Page:NIOSH Manual of Analytical Methods - 7906.pdf/6

 PARTICULATE FLUORIDES and HYDROFLUORIC ACID: METHOD 7906, Issue 2, dated 20 May 2014 - Page 6 of 6

METHOD WRITTEN BY: Dietmar Breuer, Dr. rer. nat., and Petra Heckmann, Institute for Occupational Safety and Health of the German Social Accident Insurances, Sankt Augustin, Germany; and Kevin Ashley, Ph.D., NIOSH/DART Disclaimer:	 Mention of any company or product does not constitute endorsement by the National Institute for Occupational Safety and Health. In addition, citations to Web sites external to NIOSH do not constitute NIOSH endorsement of the sponsoring organizations or their programs or products. Furthermore, NIOSH is not responsible for the content of these Web sites. All Web addresses referenced in this document were accessible at the time of publication.

FIGURE 1.

HF recovery as function of relative humidity

TABLE 1. Performance evaluation for HF and F- ion measurements from test atmospheres [5] Concentration Analyte Sr1 (n = 6) RSD2(%) U3 (mg/m3) HF 0.25 0.007 3.1 0.22 HF 1.2 0.044 2.8 0.21 HF 2.3 0.026 1.1 0.20 HF 5.0 0.099 2.0 0.11 Fluoride 0.04 0.002 3.8 0.19 Fluoride 0.52 0.006 1.3 0.12 Fluoride 2.95 0.009 0.3 0.11 Fluoride 5.9 0.065 1.1 0.11 1 Standard deviation for 6 test samples 2 Relative standard deviation 3 Expanded measurement uncertainty; k = 2 (calculated in accordance with EN 482 [15])

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition