Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Reagent Alcohol (Alcohol, Reagent) Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for Reagent Alcohol provides, in addition to common physical constants, a general description including typical appearance, applications, and density. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Water, Color (APHA), and Residue after Evaporation.
Note: This material is a denatured form of ethyl alcohol, approved for sale under U.S. regulations governing the stated description or equivalent, consisting of about 5 volumes of isopropyl alcohol and about 95 volumes of formula 3-A specially denatured alcohol (which consists of about 5 volumes of methanol and about 100 volumes of ethyl alcohol).
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . colorless liquid Applications . . . . . . . . . . . . . . . . . . . . . . . . solvent Density . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.79
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . within 94.0–96.0% (v/v) methanol and ethyl alcohol and 4.0–6.0% (v/v) isopropyl alcohol Maximum Allowable Water (H2O) . . . . . . . . . . . . . . . . . . . . . . . . 0.5% Color (APHA) . . . . . . . . . . . . . . . . . . . . . . . 10 Residue after evaporation . . . . . . . . . . . . . . . 0.001%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4316 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay Analyze the sample by gas chromatography using the general parameters cited in [Part 2: Chromatography; Recommended Procedures; Gas Chromatography]. The following specific conditions are also required. Column . . . . . . . . . . . . . . . . . . . . . . . . . . Type I, methyl silicone Measure the area under all peaks, and calculate the ethyl alcohol plus methanol and isopropyl alcohol content, correcting for response factors determined by injections of suitably prepared standards. Correct for water content.
Water [Part 2: Titrimetric Methods; Water by the Karl Fischer Method; Volumetric Procedure; Volumetric Procedure for Samples Using Karl Fischer Reagent, Method 1]. Use 10 mL (7.4 g) of the sample.
Color (APHA) [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)].
Residue after Evaporation [Part 2: Gravimetric Methods; Residue after Evaporation]. Evaporate 100 g (124 mL) to dryness in a tared, preconditioned dish on a hot plate (~100 °C), and dry the residue at 105 °C for 30 min.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4316 ACS Reagent Chemicals, Part 4
