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 TETRANITROMETHANE: METHOD 3513, Issue 1, dated 15 August 1994 - Page 3 of 3

11.

reanalyze and apply the appropriate dilution factor in calculations. Measure peak area.

CALCULATIONS: 12. 13.

Determine the mass, µg, of tetranitromethane found in the impinger sample (W) and average media blank (B). Calculate concentration, C (mg/m 3), of tetranitromethane in the air volume sampled, V (L):

EVALUATION OF METHOD: This method was validated over the range of 2.70 to 11.5 mg/m 3 at 19 °C and 763 mm Hg using a 250L sample [1]. Collection efficiency was 0.895 ± 0.01 at 11.5 mg/m 3; this was used as a correction factor in the validation experiments. The overall precision ( SˆrT) was 0.076 and the bias was not significant [1]. In a later study, the LOD was determined to be 5 µg per sample and the analytical precision was 0.011 [2]. Tetranitromethane was stable for 14 days in 15-mL ethyl acetate solution. However, it is recommended that the samples be stored under refrigeration.

REFERENCES: [1] [2] [3]

NIOSH Manual of Analytical Methods, 2 ed., Vol. 3, S224, DHEW (NIOSH) Publication No. 77157-C (1977). Pendergrass, S.M. Method Development for Tetranitromethane, MRSB, DPSE, NIOSH (unpublished, 1991). Hawley's Condensed Chemical Dictionary, 11th ed., N.I. Sax and R.J. Lewis, Eds. Van Nostrand Reinhold Co., New York (1987).

METHOD REVISED BY: Stephanie M. Pendergrass, NIOSH/DPSE.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94