EDITORS' COLUMN
2
EDITORS' COLUMN Τη THE ARTICLE "Analytical Chem- istry in Yugoslavia," [ANAL. CHEM., 41 (8), 24 A (1969) ], it was stated that the University of Bel- grade is the oldest university (about 100 years) in the country. Several letters from Yugoslavia have pointed out that while the Univer- sity of Belgrade celebrated its cen- tennial a few weeks ago, the tercen- tennial celebration of the Univer- sity of Zagreb is being held in 1969. The University of Zagreb has existed by that name only since 1874, but its origins can be traced to 1662 when Jesuits founded a col- legiate institute of philosophy in that city. The tercentennial cele- bration marks the elevation of that institute by Kaiser Leopold I of Austria-Hungary in 1669 to the rank of a faculty of philosophy. The modern definition of a uni- versity requires the existence of four faculties, and confusion often arises as to whether the founding date refers to the origin of the ante- cedent institution or of the full- fledged university. As for the early history of chem- istry in Croatia, S. Miholic, in Bul- letin Scientifique, 3 (2), 33, states, "One can almost say that the al- chemistic period in chemistry lasted in Croatia till the middle of the 19th century. The only other ex- perimental work in chemistry was the number of analyses of Croatia mineral waters made by apothecar- ies, of which some are remarkably well done. The opening of the first technological middle school in Za- greb in 1854 marked the beginning of a new era. In 1856 the first course of experimental chemistry was delivered at that school by Canon J. Torbar (1824-1900·) phys- icist and later president of the Yugoslav Academy of Sciences. From 1859 the course in.chemistry was given by P. Zulic, who wrote the first textbook of chemistry (1866). A further step was made when the University of Zagreb was Micro DTA & DSC in 1 instrument? Detection of an Extremely Small Peak (C). Probe: GS(25 /Λ) Sample: Tri-caleinm silicate— 37 mg. Sensitivity: 20 μν full scale Reversible crystalline transitions in the 900 to 1,000°C range. Tiny peak (C) distant only 10° C from peak (B) is perfectly detected. ΔΤ signal for peak (C) does not exceed 0.02°C. PrécisetnentS The fourth generation micro thermal analyzer developed by Professor Mazieres of the University of Paris is now available in the U.S. through the Infotronics sales and service organization. The M.-4 D T A measures temperature differentials in the —160°Cto + 1600°C range with 0.1°C resolution. Temperature is programmed by a front panel switch at rates of 1°C to 20°C/min. Full atmospheric control is maintained with inert gas in the sample cavity. But that's only part of the story. The M-4 also fund ions τ effectively as a differential scanning calorimeter—wit] H»I 11 the use of special cells. Quantitative measurement?· >.. η be obtained with excellent accuracy and with little calibration. Key to the M-4's sensitive performance for DTA and DSC lies in its patented probe design which features three hollow thermo- couples. Extremely high efficiency of detector operation is the result of close contact with small sample sizes— 0.6 μΐ tO 25 μ\. Applications include all phases of organic and inorganic chemistry, such as polymers, elastomers, crystallography, ceramics, metallurgy, and quality control of feeds, foods and pharmaceuticals. To learn more, write for Data File DTA-4. INFOTRONICS CORP. 1062 Linda Vista Avenue Mountain View, California 94040 Phone(415)968-9710 Circle No. 103 on Readers' Service Card ANALYTICAL CHEMISTRY, VOL. 4 1 , NO, 14, DECEMBER 1969 · 69 A
Transcript of EDITORS' COLUMN
E D I T O R S ' C O L U M N
Τ η T H E ARTICLE "Analyt ica l Chemistry in Yugoslavia ," [ A N A L .
C H E M . , 41 (8) , 24 A (1969) ] , it was s ta ted t h a t the Universi ty of Belgrade is the oldest univers i ty (about 100 years) in the country . Several letters from Yugoslavia have pointed out t h a t while t he Univers i ty of Belgrade celebrated its centennia l a few weeks ago, the tercentennia l celebration of the Univers i ty of Zagreb is being held in 1969.
T h e Univers i ty of Zagreb has existed by t h a t name only since 1874, but its origins can be t raced to 1662 when Jesui ts founded a collegiate inst i tute of philosophy in t h a t city. The tercentennial celebra t ion marks the elevation of t h a t ins t i tu te by Kaiser Leopold I of Aus t r i a -Hunga ry in 1669 to the r a n k of a faculty of philosophy.
The modern definition of a uni versi ty requires t h e existence of four faculties, and confusion often arises as to whether the founding d a t e refers t o the origin of the an te cedent inst i tut ion or of the full-fledged univers i ty .
As for the early his tory of chemis t ry in Croat ia , S. Miholic, in Bulletin Scientifique, 3 (2) , 33, s ta tes , "One can almost say t h a t the a l -chemistic period in chemistry lasted in Croat ia t i l l t he middle of the 19th century. T h e only other exper imenta l work in chemistry was t h e number of analyses of Croat ia mineral waters made by apothecaries, of which some are r emarkab ly well done. T h e opening of the first technological middle school in Zagreb in 1854 marked the beginning of a new era. I n 1856 the first course of experimental chemistry was delivered a t t h a t school by Canon J . Torba r (1824-1900·) phys icist and later president of t h e Yugoslav Academy of Sciences. F r o m 1859 the course in .chemis t ry was given by P . Zulic, who wrote the first textbook of chemistry (1866). A further step was made when the Univers i ty of Zagreb was
Micro DTA & DSC in 1 instrument?
Detection of an Extremely Small Peak (C).
Probe: GS(25 /Λ) Sample: Tri-caleinm silicate— 37 mg. Sensitivity: 20 μν full scale Reversible crystalline transitions in the 900 to 1,000°C range. Tiny peak (C) distant only 10° C from peak (B) is perfectly detected. ΔΤ signal for peak (C) does not exceed 0.02°C.
PrécisetnentS The fourth generation micro thermal analyzer developed by Professor Mazieres of the University of Paris is now available in the U.S. through the Infotronics sales and service organization.
The M.-4 DTA measures temperature differentials in the —160°Cto + 1600°C range with 0.1°C resolution. Temperature is programmed by a front panel switch at rates of 1°C to 20°C/min. Full atmospheric control is maintained with inert gas in the sample cavity.
But that's only part of the story. The M-4 also fund ions τ effectively as a differential scanning calorimeter—wit] H»I 11 the use of special cells. Quantitative measurement?· >.. η be obtained with excellent accuracy and with little calibration.
Key to the M-4's sensitive performance for DTA and DSC lies in its patented probe design which features three hollow thermocouples. Extremely high efficiency of detector operation is the result of close contact with small sample sizes— 0.6 μΐ tO 25 μ\. Applications include all phases of organic and inorganic chemistry, such as polymers, elastomers, crystallography, ceramics, metallurgy, and quality control of feeds, foods and pharmaceuticals. To learn more, write for Data File DTA-4.
INFOTRONICS C O R P .
1062 Linda Vista Avenue Mountain View, California 94040 P h o n e ( 4 1 5 ) 9 6 8 - 9 7 1 0
Circle No. 103 on Readers' Service Card
ANALYTICAL CHEMISTRY, VOL. 4 1 , NO, 14, DECEMBER 1969 · 69 A
Editors' Column
established in 1874. The first professor of chemistry A. Velkov appointed in 1875, and a laboratory of chemistry opened in 1876."
MOLECULAR MOVEMENT STUDIED BY LASER
Two scientists from the Akron University's Institute of Polymer Science have reported at the national meeting of the Society of Rheology (St. Paul, Minn., Oct. 19-22) the development of a laser device for measuring molecular movement.
Coherent red light from a six-foot laser tube is passed through a solution of polymer macromole-cules, whereupon a Doppler shift occurs that is detected by a photoelectric cell. Circuitry developed by the researchers, Dr. J. E. Frederick and Thomas F. Reed, filters noise and separates and records various frequencies and their harmonies.
The laser tube for the apparatus is mounted on a one-ton concrete slab supported by steel " I " beams, and the entire system of laser tube, glass vessel for sample, and photocell are supported on heavy springs to absorb vibrations above 10 Hz.
We are encouraged to remark that although the implementation •of laser devices in 'analytical and associated instrumentation has been slow, there are a t least encouraging signs that progress is being made, however deliberate the pace continues.
NEW MASS SPECTROMETER
A new mass spectrometer which weighs less than 2 oz, using three mesh electrodes has been developed by General Electric. Ions in gases are sorted according to their masses in the three-dimensional quadrupole electric field inside the electrodes, and a electron multiplier device is used to measure the number of trapped ions. Further information will appear in a later issue.
No sacrifice in response or efficiency. Choose a Sargent combination pH electrode by size alone.
Both of these Sargent combination pH electrodes cover the entire pH range from 0 to 14 pH. Both offer fast, linear response-even in highly acid solutions. Response to alkali ions is insignificant below pH 12.5 (at higher pH, response is low and stable). Both electrodes achieve high efficiency, with a mil l ivcIt /pH response close to the Nernst coefficient. And you get this kind of performance over a range of 0 to 80°C. These electrodes also feature all-glass, shock-resistant construction. No rubber or plastic to contaminate samples. No pockets to trap solutions or hamper cleaning. Stainless-steel caps provide sure, strong clamping. What's the différence, then, between these two combination pH electrodes? Size alone. For samples as small as Vz ml or those in extremely confined volumes, choose the miniature electrode (priced at $42.00). Otherwise, your best choice is the standard-size ($40.00). Both come with connecting cable and plugs to fit all popular pH meters. Call your Sargent man or write to us for a closer look at these combination pH electrodes or for data on our complete line of glass and reference electrodes.
SARGENT-WELCH Scientific instruments, apparatus, chemicals. Sargent-Welch Scientific Company 7300 N. Under Ave.; Skokie, Illinois 60076
Chicago/Anaheim/Birmingham/Cincinnati Cleveland/Dallas/Denver/Detroit Springfield, N.J./Toronto/Montreal/Vancouver
Circle No. B5 on Readers' Service Card ANALYTICAL CHEMISTRY, VOL. 4 1 , NO. 14, DECEMBER 1969 · 71 A
