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. 2015 Jul 13;10(7):e0132441. doi: 10.1371/journal.pone.0132441

Table 4. Assessment of purity of metagenomic DNA by methods M1 to M6 for different soils.

A260/280 A340
Methods Garden soil Sewage sludge Lake soil Compost Garden soil Sewage sludge Lake soil Compost
M1 1.14 ± 0.02 1.22 ± 0.03 1.22 ± 0.09 1.29 ± 0.04 0.09 ± 0.03 0.08 ± 0.02 0.09 ± 0.03 0.08 ± 0.01
M2 1.53 ± 0.06 1.48 ± 0.03 1.56 ± 0.01 1.40 ± 0.07 0.06 ± 0.02 0.07 ± 0.03 0.08 ± 0.02 0.06 ± 0.04
M3 1.32 ± 0.03 1.25 ± 0.05 1.34 ± 0.01 1.37 ± 0.06 0.07 ± 0.01 0.08 ± 0.03 0.06 ± 0.04 0.06 ± 0.05
M4 1.33 ± 0.05 1.34 ± 0.06 1.46 ± 0.09 1.48 ± 0.03 0.09 ± 0.04 0.08 ± 0.02 0.08 ± 0.03 0.09 ± 0.02
M5 1.60 ± 0.04 1.62 ± 0.08 1.56 ± 0.03 1.50 ± 0.07 0.06 ± 0.04 0.06 ± 0.03 0.07 ± 0.08 0.08 ± 0.01
M6 1.82 ± 0.08 1.72 ± 0.04 1.78 ± 0.02 1.73 ± 0.05 0.04 ± 0.03 0.06 ± 0.04 0.05 ± 0.01 0.04 ± 0.06

A260/280 represents protein contamination. A340 is an indication for humic acid presence.