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. Author manuscript; available in PMC: 2016 Nov 21.
Published in final edited form as: Res Rep Health Eff Inst. 2012 Dec;(172):5–82.

Table 4.

Findings from Eight Laboratory Spiked Samples Taken to Estimate the Blank and LOD for Each Compound

Compound Meana
(ng)		 Biasb
(Mean − 4)		 SD IDLc
(SD × 3)		 LODd
(µg/m3)
1,3-Butadiene 4.46 0.46 0.29 0.86 0.11
MTBE 4.82 0.82 0.17 0.51 0.07
2-Methylpentane 5.43 1.43 0.16 0.48 0.06
3-Methylhexane 5.03 1.03 0.18 0.55 0.07
2-Methylhexane 5.19 1.19 0.17 0.51 0.07
2,3-Dimethylpentane 5.05 1.05 0.15 0.46 0.06
2,2,4-Trimethylpentane 5.37 1.37 0.21 0.62 0.08
Methylcyclohexane 4.90 0.90 0.17 0.51 0.07
Benzene 6.00 2.00 0.18 0.55 0.07
Toluene 5.41 1.41 0.43 1.28 0.16
m&p-Xylenes 7.64 3.64 0.43 1.30 0.16
Ethylbenzene 3.90 − 0.10 0.18 0.55 0.07
Styrene 3.69 − 0.31 0.28 0.84 0.11
o-Xylene 3.64 − 0.36 0.28 0.84 0.10
a

Sampling tubes were spiked with 4 ng of each compound.

b

The bias (contamination) is the difference between the amount spiked and that measured.

c

Instrument detection limit.

d

The LOD is the IDL divided by the volume sampled, typically 7.2 L (ng/L = µg/m3).