send this coupon for information on these new developments fromM C / B Division of The Matheson Company Inc.
Norwood,Ohio; East Rutherford, N.J.; Los Angeles.
Matheson Coleman & Bell P.O. Box 85, East Rutherford, N.J. 07073 Please send information on items checked: •
Pest/c/dequa/ity So/vents
Π
Grignard Reagents
•
Send Free Spectroquality Book
Π Deuteroquality Solvents •
Na & Κ
Name_ Firm Address___ City
PESTICIDEQUALITY One of the most accurate methods for de termining pesticide residues involves the extraction of the pesticides from produce with organic solvents. In order to get valid results the solvent must be free of impuri ties that will mask the detection of the pesticide which is analyzed by gas chroma tography using an electron capture detector. Pesticidequality solvents are specially purified to remove all such impurities and are certified to contain no interfering sub stance greater than that equivalent to 10 parts per trillion of a chlorinated pesticide. Send coupon for prices and information.
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FREE
52 PAGE BOOK Contains Spectra, Physical Properties, Specifications and Typical Uses of 46 MC&B Spectroquality Solvents. A timesaving book containing detailed informa tion to aid the Spectroscopist and researcher in selecting the best solvent for each application. Check coupon.
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State
RMgX
>·
Zip
Molor Concentration
[thylmagnesium Bromide...2.0 'henylmagnesium Bromide .2.0 iyclohexylmagnesium Chloride
2.0
:ert-Butylmagnesium Chloride
2.0
VIethylmagnesium Chloride .2.0 so-Propylmagnesium Chloride
2.0
Now, for the first time, we can supply high quality Grignard Rea gents, ready f o r use; quality preserved in screw-capped t i n n e d containers. Exact lot molarity on the label. Others can be sup plied on a custom ba sis. Check coupon for brochure including prices and bibliography. Q
DEUTEROQUALITY SOLVENTS M C & B d i s t r i b u t o r s n o w offer a quality line of C a l i b r a t i o n Reference Standards for Nuclear M a g n e t i c Resonance Spectroscopy. Check coupon f o r p r i c e list.
NEW! For safe, convenient lab u s e . . . Sodium Wire and Spheres. Extruded wire and spheres packaged under kerosene and mineral oil. V , Vu", 34". Sodium and Potassium dispersions. Much safer to han dle than bulk chemicals. In 1 micron, 5 microns, 15-20 microns and crushed solid. Active Sodium Chemicals. The following MC&B active sodium chemicals are now available from stock: Sodium Ethoxide, Pract, Sodium iso-Propoxide, Pract., Sodium Butoxide, Sodium Acetylide. Other active sodium com pounds are available on a custom basis. Write for price list.
# Circle No. 154 on Readers' Service Card
VOL. 39, NO. 4, APRIL 1967 ·
17 A
