In the analysis of Dioxin/Furan, holding times are a minor concern as dioxin is a very stable compound and not subject to loss or degradation when handled in accordance with internal standard operating procedures. Many of the EPA method holding times are recommendations only (normally from time of sampling)—and these are indicated with “*” below. Finally, most holding times are longer than standard turnaround times and rarely become an issue in dioxin testing.

Method
Extraction
Analysis
8280A
30 days *
45 days *
1613B
1 year
40 days
8290
30 days *
45 days *
23
30 days *
45 days *
TO-9
7 days
45 days *
1668
1 year
40 days