what is spectroquality? The name Spectroquality was originated by MC&B to identify a group of specially prepared solvents of higher purity than the solvents generally available for spectrophotometric use. Typical differences between MC&B Spectroquality Solvents and other spectrophotometric solvents are illustrated in the tracings. The preparation of MC&B Spectroquality Solvents requires a knowledge of spectrophotometry and a background of synthesizing and purifying organic chemicals. An example of this concerns an addition to our Spectroquality line, Heptane, SG5234 (see above). We had several requests from different quarters for a Spectroquality Heptane. We were aware that this material was a good non-polar solvent, and theoretically, if pure, should not absorb in the ultra-violet and in addition should provide several large windows in the infra-red region. On checking the commercial product we noted spurious characteristics in the U.V. with a cut-off at 240 mu, and we sought to correct this by fractionation. Our success was limited. However, a combined chemical treatment to remove olefins followed by fractionation produced a product with a cut-off below 210 mu. The infra-red tracing was as it should be, and our theory seemed to be well founded. Spectroquality Solvents are listed in the current MC&B Catalog. Write for your copy. Write for Free Booklet "SPECTROPHOTOMETRY AND THE CHEMIST"
These typical curves were run on a Beckman DK-2. The MC&B sample waâ~ selected at random from our stock. We purchased samples "A", " B " and "C" on the open market. All were designated as suitable for spectrophotometric use
Matheson Coleman & Bell Division of The Matheson Company Norwood (Cincinnati), Ohio; East Rutherford, New Jersey
