Table 3.

Recoveries of OPA vapor spikes from S10 LpDNPH samplers after storage at room temperature^a

Quantity of OPA vapor collected (µg)	Period of storage (days)	Quantity of OPA found (µg)	Recovery
0.71	3	0.68	95.8%
0.71	6	0.66	93.0%
0.71	10	0.61	85.9%
0.71	15	0.69	96.8%
5.17	3	5.15	99.6%
5.17	6	4.99	97.1%
5.17	10	5.24	101.3%
5.17	15	4.85	93.8%
14.5	3	14.4	99.3%
14.5	6	13.5	93.1%
14.5	10	12.2	84.1%
14.5	15	10.9	75.2%

^aAliquots of acetonitrile solutions of OPA were deposited on PTFE-GFFs, and pumps operated at 1.0 L min⁻¹ in a nitrogen atmosphere.