample Size: Column: Packing: Liq. Phase: Carrier: Flow Rate: Pressure:
2μ\ 50 cm χ 2.3 mm I.D. 37-50μ Corasil-I n-hexane 3.0 ml/min 600 psig
Corasil™ — A NEW porous layer bead for liquid chromatography. Use it as an adsorbent in liquid-solid, or as the sup port in liquid-partition chromatography. The unique combination of solid core and surface porosity gives the highest coefficient of mass transfer of all packing materials presently available. For fast, efficient separations, use Corasil-I. For greater loadability, use Corasil-ll, with double-thick ness layer. The double layer gives added capacity needed in tougher separations.
5μ\ 50 cm χ 2.3 mm I.D. 37-50μ Corasil-ll 0.6% /?,/3'-ODPN n-hexane 3.0 ml/min 1000 psig
Off-the-shelf delivery of either material. Mesh size: 37-50 microns. Price: Corasil-I, $60/25cc; Corasil-ll, $80/25cc. Call or write Waters Associates, 61 Foun tain Street, Framingham, Mass. 01701. Telephone (617) 879-2000. In Europe: Waters Associates, Ltd., Meadow Mills, Waters Street, Portwood, Stockport, Cheshire, England; or Waters Messtechnik GmbH, 6 Frankfurt/Main, Savignystrasse 51, Germany. 4 590
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No. 3 in a series: New developments in chromatography
No. 2 in a series: New developments in chromatography
Gas chromatographers:
Waters announces the fourth new DURAPAK™ GC column packing
Look what DURAPAK™ can do for your Ci to C5 hydrocarbon analyses T h e s t a n d a r d A.S.T.M. m e t h o d f o r separating commercial butanebutylene mixtures specifies a 10meter column, and requires a 50-minute G C analysis. Now look at this c h r o m a t o g r a m , o b t a i n e d in 10 minutes. Note that the C 4 isomer separation is c o m pleted in 3.5 minutes. The separation w a s p e r f o r m e d on a 1.5-meter c o l u m n of Waters'
—developed especially for temperature programming
Column: 1 meter χ Va " OD 80/100 mesh Temp: 40°C to 320°C at 20°C/min Carrier flow rate: 25 ml/min N 2 Flame Ionization Detector Sensitivity: 10~9 amp
Column: 1 meter χ Va " OD Temp: 40°C to 200°C at 20°C/min Carrier flow rate: 25 ml/min N 2 Flame Ionization Detector: 10~9 amp Packing: Durapak-Carbowax 400/Porasil S (80-100 mesh)
D u r a p a k — W a t e r s ' n e w l i n e of jackings featuring chemical bond Df liquid phase to s u b s t r a t e — h a s n a d e history in both gas a n d iquid c h r o m a t o g r a p h y . Now a n e w m e m b e r of t h e line —Carbowax 400 c h e m i c a l l y oonded t o Porasil® S * — a l l o w s jingle-column temperature pro gramming to 200°C. Figure 1 shows that (1) C a r b o wax 400, conventionally c o a t e d on D orasil C, begins t o bleed at 9 0 ° C ; 2) n e w W a t e r s Durapak C a r b o w a x WO b o n d e d to Porasil S is stable ο 200°C under t h e same c o n d i ions; a n d (3) w i t h d u a l - c o l u m n operation, t h e same C a r b o w a x 100/Porasil S provides baseline stability to 300°C. In a d d i t i o n t o i m p r o v e d t h e r m a l stability, t h e new Durapak C a r b o wax 4 0 0 / P o r a s i l S provides t h e
s a m e f e a t u r e s as t h e o r i g i n a l Durapak materials, namely: Speeds to 50 plates/second Higher efficiencies (to 1000 plates/foot) Excellent reproducibility Exceptional loadability High relative retention values For immediate off-the-shelf d e livery in mesh 80-100 ($45 per 75cc bottle), w r i t e Waters A s s o c i a t e s , I n c . , 61 F o u n t a i n S t r e e t , F r a m i n g h a m , Mass. 01701. O r call (617)879-2000. In Europe: Waters Associates, Ltd., Meadow Mills, Waters Street, Portwood, Stockport, Cheshire, England; or Waters Messtechnik GmbH, 6 Frankfurt/Main, Savignystrasse 51, Germany. 4567
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Column: 1.5 m x 0.23 cm Durapak N-Octane/Porasil C 120/150 mesh Temperature: 25°C Carrier: N 2 at 25 ml/min Detector: Flame Ionization new Durapak N-Octane/Porasil C. This revolutionary new packing employs a unique concept in which an octyl group is chemi cally bonded to a porous silica bead—producing a lasting, effi cient, bleed-free packing for col umn temperatures to 175°C. The following Durapak mate rials are now available off-theshelf for immediate delivery at $45 per 75cc bottle: OPN/Porasil C Carbowax 400/Porasil C Carbowax 400/Porasil S N-Octane/Porasil C Write Waters Associates Incor p o r a t e d , 61 Fountain Street, Framingham, Mass. 01701. Or call (617)879-2000. 4567
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