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Ash-
f o r Highest Accuracy left: Platinum crucible, with 2 0 g r . S&S Ash Free Filter Paper
petroleum products and liquefied petro leum gases by the lamp method has been introduced by Apex Scientific Co. The apparatus, consisting of 11 units, is suit able for use with both volatile and non volatile liquids. Nonvolatile liquids are blended with a sulfur-free volatile solvent before burning in the lamp.
1502 reasons for choosing
b e l o w : Crucible after mpleted incineration
PRECISION Scientific Equipment
Ask for S&S " A s h - F r e e " A n a l y t i c a l Filter Papers For many years S&S Ash-Free Analyt ical Filter Papers have been known for their extremely low ash content. They have been the choice of chem ists who must have the most precise working tools. To our knowledge, there is no filter paper with lower ash content on the market. In fact, ash content of S&S Quantitative Papers is considerably lower than all other papers we have tested-less than 0.007%. Ask your laboratory supply house for S&S Analytical F i l t e r Papers—the finest, most precise filter paper you can specify. Yet S&S quality costs no more. If you would like to receive a free S&S Filter Paper Sampler, made u p of many grades, just mail t h e coupon below.
In operation, the gas or volatile liquid is burned in a glass lamp and the exit gases are absorbed in a hydrogen peroxide solution. The peroxide con verts the sulfur dioxide from the lamp to sulfuric acid, which is titrated against a standard base. The apparatus is con structed to allow the use of a mixture of carbon dioxide and oxygen for combus tion. This CO2-O2 mixture is superior to air, since it prevents the formation of the nitrogen oxides which aie formed with air. These nitrogen oxides prevent a direct titration if air is used. Individual rotameters meter the oxi dizing gas separately to each lamp, so that each lamp absorber receives exactly the same amount of air or C0 2 -0 2 as any other absorber. Also, each absorber re ceives exactly the specified ASTM rate of 3 liters per min. of the oxidizing gas. This results in more accurate and more reproducible analyses. An impinging jet mixer thoroughly mixes the C0 2 -0 2 mixture before it is distributed to the lamps. Spherical glass and stainless steel joints connecting each of the two traps on the apparatus prevent corrosion and allow ready removal of the traps.
Scintillation
MAIL THIS COUPON FOR FREE SAMPLER Carl Schleicher & Schuell Co. Dept. A C - I S Keene,New Hampshire
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Gentlemen: Please send me, free, a n S&S Analytical Filter Paper Sampler.
Name Company. Address City
-State-
I I I I I I
Circle No. 46 A-1 on Readers' Service Card, page 39 A
46 A
Counter
National Radiac has announced an addition to its line of complete scintilla tion counters. The new model, a 1-in. maximum diameter scintillation counter, is a waterproof, hermetically sealed high-temperature unit consisting of interchangeable crystal detectors for the detection and measurement of alpha, beta, and gamma rays, neutrons, and x-rays. The over-all unit consists of a crystal detector, a 'A-in. photomultiplier For further information, see coupon on page 39 A
n e S S O n \ —Precision labora tory equipment has earned a justly deserved reputation over the years for quality in research laboratories all over the country. r \ G 3 S O n ^ — P r e c i s i o n has an ever increasingly wide range of stock on hand for immediate de livery to you.
1 5 0 0 More Reasons —Precision is the only manufac turer of a complete line of research laboratory equipment. Some 1500 items are quality-made by Preci sion for accuracy and dependability in the laboratory. Precision equip ment includes: Kjeldahl
Equipment
Standard models and c u s t o m s e t - u p s for every distillation and digestion need. Kjeldahl Extraction Rack illustrated.
Laboratory
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Utilities
A c οmρ Ie t e l i n e o f " t o o l s " and accessories for the laboratory. SeroUtility B a t h , at right, c a n be used as either a s e r o logical or utility b a t h .
Water
Stills
For p r o c e s s i n g o r lab oratory use. Recom mended for use even with the hardest raw water. Electric, gas or steam heated. Automatically controlled.
F l a s h Point Testers Cleveland type shown. Meets a p p l i c a b l e A.S.T.M. and A . A . F . specifications. For complete catalogs o n a n y o f the a b o v e equipment, w r i t e :
Precision Scientific Company 3 7 2 5 West Cortland Street, Chicago 4 7 Circle Nos. 4G A-2, 46 A-3, 46 A-4, 46 A-5 on Readers' Service Card, page 39 A
ANALYTICAL
CHEMISTRY
