Problem identified with NIOSH method 7902.
Appl Ind Hyg 1988 Nov; 3(11):302
A problem with NIOSH Method 7902 was discussed. The technique was designed to distinguish between particulate fluorides, such as cryolite (15096523), and gaseous hydrogen-fluoride (7664393) (HF). The sampler consisted of two 37 millimeter cassettes connected by a length of plastic tubing. Observations have indicated that significant amounts of HF are absorbed by the backup pad supporting the particulate prefilter and by the prefilter itself; the result would be serious underestimation of the amount of gaseous fluoride being measured. Interaction of gaseous HF with particulate matter deposited on the prefilter was another concern cited. The authors recommend that all parts of the sampler be analyzed and that results be used as an index of total fluoride.
NIOSH-Author; Analytical-methods; Chemical-analysis; Particulates; Fluoride-compounds; Samplers; Sampling-equipment
Applied Industrial Hygiene