Polycyclic Aromatic Hydrocarbons in the Surface Microlayer of Lake Baikal during Wildfires and Naphthalene-degrading Strains from the Bacterioneuston

Galachyants, A. D.; Suslova, M. Yu.; Marinayte, I. I.; Izosimova, Oksana N.; Krasnopeev, Andrey; Shtykova, Yu. R.; Тихонова, И. В.; Podlesnaya, G. V.; Белых, О. И.

doi:10.1134/s0026261720050082

Cited by 4 publications

(3 citation statements)

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“…The aliquot and the combined extract were dried over sodium sulfate; the extract was concentrated on a rotary evaporator up to a volume of ≈1 mL and then in argon flux up to a volume of ≈0.1 mL. Samples of the surface microlayer and water samples collected in the Arctic area were analyzed using the technique given in [45], which differed in the extraction of PAHs from 100 mL of water with 1 mL of n-hexane and GC-MS/MS analysis of the extracts without their concentration [46]. The detection of PAHs in water samples collected in the Arctic area included the extraction of PAHs on board the research vessel followed by the determination of analytes in the extract in the laboratory at Limnological Institute SB RAS.…”

Section: Methodsmentioning

confidence: 99%

“…PAH and PCB peaks were recorded using the MRM mode [46,47]. The limits of determination (LOD) of PAHs and PCB in the water were estimated at 1.0-01 ng/L and 0.01-0.02 ng/L [45,46]; on filters with an aerosol, they were 2.0 and 0.02 pg/m 3 , respectively. The LOD method was assessed based on the peak-to-peak signal to noise response of each of the PAH and PCB peaks and at the lowest standard concentration.…”

Section: Methodsmentioning

confidence: 99%

“…PAHs entering the neuston of the water surface undergo biodegradation. Model experiments have indicated that communities of Baikal microorganisms effectively biodegrade naphthalenes (up to 95-97%) within five days [45]. Moreover, the Synedra acus subsp.…”

Section: Toxicity and Risk Assessmentmentioning

confidence: 99%

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Wildfires as a Source of PAHs in Surface Waters of Background Areas (Lake Baikal, Russia)

Горшков

Izosimova

Kustova

et al. 2021

Water

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Polycyclic aromatic hydrocarbons (PAHs) were detected in different types of PAH-containing samples collected in Lake Baikal during wildfires in the adjacent areas. The set of studied samples included the following: (i) water from the upper layer (5 m); (ii) water from the surface microlayer; (iii) water from the lake tributaries; (iv) water from deep layers (400 m); and (v) aerosol from the near-water layer. Ten PAHs were detected in the water samples: naphthalene, 1-methylnaphthalene, 2-methylnaphthalene acenaphthylene, acenaphthene, fluorene, phenanthrene, fluoranthene, pyrene, and chrysene. The total PAH concentrations (ƩPAHs) were detected in a wide range from 9.3 to 160 ng/L, characterizing by seasonal, intersessional, and spatial variability. In September 2016, the ƩPAH concentration in the southern basin of the lake reached 610 ng/L in the upper water layer due to an increase in fluorene, phenanthrene, fluoranthene, and pyrene in the composition of the PAHs. In June 2019, ƩPAHs in the water from the northern basin of the lake reached 290 ng/L, with the naphthalene and phenanthrene concentrations up to 170 ng/L and 92 ng/L, respectively. The calculation of back trajectories of the atmospheric transport near Lake Baikal, satellite images, and ƩPAH concentrations in the surface water microlayer of 150 to 960 ng/L confirm the impact of wildfires on Lake Baikal, with which the seasonal increase in the ƩPAH concentrations was associated in 2016 and 2019. The toxicity of PAHs detected in the water of the lake in extreme situations was characterized by the total value of the toxic equivalent for PAHs ranging from 0.17 to 0.22 ng/L, and a possible ecological risk of the impact on biota was assessed as moderate.

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Section: Methodsmentioning

confidence: 99%