Table 2.

Concentrations of gas-phase CCl4 in live versus treated soil samples from boreal, subtropical, and tropical environmentsa

TreatmentConcn of gas-phase CCl4 (ppt)b
BorealSubtropicalTropical
None (live)27.09 ± 5.4934.39 ± 7.6623.54 ± 3.56
Control89.58 ± 0.0891.03 ± 0.1489.77 ± 0.29
Autoclaving89.68 ± 2.5388.27 ± 3.75ND
Dry heat87.04 ± 2.9294.56 ± 1.35ND
HgCl2 (2% [wt/wt])88.86 ± 0.68ND90.31 ± 1.08
  • a Soil samples (30 g) were incubated with 65 ml of atmospheric air for 17 h. Control syringes contained atmospheric air only.

  • b Values represent the means of triplicate samples ± 1 SD. ND, not determined.