1) What do the results suggest? 2) Compare PBOC and solid-phase TOC concentratio

Question

1) What do the results suggest?

2) Compare PBOC and solid-phase TOC concentrations for each location. Are there any locations and depths with generally have higher carbon levels?. If so, what would you contribute to this increase or variability in carbon levels?

3) Discuss some of the limitations of this type of analysis in regards to trying to determine carbon fractions needed to support microbial processes in the environment.

4) What are some practical applications for this type of analysis?

Solid-phase, TOC, (mg/kg) 2300 4195 1130 725 2230 Depth Interval Boring Location PBOC (mg/kg) 112.7 426.7 7.0-8.0 8.0-9.0 10.0-11.0 13.0-14.0 14.0-15.0 16.0-17.0 18.0-19.0 7.0-8.0 9.0-10.0 11.0-12.0 13.0-14.0 15.0-16.0 18.0-19.0 21.0-22.0 7.0-8.0 9.0-10.0 11.0-12.0 13.0-14.0 14.0-15.0 18.0-19.0 19.0-20.0 7.0-8.0 10.0-11.0 11.0-12.0 13.0-14.0 15.0-16.0 16.0-17.0 18.0-19.0 19.0-20.0 MCRD Site 45- Boring 1 MCRD Site 45- Boring:1 MCRD Site 45- Boring:1 MCRD Site 45- Boring 1 MCRD Site 45- Boring 1 MCRD Site 45- Boring:1 MCRD Site 45- Boring:1 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 2 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 3 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 MCRD Site 45 Boring 4 250.6 63.9 958.4 223.7 12800 1120 647.5 589.5 1525 1680 387.5 12295 3335 2980 383 2200 412.5 469.7 128.8 233.3 582.1 157.6 161.1 17.5 192.3 192.2 1349.3 313.5 54 450 397 184.6 147.9 354 2531.6 1400 2335 1151.4 79830

Explanation / Answer

These results suggested that an estimate for threshold amounts of PBOC present in aquifer sediments which need to provide the reductive dechlorination in groundwater systems in the above-mentioned locations. PBOC is 5-10 times lower than TOC. PBOC was measured using aquifer sediment samples collected at varying depths of a chloroethene plume.

MCRD site 45 boring 1,2,4 are shown a high concentration of carbons. This indicates that higher carbon level. Sediment samples showed the minimal to moderate chloroethene exposure were expected to have higher PBOC concentration.

This analysis can not only support to determine the microbial degradation status. Dissolved oxygen measurement is necessary for that. Complete bioassay is necessary.

This analysis can imply to found the characteristics of sediments with their chlorination profile and reductive nature so that utilization/ limitation of groundwater can be monitored.

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