Duran glass

An interesting example of the contamination risks which may be caused by a laboratory vessel is that of boron. Determination of very low boron concentrations, involves a prior separation by distillation and subsequent analysis by spectrometry, with a suitable reagent such a curcumin or carminic acid. The use of laboratory vessels made of borosilicate glass (such as Duran or Pyrex) could lead to very large errors in the boron content found. Such errors are caused by sample contamination from the boron present in the glassware. 

Reservoirs Duran Schott glass without caps and rings, 5- and 2-L capacity. 

Many disposable glass laboratory items are made of soft glass. If a laboratory glass item does not specifically bear one of the words Pyrex , Kimax , or Duran in printed or raised letters, it is likely to be a soda-lime type of glass. 

Practical Hints on Processing Duran , prepared by Schott Glass. 

A single crystal could be grown in situ on the diffractometer in a sealed Duran glass capillary, which made it possible to determine the structure in the solid state (Fig. 2). 

Duran (or other wide-necked glass) bottles. Due to the hazards associated with this procedure (see Note 2) minimize the possibility of leakage by ensuring that the bottles have a good seal. 

Duran (or other wide-necked glass) bottles (see Subheading 2.1.1.). 

Observe interface carefully if clear, re-extraction is not necessary (see Note 7). Remove phenol from bottom of tube using glass 5-mL pipet or Pasteur pipet and rubber pipet bulb or pipet pump. Do not worry about taking some of the aqueous layer. Pour off supernatants into Duran bottle of appropriate capacity. 

Lift out DNA on glass pipet and transfer to smaller Duran. Wash 3 times with ethanol at room temperature by vigorous shaking and water vacuum pump aspiration of the ethanol. Make sure DNA spreads out in ethanol to ensure complete penetration of ethanol. 

Becker et al, Wuppertal 420 1 Duran glass, evacuable, thermostated -50 to +50 °C gas phase studies... 

Zetzsch et al, Hannover, now Bayreuth ca. 30001, Duran glass, thermostated -25 "C to ambient temperature aerosol studies... 

Two other chambers were built in Germany, at the same time, for the study of aerosol processes. Already in 1986, Zetzsch and coworkers built in Hannover a 3000 1 Duran-glass indoor chamber, covered inside with FEP, and irradiated by solar simulators. This facility has recently been moved to Bayreuth. In 1990, Schurath and co-workers (see contribution in this book) built in Karlsruhe a 84 m stainless steel chamber called AIDA, which could be operated between -90 and +60 °C. EUPHORE will be described later in more detail. Other groups also now operate medium sized chambers Baltensperger in Zurich, Wenger in Cork, Le Bras in Orleans, Herrmann in Leipzig, Hjorth in Ispra and Doussin in Paris. 

A solution of 0.85 g (5.18 mmol) of 1.1.15b, 1.4 g (13.85 mmol) of triethylamine (2.5 eq.) and 100 )iL of decane in 20 nfL of dry acetonitrile was degassed by argon bubbling and distributed among 10 mL Duran glass tubes. After purging the tubes with argon for 1 min, they were sealed and irradiated for 120 h in a Rayonet reactor fitted with 300 nm lamps and a merry-go-round inset. The solvent was evaporated and purification by HPLC (cyclohexane/ethylacetate 93 7) yielded 0.352 g (41%) of 1.1.15c. 

FILTER GLASS P = pyrex Q = quartz V = vycor D = duran S = solidex Si = silica ... 

---