Continuous Hydrogen Sulfide Monitor Based on Positive Fluorescence Green Chemistry. Application to Geothermal Powerplant Environmental Impact Assessment

Résumé fourni par la source

S analyzer based on this green chemistry, comprising a disposable gas scrubber with controlled liquid flow at 50 μL/min and a UV-laser based fluorescence detector, is reported. The instrument operates on a (4 min sample, 6 min zero) reporting the difference signal via a Raspberry Pi controller to the cloud every 10 min with a working range of 0.3 ppb (limit of detection) to >100 ppb. During each cycle a total of 0.8 L air and 1 mL aqueous solution containing 5 μmol NaOH, 10 μmol 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid, 40 nmol HQS, and 20 nmol each of Cu and Zn are consumed with a total chemical cost < USD $0.01. Performance characteristics and data from a geothermal field are reported. It provides far superior sensitivity and time resolution than conventional impinger absorption and colorimetry. It should find wide use in geothermal environmental assessment and for monitoring oil drilling and storage sites, paper-pulp and sewage treatment facilities, livestock management, etc.

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