Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
Quantifying Uncontrolled Landfill Gas Emissions from Two Florida ...
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Table 3-36. Total Mercury Sample Concentrations <strong>from</strong> Site #2<br />
Sample /<br />
Well Location<br />
Total Mercury <strong>Gas</strong><br />
Concentration (ng/m 3 )<br />
Spike Recovery<br />
(%)<br />
<strong>Gas</strong> Sample 1 36 NA<br />
<strong>Gas</strong> Sample 2 47 NA<br />
<strong>Gas</strong> Sample 3 47 NA<br />
Lab Spike NA 89.9<br />
Lab Spike Duplicate NA 97.6<br />
3.2.6 Dimethyl Mercury Measurements<br />
Dimethyl mercury concentrations in the landfill gas at Site #2 ranged <strong>from</strong> 0.69 to 9.19 ng/m 3<br />
with an average of 5.66 ng/m 3 . Spike recoveries for the dimethyl mercury traps were 1.9 percent.<br />
Un-sampled spike traps had recoveries <strong>from</strong> 87.4 to 89.9 percent with an average of 88.7<br />
percent. Recoveries for the spiked/sampled traps were significantly lower than the acceptance<br />
criteria of 50 to 150 percent. This is possibly due to the presence of an unknown interfering<br />
compound either destroying or masking the detection of the dimethyl mercury. For this reason,<br />
all of the dimethyl mercury results <strong>from</strong> this campaign must be labeled as suspect. Sampling was<br />
performed at approximately 10 times the necessary volume to collect a valid sample. Table 3-37<br />
presents the dimethyl mercury concentration data <strong>from</strong> Site #2.<br />
Table 3-37. Dimethyl Mercury Sample Concentrations <strong>from</strong> Site #2<br />
Sample / Well Location<br />
Dimethyl Mercury <strong>Gas</strong><br />
Concentration( ng/m 3 )<br />
Spike Recovery<br />
(%)<br />
<strong>Gas</strong> Sample 1 7.09 NA<br />
<strong>Gas</strong> Sample 2 0.69 NA<br />
<strong>Gas</strong> Sample 3 9.19 NA<br />
Spike Sample(front/back) NA 1.9<br />
2nd Source Standards (1490 ng/L) NA 87.4<br />
2nd Source Standards (1000 ng/L) NA 89.9<br />
3.2.7 Monomethyl Mercury Measurements<br />
Monomethyl mercury concentrations in the landfill gas at Site #2 ranged <strong>from</strong> 0.06 to 0.31 ng/m 3<br />
with an average of 0.16 ng/m 3 . The matrix spike recovery for the monomethyl sample was 62.6<br />
percent. Spike recoveries for un-sampled impinger solution ranged <strong>from</strong> 91 to 102 percent with<br />
an average of 97 percent. The lower recoveries may have been due to a preservation issue with<br />
the shipping or possible matrix interference as seen in the matrix spike. Table 3-38 presents the<br />
monomethyl mercury concentration and QA/QC data <strong>from</strong> Site #2.<br />
3-37