Results 291 to 300 of about 81,916 (310)

Ozonation degradation of microcystin-LR in aqueous solution: Intermediates, byproducts and pathways

Water Research, 2014
The intermediates and byproducts formed during the ozonation of microcystin-LR (MC-LR, m/z = 995.5) and the probable degradation pathway were investigated at different initial molar ratios of ozone to MC-LR ([O3]0/[MC-LR]0). Seven reaction intermediates with m/z ≥ 795.4 were observed by LC/MS, and four of them (m/z = 815.4, 827.3, 853.3 and 855.3) have
Zhe Wang, Xiao-wei Liu, Lei Yang, Chang-xin Nie, Jimin Shen, Zhonglin Chen, Jing Kang, Qian Chen, Jing Chang   +8 more
openaire   +3 more sources

Sonochemical degradation of diclofenac: byproduct assessment, reaction mechanisms and environmental considerations

Environmental Science and Pollution Research, 2014
The study covers a thorough assessment of the overall degradation of diclofenac-Na (DCF) by high-frequency ultrasound, focusing particularly on identification, interpretation, and characterization of the oxidation byproducts and their reaction mechanisms.
Nilsun H. Ince, Asu Ziylan, Viktorya Aviyente, Rana Kidak, Sesil Agopcan, Şifa Doğan   +5 more
openaire   +3 more sources

SrSnO3/g-C3N4 and sunlight: Photocatalytic activity and toxicity of degradation byproducts

Journal of Environmental Chemical Engineering, 2020
Abstract The presence of organic pollutants in the environment, especially in water, is recognized as a continuing threat to environmental stability. Therefore, the development of new materials for the removal of organic pollutants in water are of fundamental importance.
Idio Alves de Sousa Filho, Laura Ruiz Arana, Giscard Doungmo, Cesar Koppe Grisolia, Huayna Terrashke, Ingrid Távora Weber   +5 more
openaire   +2 more sources

Kinetics and Mechanism of the Sonolytic Degradation of CCl₄:  Intermediates and Byproducts

Environmental Science & Technology, 1996
The sonolytic degradation of aqueous carbon tetrachloride is investigated at a sound frequency of 20 kHz and 135 W (112.5 W cm^(-2)) of power. The observed first-order degradation rate constant in an Ar-saturated solution is 3.3 × 10^(-3) s^(-1) when the initial CCl_4 concentration, [CCl_4]_i, is 1.95 × 10^(-4) mol L^(-1) and increases slightly to 3.9 ×
Hua, Inez, Hoffmann, Michael R.
openaire   +3 more sources

Tetracycline degradation by ozonation, and evaluation of biodegradability and toxicity of ozonation byproducts

Journal of Environmental Engineering and Science, 2013
Tetracycline was exposed to ozone by bubbling at different pH levels, and the acute toxicity of ozonation byproducts was tested by luminescent bacteria (Vibrio qinghaiensis sp.-Q67). Residual tetracycline in the solutions was detected by high performance liquid chromatography (HPLC).
Yun-Xia Jiang, Longying Zha, Jufeng Ye, Zhifeng Zhou, Zhuoming Ye, Jiguo Wu, Hongwei Zhou   +6 more
openaire   +2 more sources

Degradation of Halogenated Disinfection Byproducts in Water Distribution Systems

2008
Water distribution systems are complex environments frequently containing corroded iron pipes and biofilms. To thoroughly understand the fate of halogenated disinfection byproducts (DBPs) in these systems, two degradation processes were investigated: abiotic degradation (i.e. hydrolysis and reductive dehalogenation) and biodegradation.
Ping Zhang, Jeong Yub Lee, Bill Arnold, Timothy M. LaPara, Carrie R. Pearson, Raymond M. Hozalski, Chan Lan Chun   +6 more
openaire   +2 more sources

Variation in ruminal degradation and intestinal digestion of animal byproduct proteins

Animal Feed Science and Technology, 1996
Abstract In situ and in vitro procedures were used to determine ruminal degradation and intestinal digestion of crude protein (CP) from animal byproducts. Seven samples of meat and bone meal (MBM), hydrolyzed feather meal (HFM), ring dried blood meal (RBM), and batch dried blood meal (BBM) were obtained from various rendering and meat packing plants.
Marshall D. Stern, Sergio Calsamiglia, S.A. Howie   +2 more
openaire   +2 more sources

Reaction of Sevoflurane and Its Degradation Products with Soda Lime

Anesthesiology, 1992
Sevoflurane previously has been reported to undergo extensive degradation in the presence of soda lime. To more completely characterize the extent and significnce of this reaction, we studied degradation of sevoflurane with and without soda lime, as well as the toxicity and mutagenicity of the degradation products.
Urao Kawakami, Masahiro Imai, Yoichiro Kawai, Takahiro Mizuno, Nobukatsu Satoh, Kohyu Fujii, Takashi Tamura, Toshikazu Kawai, Michio Morio, Yasumasa Ogasawara, Yoichi Kumagai, Akira Negishi   +11 more
openaire   +3 more sources

A metabolic model for thiodiglycol degradation: capacity constraint leads to byproduct accumulation

Bioprocess and Biosystems Engineering, 2001
A metabolic model was developed to describe the degradation of thiodiglycol (TDG) by Alcaligenes xylosoxydans ssp. xylosoxydans (SH91). Experimental evidence has suggested there is a metabolic capacity constraint that limits the specific thiodiglycol utilization rate, leads to metabolic byproducts, and ultimately inhibits the overall degradation ...
S.-H. Chan, Tsu-shun Lee, William A. Weigand, William E. Bentley   +3 more
openaire   +2 more sources

Chlorination of enoxacin (ENO) in the drinking water distribution system: Degradation, byproducts, and toxicity

Science of The Total Environment, 2019
Chlorine is widely used as a drinking water disinfectant to ensure water security. However, the transformation mechanisms of its degradation of emerging pollutants within the water distribution system (WDS) is insufficiently understood. Thus, the kinetics, degradation byproducts, and toxicity of the chlorination of enoxacin (ENO, a type of emerging ...
Tuqiao Zhang, Qingzhou Zhang, Guilin He, Yuan Huang, Feilong Dong   +4 more
openaire   +2 more sources