Dissolved black carbon review: how tiny carbon particles affect pollutant transport and carbon cycling

A new review published in Biochar examines how dissolved black carbon (DBC) behaves in water, showing it does not simply dissolve and disappear. Instead, DBC acts as a colloidal material that can either stay suspended, aggregate, or settle into sediments. This behavior controls whether carbon and attached pollutants like heavy metals and antibiotics travel long distances or get trapped locally. The review explains that DBC stability depends on its molecular structure, source materials, and environmental factors like pH and calcium levels. These findings matter for biochar use in soil remediation, water quality management, and refining estimates of land-to-ocean black carbon flux. The authors call for better models that account for DBC aggregation in real-world waters.