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Tolerance and sorption of Bromacil and Paraquat by thermophilic cyanobacteria Leptolyngbya 7M from Costa Rican thermal springs.
Journal of Contaminant Hydrology ( IF 3.6 ) Pub Date : 2019-08-03 , DOI: 10.1016/j.jconhyd.2019.103539
Laura Brenes-Guillén 1 , Paola Fuentes-Schweizer 2 , Alfonso García-Piñeres 3 , Lorena Uribe-Lorío 1
Affiliation  

We studied the adsorption ability and tolerance of the thermophilic filamentous cyanobacteria Letolyngbya 7M towards Paraquat and Bromacil. Adsorption isotherms at pH = 7.0 showed an adsorption capacity of 24.4 mg/g and 66.8 mg/g, respectively, and a good fit to the Langmuir model (R2 = 0.97 and 0.99, respectively). To evaluate the effect of both herbicides on photosynthetic pigments and viability of cyanobacteria, cell autoflorescence and esterase activity was determined using flow cytometry. Autofluorescence was less sensitive to changes in cell viability, as it was only slightly reduced at high Paraquat and Bromacil concentrations. Herbicide effect on esterase activity is dose-dependent. Bromacil did not cause a significant effect on either chlorophyll a content or cell viability. This study demonstrates the potential of Leptolyngbya 7M to remove Paraquat and Bromacil herbicides from aqueous solution under laboratory conditions.



中文翻译:

哥斯达黎加温泉的嗜热蓝细菌Leptolyngbya 7M对溴苯虫和百草枯的耐受性和吸附性。

我们研究了嗜热丝状蓝细菌Letolyngbya 7M对百草枯和Bromacil的吸附能力和耐受性。pH = 7.0时的吸附等温线分别显示出24.4 mg / g和66.8 mg / g的吸附容量,与Langmuir模型具有很好的拟合度(R 2 分别为0.97和0.99)。为了评估两种除草剂对光合色素和蓝细菌生存力的影响,使用流式细胞仪测定了细胞的自花序和酯酶活性。自体荧光对细胞活力的变化不太敏感,因为在百草枯和溴马西定的高浓度下它仅会稍微降低。除草剂对酯酶活性的作用是剂量依赖性的。Bromacil对任何一种叶绿素a均无明显影响含量或细胞活力。这项研究表明,在实验室条件下,Leptolyngbya 7M可以从水溶液中去除百草枯和溴苯甲烷除草剂。

更新日期:2019-08-03
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