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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: J Occup Environ Hyg. 2016 Jan;13(1):30–39. doi: 10.1080/15459624.2015.1072278

Table 4.

Background metal content of filter substrates.

Filter substrate PVC MCE
SEM images Metal graphic file with name nihms757303u1.jpg graphic file with name nihms757303u2.jpg
Metal content (μg/g) Metal content (μg/filter) LOD (μg/filter) LOQ (μg/filter) Metal content (μg/g) Metal content (μg/filter) LOD(μg/filter) LOQ (μg/filter)
Ti 5.3 ± 0.5 0.063 ± 0.006 0.08 0.13 ND ND – –
Fe 15.8 ± 6.9 0.19 ± 0.084 0.44 1.0 2.1 ± 0.6 0.09 ± 0.02 0.2 0.3
Cr 6.1 ± 0.5 0.074 ± 0.006 0.09 0.14 2.3 ± 0.4 0.1 ± 0.02 0.1 0.3
Mn ND ND – – ND ND – –
Ni ND ND – – ND ND – –
Cu ND ND – – ND ND – –
Cd ND ND – – ND ND – –
Zn 1.4 ± 0.1 0.017 ± 0.001 0.02 0.03 5.2 ± 0.5 0.2 ± 0.01 0.2 0.3

Note: Values for metal content represent mean and standard deviation of three replicates. ND = not detected. Values expressed as per filter are provided for 37-mm filters.