Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
3579588
Reference Type
Journal Article
Title
Viscous Calibration Liquids for Self-Diffusion Measurements
Author(s)
Harris, KR
Year
2015
Is Peer Reviewed?
Yes
Journal
Journal of Chemical and Engineering Data
ISSN:
0021-9568
EISSN:
1520-5134
Publisher
American Chemical Society
Location
WASHINGTON
Volume
60
Issue
12
Page Numbers
3506-3517
Language
English
DOI
10.1021/acs.jced.5b00246
Web of Science Id
WOS:000366339800005
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-84949674912&doi=10.1021%2facs.jced.5b00246&partnerID=40&md5=cb765d243af8805836d896484c269700
Exit
Abstract
Self-diffusion measurements made by steady or pulsed field gradient spin echo NMR are not absolute and the magnetic field gradients employed must normally be determined by calibration with liquids with known self-diffusion coefficients. The primary calibrant is water, with self-diffusion coefficient values having been extrapolated from the tracer diffusion of HDO and of HTO in ordinary water by Mills,(1) with a relative standard uncertainty of 0.2 %. This and other liquids presently used for calibration all have low viscosities. Current work on ionic liquids, which are generally quite viscous, suggests there may be problems with the pulsed field gradient (PGSE) techniques usually employed as results dependent on the time interval between gradient pulses have been reported by Hayamizu et al.(2) In this work, self-diffusion coefficients, obtained by a steady gradient (SG) technique, are reported for the viscous molecular liquids squalane, ethylhexyl benzoate, and bis(ethylhexyl) phthalate (DEHP), and it is suggested that these substances may be suitable secondary reference materials for the calibration of spin echo NMR apparatus when self-diffusion in viscous liquids is to be measured. New PGSE measurements for squalane and DEHP are in good agreement with the SG results. We also report on systematic errors found in the secondary calibration data of Holz et al.(3) for cyclohexane, n-dodecane, dirnethyl sulfoxide, and pentan-l-ol (though not for 1,4-dioxane) and suggest toluene in their place as a more convenient low-viscosity calibrant that is also suitable for low temperature work.
Keywords
Calibration; Diffusion; Diffusion in liquids; Dimethyl sulfoxide; Liquids; Nuclear magnetic resonance; Spin polarization; Systematic errors; Temperature; Viscosity; Magnetic field gradient; Molecular liquids; Pulsed field gradients; Pulsed-field-gradient spin-echo-nmr; Reference material; Self-diffusion coefficients; Self-diffusion measurement; Standard uncertainty; Ionic liquids
Tags
OPPT
•
Squalane
Literature Search
Fate
WOS (private)
OPPT REs
•
OPPT_1,4-Dioxane_C. Engineering
Data screening total
Screening: Excluded
•
OPPT_1,4-Dioxane_D. Exposure
Total – title/abstract screening
Off topic
Supplemental Search
•
OPPT_1,4-Dioxane_E. Fate
Total – title/abstract screening
Off topic
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity