scholarly journals Insights into antimicrobial agent sulfacetamide transformation during chlorination disinfection process in aquaculture water

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14746-14754
Author(s):  
Yaoguang Guo ◽  
Zhiyuan Liu ◽  
Xiaoyi Lou ◽  
Changling Fang ◽  
Pu Wang ◽  
...  
Keyword(s):  
Antimicrobial Agent ◽  
Systematic Study ◽  
Degradation Kinetics ◽  
Transformation Mechanism ◽  
Chlorination Process ◽  
Disinfection Process ◽  
Potential Formation ◽  
Aquaculture Water

A systematic study for degradation kinetics and transformation mechanism of sulfacetamide antibiotic, and the potential formation of H-DBPs represented by HAAs in the chlorination process is explored.

scholarly journals Degradation of clofibric acid in UV/chlorine disinfection process: kinetics, reactive species contribution and pathways

2018 ◽  
Vol 5 (2) ◽  
pp. 171372 ◽  
Author(s):  
Yuqing Tang ◽  
Xueting Shi ◽  
Yongze Liu ◽  
Li Feng ◽  
Liqiu Zhang
Keyword(s):  
Degradation Kinetics ◽  
Clofibric Acid ◽  
Basic Solution ◽  
Uv Photolysis ◽  
Chlorination Process ◽  
Chlorine Disinfection ◽  
First Order Kinetics ◽  
Disinfection Process ◽  
Acidic Conditions ◽  
Degradation Intermediates

As a potential endocrine disruptor, clofibric acid (CA) was investigated in this study for its degradation kinetics and pathways in UV/chlorine process. The results showed that CA in both UV photolysis and UV/chlorine processes could be degraded via pseudo-first-order kinetics, while it almost could not be degraded in the dark chlorination process. The observed rate constant ( k obs ) in UV photolysis was 0.0078 min −1, and increased to 0.0107 min −1 combining with 0.1 mM chlorine. The k obs increased to 0.0447 min −1 with further increasing the chlorine dosage from 0.1 to 1.0 mM, and reached a plateau at higher dosage (greater than 1.0 mM). The higher k obs was obtained at acid solution rather than basic solution. Moreover, the calculated contributions of radical species to k obs indicated that the HO• contributed significantly to CA degradation in acidic conditions, while the reactive chlorine species and UV direct photolysis dominated in neutral and basic solution. The degradation of CA was slightly inhibited in the presence of HC O 3 − (1 ∼ 50 mM), barely affected by the presence of Cl − (1 ∼ 200 mM) and greatly suppressed by humic acid (0 ∼ 5 mg l −1 ). Thirteen main degradation intermediates and three degradation pathways of CA were identified during UV/chlorine process.

Degradation kinetics and pathway of 1H-benzotriazole during UV/chlorination process

2019 ◽  
Vol 359 ◽  
pp. 1502-1508 ◽  
Author(s):  
Jung-Eun Lee ◽  
Moon-Kyung Kim ◽  
Ji-Young Lee ◽  
Young-Min Lee ◽  
Kyung-Duk Zoh
Keyword(s):  
Degradation Kinetics ◽  
Chlorination Process

Quantitative parallel EELS spectrum imaging developed as a new tool in AEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1202-1203
Author(s):  
Gianluigi Botton ◽  
Gilles L'espérance
Keyword(s):  
Statistical Analysis ◽  
Spatial Resolution ◽  
Personal Computer ◽  
Systematic Study ◽  
Present Author ◽  
Chemical Elements ◽  
Detection Limits ◽  
Research Groups ◽  
Quantitative Performance ◽  
Spectrum Imaging

As interest for parallel EELS spectrum imaging grows in laboratories equipped with commercial spectrometers, different approaches were used in recent years by a few research groups in the development of the technique of spectrum imaging as reported in the literature. Either by controlling, with a personal computer both the microsope and the spectrometer or using more powerful workstations interfaced to conventional multichannel analysers with commercially available programs to control the microscope and the spectrometer, spectrum images can now be obtained. Work on the limits of the technique, in terms of the quantitative performance was reported, however, by the present author where a systematic study of artifacts detection limits, statistical errors as a function of desired spatial resolution and range of chemical elements to be studied in a map was carried out The aim of the present paper is to show an application of quantitative parallel EELS spectrum imaging where statistical analysis is performed at each pixel and interpretation is carried out using criteria established from the statistical analysis and variations in composition are analyzed with the help of information retreived from t/γ maps so that artifacts are avoided.

A SYSTEMATIC STUDY OF 2s2 2pk - 2s2pk+l - 2pk+2 TRANSITIONS IN MULTIPLY-CHARGED Cl IONS.

1979 ◽  
Vol 40 (C1) ◽  
pp. C1-208-C1-210 ◽  
Author(s):  
J. P. Forester ◽  
D. J. Pegg ◽  
P. M. Griffin ◽  
G. D. Alton ◽  
S. B. Elston ◽  
...  
Keyword(s):  
Systematic Study ◽  
Multiply Charged
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