Grupo de Estudos Avançados em Química Analítica, Department of Chemistry, Federal University of Paraíba, 58051-970, João Pessoa, PB, Brazil.
Grupo de Estudos Avançados em Química Analítica, Department of Chemistry, Federal University of Paraíba, 58051-970, João Pessoa, PB, Brazil.
Chemosphere. 2021 Mar;267:129154. doi: 10.1016/j.chemosphere.2020.129154. Epub 2020 Dec 7.
Between November 2019 and February 2020, 53 water samples were collected along 430 km of coastline in northeastern Brazil, which was the location of an oil spill that occurred in August 2019. Synchronous fluorescence matrices (SFMs) were acquired to avoid regions affected by Raman Stokes scatterings and second harmonic signals, and then, the SFMs were converted into excitation-emission matrices (EEM) by shear transformation. The matrix coupled with parallel factor analysis (PARAFAC) was used in the study of fluorescent components present in the collected waters. A sample collected before the oil spill and another from Florianópolis-SC, 2000 km from the incident, were used as references for nonimpacted waters. In the postspill samples, 4 components were determined, with component 1 (λ = 225 nm, λ = 475 nm) being associated with humic-like organic matter (terrestrial), component 2 (λ = 230 nm, λ = 390 nm) being associated with humic-like organic matter (marine), component 3 (λ = 225/295 nm, λ = 345 nm) being associated with dibenzothiophene-like components also observed in tests with crude oil samples, and component 4 (λ = 220/280 nm, λ = 340 nm) being associated with a naphthalene-like substance. Principal component analysis (PCA) was performed on the PARAFAC scores. The distribution of samples along the 4 components was observed and compared with the reference samples.
2019 年 11 月至 2020 年 2 月期间，在巴西东北部沿 430 公里海岸线采集了 53 个水样，该地区曾发生过 2019 年 8 月的溢油事件。采集同步荧光矩阵（SFMs）以避免受拉曼斯托克斯散射和二次谐波信号影响的区域，然后通过剪切变换将 SFMs 转换为激发-发射矩阵（EEM）。该矩阵结合平行因子分析（PARAFAC）用于研究采集水样中的荧光成分。使用溢油前采集的样品和距离事件 2000 公里的弗洛里亚诺波利斯-圣卡塔琳娜州的另一个样品作为未受影响水的参考。在溢油后样品中，确定了 4 个组分，组分 1（λ=225nm，λ=475nm）与腐殖质样有机物（陆源）有关，组分 2（λ=230nm，λ=390nm）与腐殖质样有机物（海源）有关，组分 3（λ=225/295nm，λ=345nm）与在原油样品测试中也观察到的二苯并噻吩样成分有关，组分 4（λ=220/280nm，λ=340nm）与萘样物质有关。对 PARAFAC 得分进行主成分分析（PCA）。观察样品沿 4 个组分的分布，并与参考样品进行比较。
