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2,4-D.

Authors
NIOSH
Source
NIOSH 1978 Oct:22 pages
Link
NIOSHTIC No.
00134258
Abstract
An analytical method was developed for the determination of airborne concentrations of 2,4-dichlorophenoxyacetic-acid (94757). The method consisted of collection of the sample on a glass fiber filter, extraction with methanol, and analysis by high pressure liquid chromatography. Validation was performed by analysis of 18 spiked samples containing 50, 100, and 200 percent of the OSHA standard of 10 milligrams per cubic meter (mg/m3), and 18 samples from dynamically generated test atmospheres. The collection efficiency of the glass fiber filter, storage stability of the samples, and precision and accuracy of the method were assessed. The range of concentration was 5.1 to 20.3mg/m3. Collection efficiency of the filter was 0.99. Samples collected and analyzed immediately and after 7 days of storage contained a mean of 10.10 and 10.02mg/m3, respectively. The total coefficient of variation was 0.051. The authors conclude that the advantages of the method are that the collection is simple and involves no liquids, and analysis quick. The precision of the method is limited by the reproducibility of the pressure drop across the filter. Esters of the chemical are not measured.
Keywords
NIOSH-Author; NIOSH-Analytical-Method; Analytical-Method; Standards; Sampling; Standards-Completion-Program; SCP; Set-7; Chemical-properties;
CAS No.
94-75-7;
Publication Date
19781001
Fiscal Year
1979
NTIS Accession No.
PB-288629
NTIS Price
A11
NIOSH Division
DPSE;
Source Name
Ten NIOSH Analytical Methods, Set 6, Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, NTIS PB288-629, 22 pages, 8 references
State
OH;
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