What is the holding time for ASTM D5504?
A. According to ASTM D5504, samples collected in Tedlar bags must be tested within 24 hours of sampling. The 24-hour hold time is also specified in SCAQMD 1150.1 (for California requirements—South Coast Air Quality Management District) for sulfur testing. Sulfur-containing compounds may also be collected in specially prepared canisters that are lined with a glass-like substance (such as Silco© canisters). While manufacturers of such canisters may list extended hold times, it is our goal to analyze these samples within 24 hours of sampling.
