Volatile compounds released by microalgae-water phase from Taihu Lake in China.

• Dynamic headspace sampling with on-line monitoring of CH 4 and NMHC reflects quasi-realtime release behavior of volatile compounds. • Profiles of VOCs and their released rates described by NMHC were closely related to microalgae's state of health or the life stages. • NMHC and methane were estimated from 0.02 to 0.59 μgC/(h g) and 0.05–3.96 μgC/(h g), respectively. The spectrum of Volatile Organic Compounds (VOCs) released by the microalgae-water phase of Taihu Lake in China was examined, then release behaviors were studied using non-methane hydrocarbons (NMHC, including a few polar organics) to describe the total amount of the released VOCs. Coupled dynamic headspace sampling with on-line monitoring of methane and NMHC was used to reflect the quasi-realtime release behavior of methane and NMHC by the microalgae-water phase. Alkanes, alkenes, oxygenated VOCs (OVOCs) and volatile sulfide chemicals (VOSCs) were detected. Their relative contents over time varied markedly from the stationary to the apoptosis phase, with their release rates as described by NMHC estimated from 0.02 to 0.59 μgC/(h g). Methane was investigated simultaneously, and its release rate was found to be 0.05–3.96 μgC/(h g). The release rates of both NMHC and methane were found to relate to the culture phase of the microalgae. [ABSTRACT FROM AUTHOR]