MATHESON SUPPLIES SPAN GASES FOR MOST TOXIC VAPORS... AND THE EQUIPMENT TO MAKE IT WORK T o t e s t or m o n i t o r f o r t o x i c g a s e s a n d v a p o r s is a v i t a l a n d d i f f i c u l t job, whatever the instrument that you use. The accuracy of your measure m e n t s is c r i t i c a l . . . h e a l t h a n d life i t s e l f a r e o f t e n in t h e b a l a n c e . T o ensure this vital accuracy you need a suitable zero gas and an accurate span gas to calibrate your instrument. M a t h e s o n supplies both zero gases and the widest variety of span gases. W e offer both Primary and Certified Standards, or will c u s t o m b l e n d t o y o u r requirements. But, an a c c u r a t e m i x t u r e a n d high quality zero gas are not enough. Without the proper transfer system to carry the gas f r o m the cylinder t o your instrument you jeopardize the value of your work. A g o o d r e g u l a t o r like M a t h e s o n ' s 3 1 0 4 or 3 8 0 0 — c o n s t a n t p r e s sure, metal diaphragm — c o m bined w i t h the proper clean metal t u b i n g is a m u s t . More important, Matheson sup plies e x p e r i e n c e t h a t you c a n d r a w u p o n t o ke;ep y o u r i n s t r u m e n t w o r k i n g a t p e a k e f f i c i e n c y , or t o help y o u select t h e proper equip ment for a new instrument. To improve your operation send for "Gas Mixtures, F a c t s and F a b l e s . " W e d i s c u s s all t h i s in detail and more.
MATHESON L y n d h u r s t , NJ 0 7 0 7 1
Plants and FJSI R u t h e r f o r d . M 0707 ΐ M o r r o w , Georgia .iU2(>0 Gloucester, Massachusetts 01410 lohet Illinois b04U) La Porte, Texas 7 7 Γ ^ 1
CIRCLE 269. O N
Offices { u t a m o n g a , California 9 1 7 Î 0 Newark, California l i4 r >60 W h i t b y , O n t a r i o , Canada U N 5R4 E d m o n t o n , Alberta, (. anada T5B 4K6 Β 24 i l ( l e v e l , Belgium
RFADFR SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 47, NO. 12, OCTOBER 1975 ·
1045A
