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| Main Authors: | , , , , , , |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
ACS omega
2026
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| Online Access: | https://pubmed.ncbi.nlm.nih.gov/42146203/ |
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Table of Contents:
- Continuous Hydrogen Sulfide Monitor Based on Positive Fluorescence Green Chemistry. Application to Geothermal Powerplant Environmental Impact Assessment. Toda, Kei Kiyota, Taisei Matsuyama, Kyosuke Kawamoto, Yukihiro Saeki, Kentaro Ohira, Shin-Ichi Dasgupta, Purnendu K Renewable geothermal sources can be used for base-load power generation. Prior environmental impact assessment is needed, however, for HS emitted from wells and cooling towers. Detailed spatiotemporal HS concentration data need continuous monitoring by sensitive and fieldable HS analyzers. Fluorescein mercuric acetate (FMA), a toxic organomercuric reagent, has been a staple for HS measurement. We report a reagent containing copper 8-hydroxyquinoline-5-sulfonic acid (HQS) complex and Zn. As HS from sample air bearing HS reacts with such a reagent, thiophilic copper forms the hydrosulfide, and the released HQS forms a fluorescent zinc chelate. An automated fieldable HS 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.