Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Mercury 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
Downloaded by CORNELL UNIV on June 8, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4220
ABSTRACT This monograph for Mercury provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Appearance and Nonvolatile Matter.
Hg
Atomic Wt 200.59
CAS No. 7439-97-6
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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silver-white liquid metal electrodes in polarography boiling point, 357 °C insoluble
SPECIFICATIONS Appearance . . . . . . . . . . . . . . . . . . . . . . . . Passes test Maximum Allowable Nonvolatile matter . . . . . . . . . . . . . . . . . . . 5 ppm
TESTS Appearance The mercury should have a bright mirror-like surface, free from film or scum. It should pour freely from a thoroughly clean, dry glass container without leaving any mercury adhering to the glass.
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4220 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Nonvolatile Matter
Note: In this case, because of environmental considerations, the manufacturer- or supplier-certified value may be accepted, provided company or organization policy allows this.
Downloaded by CORNELL UNIV on June 8, 2017 | http://pubs.acs.org Publication Date (Web): February 28, 2017 | doi: 10.1021/acsreagents.4220
Perform all tests in a fume hood. Transfer 200 g to a tared, preconditioned boat of 25–30 mL capacity. Place the boat in the approximate center of a glass combustion tube, about 350 mm long and 35 mm in diameter, and mount in a horizontal position. Fit the tube at one end with a removable closure. Bend the exit end downward at 90° to the horizontal, and draw it out so as to fit it into a one-hole rubber stopper held in the mouth of a suction flask. Cool the suction flask in an ice bath. Place the boat and sample in the tube, close the entrance end, and reduce the pressure to less than 15 mm of mercury. Heat gently until all the mercury has distilled from a quiet surface (without ebullition). Remove the boat, heat it in a muffle furnace at 800 °C for 15 min, and cool.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI:10.1021/acsreagents.4220 ACS Reagent Chemicals, Part 4
