Beckman Instruments, Inc

---

REPORT FOR ANALYTICAL CHEMISTS

STOP GUESSING!

Put true precision and versatility in ratio recording. With the Beckman DB* Ultraviolet Spectrophotometer, it's yours for half what you'd expect to pay. See the entire 205-770 m μ spec­ trum at all times. Record all of it or any segment, and expand any 10%, 20%, or 50% to full scale. Simply team t h e DB ($2160), H y d r o g e n Lamp Power Supply ($290), Linear and Log Recorder ($700), Scale Expansion Accessory ($120). Total price: $3270.

Fora demonstration of the DB and accessories, contact your Beckman Lab Apparatus Dealer. Or write direct for Data File LUV-1S-162.

Beckman

INSTRUMENTS, INC.

SCIENTIFIC A N D PROCESS INSTRUMENTS DIVISION •TRADEMARKe.1.1.

FuHerfon, C a l i f o r n i a

Circle No. 33 on Readers' Service Card

32 A

·

ANALYTICAL CHEMISTRY

Quantitative analysis laboratory is given a modern, low, clean-swept appearance by eliminating utility pipes, racks, faucets, and outlets above bench top height. A large end sink is used. Commonly used reagents are kept on polyethylene trays on each bench top. This design is followed at Indiana University

M a n y small and medium-sized instruments can be placed in one large general instrument room. I n ­ cluded are colorimeters, ultraviolet and infrared spectrophotometers, refractometers, p H meters, titrimeters, fluorescence meters, gas chromatographs, etc. Only ordinary utilities are required including a regulated power supply. Air condi­ tioning and humidity control, how­ ever, are essential. Space needs are estimated by adding lengths of equipment items and allowing three to four feet be­ tween instruments. Special fea­ tures such as desks, repair bench with test equipment, and electronic supplies, locked cabinets, etc. are described. Some instruments, because of size, special utility requirements, or hazards in operation should be iso­ lated in smaller rooms. Those us­ ing mercury, such as polarographic instruments, some electrodeposition setups, and amperometric titrations require special ventilation. Spec­ t r o g r a p h s equipment with its dark room and ventilation needs is best segregated. X - r a y diffraction units should be isolated. Radioisotope measuring a p p a r a t u s should be iso­ lated and separated from x-ray

equipment. Flame photometers re­ quire special venting and com­ pressed gases. Microscopy benches and storage facilities must be con­ sidered if microscopy is taught. Inorganic Synthesis Laboratory. A laboratory for advanced inor­ ganic chemistry should be planned and equipped for synthesis, analy­ sis, and the study of physical prop­ erties of the compounds synthe­ sized. This type of laboratory is not often encountered in the United States. Such a course merges ana­ lytical, physical, and inorganic chemistry. I t involves facilities for work over a wide range of tempera­ tures, pressures, and atmospheres. This chapter discusses the desk, drawer, and cupboard space needs ; utility requirements, particularly vacuum; hoods and glove boxes; methods for obtaining low and high temperatures ; temperature control and recording; high and low pres­ sure equipment, ion exchange col­ umns with racks; electrochemistry needs; and radiation handling and counting equipment. If an instrumental analysis laboratory is available, such instru­ ments m a y be used by the inorganic analysis students, thus avoiding the duplication of facilities.