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Biotransformation in water and soil of nitrosamines and nitramines potentially generated from amine-based CO2 capture technology
International Journal of Greenhouse Gas Control ( IF 3.9 ) Pub Date : 2018-02-20 , DOI: 10.1016/j.ijggc.2018.01.021
Odd G. Brakstad , Lisbet Sørensen , Kolbjørn Zahlsen , Kristin Bonaunet , Astrid Hyldbakk , Andy M. Booth

Nitrosamines (NSAs) and nitramines (NAs) are identified as possible degradation products from amine-based post-combustion CO2-capture (PCCC). Selected NSAs and NAs were subjected to aerobic and anaerobic biodegradation studies. In a screening study with 20 μg/L NSAs and NAs at 20 °C, only NSAs and NAs containing hydroxyl groups (alkanol compounds) exhibited aerobic biotransformation >10% after incubation in 28 days. Extending the biodegradation period to 56 days resulted in ≥80% biotransformation of the examined alkanol NSAs and NAs at 20 °C. Biotransformation (20 °C; 56 days) of the NSA NDELA at different concentrations (1–100 μg/L) did not differ significantly, but both water sources and temperatures affected biotransformation of the tested compounds. Anaerobic biotransformation (20 °C; 56 days) occurred rapidly with alkanol NSAs and NAs, but not with alkyl compounds. Interestingly, 1st order rate coefficients and half-lives indicated comparable or even faster anaerobic than aerobic biotransformation at the same temperature. Predictions of biotransformation pathways suggested that the -OH substituent of alkanol NSAs and NAs was more susceptible to degradation than nitroso- and nitro-substituents.



中文翻译:

胺基CO 2捕集技术潜在产生的亚硝胺和硝胺在水和土壤中的生物转化

亚胺(NSA)和亚硝胺(NAs)被确定为胺基燃烧后CO 2的可能降解产物捕获(PCCC)。对选定的NSA和NA进行需氧和厌氧生物降解研究。在20°g / L的NSA和NAs于20°C进行的筛选研究中,孵育28天后,只有含有羟基(链烷醇化合物)的NSA和NAs表现出好氧生物转化率> 10%。将生物降解期延长至56天会导致所检测的链烷醇NSA和NA在20°C时具有≥80%的生物转化率。NSA NDELA在不同浓度(1–100μg/ L)下的生物转化(20°C; 56天)没有显着差异,但是水源和温度都影响测试化合物的生物转化。链烷醇NSA和NAs快速发生厌氧生物转化(20°C; 56天),而烷基化合物则没有。有趣的是,一阶速率系数和半衰期表明,在相同温度下,厌氧比有氧生物转化具有可比性甚至更快。生物转化途径的预测表明,链烷醇NSA和NAs的-OH取代基比亚硝基和硝基取代基更易于降解。

更新日期:2018-02-20
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