Volume 2, Issue 4 (April 2005)
Evaluation of Quartz Residue on Cassette Interiors of AIHA Proficiency Samples
Air generated quartz samples have been used for many years in the American Industrial Hygiene Association (AIHA) Proficiency Analytical Testing (PAT) program. It has been observed by the Wisconsin Occupational Health Laboratory (WOHL) that there is material adhering to the cassette interior of several PAT samples. WOHL has collected data on this problem for a number of AIHA PAT rounds and found that the cassette tops can contain a significant amount of quartz. Using data collected from PAT Rounds 146–155, it was found that half of the samples contained quartz on the cassette interior above the WOHL reporting level (RL) of 10 µg. The quartz on the cassette interior is one possible explanation for some of the performance issues found in laboratories participating in the AIHA PAT proficiency program. This problem is not unique to PAT samples. WOHL has noticed the same issue with field samples, which can lead to lower levels of quartz being reported.