T H E 'GENJUS' Q EDTA for choosey
chelation
W e w o n ' t guarantee that Merck's EDTA (ethyleiKv/iaminoietraweetic acid reagent to \ o u knowledgeable folk) will win you a Nobel prize, but we do assure \ou tbat it can make certain difficult purification or separation problems seem simple—positive genius. Analytical chemists note that Merck EDTA Reagent has a n unfailing boarding-house clutch for cations. E D T A broaches no interference in polarographic pro c e d u r e s — by choosey chelation, it snatches cobalt, nickel, lead, zinc, cadmium, aluminum, barium, or s t a n n o u s and manganous ions from solution. And in selective precipitation and separation of a number of r a r e e a r t h s , attend to this example—a 1:1 europiumE D T A complex is not soluble in water, while a 4:3 curopium-EDTA complex is completely soluble 1 —sepa r a t i o n simple. T o the peaked pharmaceutical or organic chemist who can't count on serendipity to provide the answers on purification of pharmaceuticals or reagents, we suggest Merck's EDTA in combination with an ion exchange resin. It beats all for purification, and for separation of many compounds having almost identical chemical properties. A n d since w e ' r e on the topic of purification and separation, we'd like you to know that EDTA will do a clean-up job on m o r e than just solutions. While steam is j u s t fine as a cleaning or purifying procedure for the h u m a n species, it presents quite a problem of corrosion w h e n in contact with metal surfaces. So if the grossly practical plant problem of scale removal from boilers
Precision Tools for Accurate
Analysis
and heal exchange equipment has steamed up vour corner, perhaps we can help clear the air—chelation with EDTA is most often the answer. Or for "hot 1 contamination, coo! chemists choose Merck EDTA Reagent. While somewhat excessively refined, it is an excellent decontaminant for radioactive surface's. T o improve your "genius" rating, remember, EDTA Reagent (Merck, of course) is one of the most useful of all sequestering agents available. Should you want further information on Merck EDTA Reagent, just drop a card to the Distributive Products Department, Merck & Co., Inc.. Rahwav, New Jersey.
MERCK EDTA SPECS ("lean, white, odorless, crystalline powder Assay: 99-10T'c C10H16N2O8 Insoluble in sodium carbonate solution : Max. 0.005% Residue after ignition: Max. 0.20','t Heaw Metals (as Pb) : Max. 0.001'.'I lion (as Fe) : Max. O.OOoTc Available in U lb. and 1 lb. bottles
MERCK & CO., INC. C/wmical R A H W A Y ,
) Merck & Co.. Inc.
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