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How the process works  


Map Traps are deployed for 2-5 days

Map Traps are processed and analyzed

A comprehensive report is received 


What is included

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Analysis and Corrections


Travel Blank

To ensure accuracy, each shipment of Map Traps includes a Travel Blank. The Travel Blank acts as a control to capture CO₂ due to handling and travels to and from the site. The processed Travel Blank also accounts for a relatively small mass of CO₂ present in the sorbent from the manufacturing process.

The Travel Blank is never opened; when shipped, the travel blank captures any CO₂ to which the samples are exposed. When the other Map Traps are deployed, the Travel Blank is kept in a "safe bag" to ensure no unnecessary CO₂ absorption takes place.  The Travel Blank is taken out of the 'safe bag' prior to the return shipment to again capture environmental CO₂. The carbon levels of the Travel Blank are analyzed and are then subtracted from the carbon levels of the rest of the analyzed samples: Blank Corrected Results = Raw Results - Travel Blank.

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Qualitative Radiocarbon Analysis

Total CO₂ flux captured by the Map Trap represents a two-source model, with CO₂ generated from natural soil organic matter (modern carbon) and LNAPL (fossil fuel carbon). The bottom sorbent sample in each Map Trap undergoes a qualitative radiocarbon (¹⁴C) analysis. As opposed to the Fossil Fuel Traps, Map Traps determine the presence of fossil fuel derived carbon in the sample rather than quantifying actual NSZD rates.

Fossil fuel carbon can be differentiated from modern carbon through the use of the carbon isotope ¹⁴C, which has a half-life of about 5700 years. Fossil fuel contains an undetectable amount of ¹⁴C since it is millions of years old. E-Flux therefore analyzes sorbent samples for ¹⁴C to determine the presence of modern carbon in a sample.

For more information on ¹⁴C dating see "Basis for ¹⁴C Analysis."


    Our Report

    Report tables have four parts: Map Trap deployment description, raw results, blank-corrected results, and binary (yes/no) ¹⁴C presence results.

    All generated data is confidential between E-Flux and the customer. Site data shared with E-Flux for discussion purposes are not shared with new customers unless a single client orders multiple batches of Map Traps for the same site and wishes a more in-depth report. E-Flux will provide in-depth discussion of report results at the customer’s request, but we will not provide consulting advice; use of data is ultimately up to the customer.


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