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Determination of gaseous and particulate fluorides by ion chromatographic analysis.
Appl Occup Environ Hyg 1993 Sep; 8(9):775-784
Gaseous and particulate fluorides were analyzed using ion chromatographic (IC) analysis. Problems experienced with NIOSH Method 7902, which led to the present investigation, were divided into those related to chemical analysis, and those related to sampling. In order to resolve the former, IC which was more specific than ion selective electrode (ISE) potentiometry was used. Sampling problems were addressed by modifying the sampler. Experimental details were provided. The IC and ISE analyses were compared. Sampler interaction with hydrogen-fluoride (7664393) (HF), a possible source of loss of gaseous fluoride was addressed. An incubation study showed that the porous plastic support pads allowed recoveries in excess of 97% at two HF loading levels (32 and 204 micrograms (microg) and incubation times (24 and 48 hours (hr)). The adsorption of HF on sampled particulates was addressed. Of four eluants tested, sodium-tetraborate was the only one which resolved fluoride from all the expected peaks in typical workplace samples. HF recovery after a 90hr incubation time was 97% to 98% in the three piece cassette, at two loading levels (35 and 220microg). In four piece cassettes, the recoveries were 91% and 84% despite the cassettes being leak tight. Metal oxides in the sampler reduced HF recoveries. For particulate fluoride, the ISE method underestimated fluoride loading by 8.1% and 15.6% with 500 and 200microg/sample, respectively, while the IC method overestimated them by 8.5% and 15.5%, respectively. A field survey for gaseous and particulate fluoride was performed in an aluminum refining facility. The author concludes that the IC method should be considered as complementary to the existing NIOSH Method 7902.
NIOSH-Author; Airborne-particles; Analytical-methods; Chromatographic-analysis; Occupational-exposure; Fluorine-compounds; Particulate-sampling-methods
Issue of Publication
Applied Occupational and Environmental Hygiene