REPORT FOR ANALYSTS t h e higher-cost infrared i n s t r u m e n t s . Utilization of t h e low-cost i n s t r u m e n t s is envisioned for teaching or research a t b o t h t h e g r a d u a t e and u n d e r g r a d u a t e levels. T h e new low-priced i n s t r u m e n t s b y no m e a n s o u t m o d e either t h e existing elaborate i n s t r u m e n t s or t h e skilled spectroscopist. T h e y will relieve t h e spectroscopist of m u c h routine work and actually greatly enhance his value t o his organization. Consider t h e problem of educating t h e organic chemist in t h e use of his newi n s t r u m e n t a n d interpretation of t h e results he obtains from it. T h i s t a s k will fall on t h e shoulders of t h e spectros copist where h e is available, or u p o n the i n s t r u m e n t manufacturer. The spectroscopist will be called upon t o set u p routine analyses for t h e chemist, assist h i m in his sampling problems, and show h i m how t o use his spectra. As t h e simple i n s t r u m e n t s get into wide spread use, t h e spectroscopist will be asked t o set u p analyses t h a t he never dreamed of before. T h e new i n s t r u m e n t s will h a v e a n o t h e r effect, t h a t of removing routine infrared analysis from t h e present elaborate i n s t r u m e n t s a n d freeing t h e m for t h e t y p e of work for which t h e y were originally designed: basic studies in s t r u c t u r a l analysis, precise q u a n t i t a tive work, a n d similar problems t h a t p u t their extreme versatility a n d flex ibility t o work. U n d o u b t e d l y t h e spec troscopist will acquire simple instru m e n t s for his own use t o relieve t h e b u r d e n on his present e q u i p m e n t . T h e spectroscopist will also be called upon t o advise t h e chemist on t h e t y p e and m a k e of infrared spectrometer t h a t he should acquire. T h u s it is i m p o r t a n t for t h e spectroscopist t o u n d e r s t a n d both t h e a d v a n t a g e s a n d limitations of the low-priced i n s t r u m e n t s . I n t h e first place, t h e y have been designed t o be a s simple t o use a n d as rugged as possible. M o s t operating p a r a m e t e r s are fixed and h a v e been chosen so t h a t t h e m a x i m u m a m o u n t of useful information can be gained consistent with cost and simplicity. Convenience a n d reliabil ity are of equal or greater i m p o r t a n c e t h a n performance. T h e factors of serv ice policy a n d application assistance on t h e p a r t of t h e m a n u f a c t u r e r will probably be more i m p o r t a n t with t h e cheaper i n s t r u m e n t s t h a n with t h e elaborate ones. Three Major T y p e s Available. W i t h t h e i n t r o d u c t i o n of t h e lowpriced s p e c t r o m e t e r s t h e b u y e r of in frared e q u i p m e n t n o w h a s t h r e e b r o a d categories of infrared s p e c t r o m eters t o choose from. T h e i n s t r u m e n t s a t t h e t o p end of t h e price range (over $10,000) have tre mendous all-around versatility and
performance. T h e y h a v e double or split b e a m p h o t o m e t e r s a n d single or double monochromators. B y a n d large t h e y are capable of tackling practically a n y problem in absorption spectroscopy t h a t m a y arise. M o s t of t h e instru m e n t s in this category are backed b y a very considerable range of accessories a n d special a t t a c h m e n t s which will further extend their usefulness. T h e y are especially good for qualitative, work and a d e q u a t e for m o s t quantitative, applications. I n t h e middle price range ($6000 t o $9000) are a group of instruments, mostly single-beam in design with single, double-pass, or grating mono chromators. Their characteristics m a k e them most suitable for extremely precise q u a n t i t a t i v e measurements, such as might be encountered in t h e control l a b o r a t o r y ; a n d because t h e y are even more flexible t h a n t h e most expensive group of instruments, t h e y are ad mirably suited for a n u m b e r of special applications. These include physical and physical-chemical research such as rapid scan studies, t h e use of infrared microscopes, t h e installation of gratings for super-high-resolution work, studies of sources, detectors, and t h e like. T h e special a t t a c h m e n t s needed for some of these studies often bring t h e prices of these i n s t r u m e n t s u p t o a n d above those of t h e first i n s t r u m e n t group. T h e y usually require a higher degree of operating skill t h a n either t h e most ex pensive or t h e least expensive groups. Finally, t h e low-priced i n s t r u m e n t s (some of which will sell for under $5000) are best suited for qualitative work and for q u a n t i t a t i v e applications, where high versatility is n o t required. T h e y have single or double-beam photometers and single monochromators. Their prime characteristics are long-term re producibility a n d simplicity. Summary. T h e n e w low-priced infrared s p e c t r o p h o t o m e t e r s will, in t h e long r u n , t r e m e n d o u s l y b r o a d e n t h e a p p l i c a t i o n of infrared a n a l y s i s . T h e y will p r o v i d e t h e organic c h e m i s t with a m u c h needed basic tool for his research activity. I n addition, t h e y will greatly broaden t h e scope of a c t i v i t y of t h e present d a y spectroscopist through the increased d e m a n d t h e y will place on h i m for new infrared techniques and t h r o u g h t h e freedom t h e y will give h i m from routine work, p e r m i t t i n g a greater preoccupation in basic infrared research.
For chemists who are never satisfied...
Photograph Courtesy of the Fleischmann laboratories. Standard Brands Incorporated
S&S Analytical Filter Papers make possible new standards of precision New techniques in industry now de mand added precision in the analytical laboratory —especially in quality con trol. S & S Analytical Filter Papers of fer unique and exclusive advantages to the chemist who is never satisfied. FOR QUANTITATIVE GRADES — less
F R E E A n a l y s i s Kit ,^-Γ,-β--"-"^ ίΠτ--ι—A \\" _ \\ li " | \\ " ! i_. ..»-""r;. ;
, Bin*
SGin*
Sampler with large assortment of 11 cm circles in wide selection of grades. Several quantitative papers included in sampler also are available in sheets or s t r i p s f o r chromatography and electro phoresis.
Carl Schleicher & Schuell Co. Keene, New Hampshire, Dept. AC-27 Please send FREE S&S Analysis Kit SAMPLER. ; (Name)
Several technical papers on this sub ject are scheduled for presentation at the Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy (page39A). T h e instruments themselves will be shown at the Exposition of Modern Laboratory Equipment (page 51A).
than
0.007% ash; 97-98% alpha cellulose content, FOR ALL GRADES-Standardiza tion for consistent accuracy. Selection from a wide range of types. Every year many chemists who were once satisfied with other brands stand ardize their procedure on S & S Analyti cal Filter Papers for consistent accuracy lot after lot, large selection of grades, and the confidence that goes with using the finest. And the finest costs no more. Even if you are satisfied with your present filtration products, you owe it to yourself and your work to try S & S Analytical Filter Papers and filtration specialties and compare. Send for the free S&S Analysis Kit sampler described below. It costs you nothing, and there is no obligation.
(Position)
! (Company) • (Address)
; ;
~~
" !
: (City) (State) ; ; • Also send FREE S&S Quick Reference Catalog.; Circle Nos. 21 A-1, 21 A-2 on Readers' Service Card, gage 91 A VOL. 2 9 , N O . 2 , FEBRUARY 1 9 5 7 · 21 A
