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<p>[QUOTE=&quot;Michael H Webb, post: 3752660, member: 93313&quot;]This is true.</p><p><br /></p><p>Acetone is such a good organic solvent that pure acetone is only <i>theoretically</i> available in the lab where it&#039;s distilled.</p><p><br /></p><p>It takes additional solvents to remove acetone impurities using a probe sonicator.</p><p><br /></p><p>Tub style ultrasound is not sufficient since the only solvent that may be used in the tub is distilled water. Use of other solvents present a fire hazard. Also, differences in acoustics could burnout the acoustic generator.</p><p><br /></p><p>Differences in surface tension among solvents make sonication necessary near the target surface.</p><p><br /></p><p>&quot;Acetone HPLC Grade&quot; has the least residue at 5 ppm.</p><p><br /></p><p>Thank you for asking.[/QUOTE]</p><p><br /></p>

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