Grades argon

Acetonitrile, pesticide grade or HPLC grade Acetone, pesticide grade or HPLC grade Methanol, pesticide grade or HPLC grade Argon, purity >99%... 

The PHSS was calibrated with step-wise additions of H2S stock while positioned in the respirometer chamber containing 3 ml stirred (500 rpm) 20 mM Tris-buffered zero-grade argon (<0.0003 kPa 02) equilibrated analytical grade purified water (Solution 2000, Jasper, GA), at the pH and temperature of the subsequent experiment. H2S... 

Argon. Commercial high grade argon was passed over BTS catalyst (BASF, Fluka) at 300°C. According to the literature, the oxygen content is thus reduced to a concentration of less than 0.1 p.p.m. 

The pre-mixed methane/argon mixture consisted of 1.2% methane and 98.8% argon, both being 99.99% Matheson research grade. Argon/ oxygen and zero air were used as oxidants. Prior to each run the driven section was evacuated with an oil difiFusion pump. Tests were conducted in shock-heated argon to determine possible interference from sodium impurities however, no ionization was detected. 

Vinylpyridine (2-VP) monomer was used as received from ICN-K K Laboratories. However, no impurities were detected by gel permeation chromatograjAiy or infrared spectroscopy. Monomer was thoroughly degassed by repeated freeze-punp-thawing under vacuum prior to use. Research grade argon (99.99% purity,... 

Since the carbides decompose in vacuum, the high-temperature sintering must be carried out in an atmosphere of technical-grade argon. The rods are heated to extremely high temperatures— just short of the melting point (for a description of this procedure, see TiN, p. 1234). Most of the impurities evaporate at these temperatures, leaving a relatively pure product. 

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