Nontarget LC-HRMS maps Dhaka river pollution
Open-science LC-HRMS of 12 sites on four rivers near Dhaka found tens of thousands of chemical features, including urban surfactants, pesticides, and pharmaceuticals, in a rarely monitored South Asian waterscape.
Source
Nontarget Analysis of Polluted Surface Waters in Bangladesh Using Open Science Workflows
Study at a glance
- Design
- Cross-sectional — Open-science LC-HRMS nontarget survey of surface waters near Dhaka
- N
- N=12 · 12 sites on four rivers (Buriganga, Meghna, Shitalakshya, Turag)
- Population
- Surface-water samples from rivers near Dhaka, Bangladesh
- Outcome
- Nontarget chemical features including surfactants, pesticides, and pharmaceuticals
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Authors sampled 12 sites on the Buriganga, Meghna, Shitalakshya, and Turag rivers and ran complementary ESI/APCI nontarget LC-HRMS with an open workflow, annotating suspects and confirming some Level-1 standards.
What they found
26,792 unique features; urban sites dominated annotated compounds. LAS surfactants tracked cities; several pesticides (chlorpyrifos, diazinon, malathion) reached Level 1; seven pharmaceuticals previously reported in Bangladesh were detected at all sites.
The limits
What it doesn't show
Feature counts are not concentrations for every chemical, and 12 grab samples cannot give a year-round load or source-apportion every factory.
Key terms
- Nontarget analysis
- HRMS screening without a short pre-set analyte list, to discover unexpected pollutants.
- Suspect screening
- Matching features to a chemical list (mass and fragments) rather than fully unknown de novo ID.
- Level 1 identification
- Confirmation with an authentic standard (Schymanski scale).
- LAS surfactants
- Linear alkylbenzene sulfonates from detergents, here marking urban wastewater.
- ESI vs APCI
- Ionization modes that detect complementary parts of the chemical mixture.
Flashcards
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Unique HRMS features reported:
Common questions
Where were samples taken?
12 sites on four rivers near Dhaka.
How many unique MS features?
26,792 unique features.
Urban vs rural annotations?
Annotated compounds correlated with urban, not rural, sites.
Why Bangladesh?
Dense industry and weak wastewater treatment; few prior nontarget studies.
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