. Author manuscript; available in PMC: 2015 Jul 13.

Published in final edited form as: Anal Methods. 2013 Apr 24;2013(5):2954–2963. doi: 10.1039/C3AY40083B

Table 4. Comparison of Airtec and NIOSH method 5040 results measuring EC in 90% humidity^a.

Average 8 h TWA EC concentration (μg m⁻³) via NIOSH method 5040	Average 8 h TWA EC concentration (μg m⁻³) via Airtec	Bias%
14.39 ± 1.37	16.66 ± 0.91	−15.77
135.87 ± 2.54	122.97 ± 7.73	9.49
229.89 ± 7.32	208.02 ± 8.61	9.51

95% confidence limits: student t × standard deviation/(number of samples)^0.5.⁴⁵

Table 4. Comparison of Airtec and NIOSH method 5040 results measuring EC in 90% humiditya.