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Ten NIOSH Analytical Methods - Hafnium.

Authors
NIOSH
Source
NIOSH 1979 Apr:25 pages
Link
NIOSHTIC No.
00134996
Abstract
The NIOSH validated method for the determination of hafnium (7440586) (Hf) is described. Ninety liters of air (flow rate at 1.5 to 2.0 liters per minute) is drawn through a mixed cellulose ester membrane filter to trap Hf. The sample and filter are digested successively with 3 milliliters (ml) of concentrated nitric-acid twice, 3ml of nitric-acid plus 5 drops of concentrated perchloric- acid, 1ml of nitric-acid plus 5ml of 5 percent hydrofluoric-acid, evaporating to dryness between each step except the last which is evaporated until a droplet of solution remains. Three to 5ml of 5 percent Hf were added. After cooling, the solution is added to a 10ml volumetric flask and filled to the mark with 5 percent hydrofluoric-acid. The solution is analyzed by emission spectroscopy at the wavelength of 264.1 nanometers. The concentration of Hf is determined by comparison with a calibration curve obtained by analyzing standards having concentrations equal to meter (mg/m3). The method is useful for determining Hf concentrations of 0.26 to 1.05mg/m3 with a standard deviation of
Keywords
NIOSH-Author; NIOSH-Analytical-Method; Analytical-Method; Standards; Sampling; Standards-Completion-Program; SCP; Set-7; Spectrographic-analysis; Heavy-metals;
CAS No.
7440-58-6;
Publication Date
19790401
Fiscal Year
1979
NTIS Accession No.
PB84-243336
NTIS Price
A03
NIOSH Division
DPSE;
Source Name
Division of Physical Sciences and Engineering, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, 25 pages, 5 references
State
OH;
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