Natural soil bacteria compound weakens biochar's pesticide-trapping power
Wang S, Wang B, Wen K, Ma Y, Farooq U
Soil Health
If you use biochar to improve garden soil or filter runoff, naturally occurring soil microbes can produce compounds that quietly undo its ability to lock away pesticide residues.
Biochar is basically charcoal made for soil improvement, and scientists love it because it soaks up pesticides like a sponge, keeping them out of groundwater. But this study found that rhamnolipid, a soapy substance made by common soil bacteria, clogs up biochar's pores and competes for the same binding spots, cutting its pesticide-trapping power by more than half in some cases. The effect was strongest in acidic soil and weakest in alkaline soil, meaning biochar's real-world performance depends a lot on what else is living and growing around it.
Key Findings
Biochar made at higher temperature (750°C) trapped both neonicotinoid pesticides far better than biochar made at lower temperature (300°C).
Rhamnolipid cut the maximum pesticide-holding capacity of low-temperature biochar for nitenpyram from 7.3 mg/g down to 2.8 mg/g at just 30 mg/L concentration.
The inhibitory effect of rhamnolipid weakened as soil pH rose from 3.0 to 10.0, and it disrupted nitenpyram binding more than dinotefuran binding.
chevron_right Technical Summary
Biochar, a soil additive made from burned organic material, is good at trapping pesticides before they contaminate water, but a common natural soap-like compound called rhamnolipid blocks this ability significantly, sometimes cutting pesticide capture by more than half.
Abstract Preview
Original paper
Insight into the inhibitory role of rhamnolipid in the adsorption of neonicotinoid pesticides onto biochars.
Biochar, an economical porous carbonaceous material, exhibits considerable potential for diverse applications, particularly in soil remediation and wastewater treatment. Rhamnolipid-a ubiquitous bi...
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