+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Photodegradation and toxicity changes of antibiotics in UV and UV/H(2)O(2) process

, : Photodegradation and toxicity changes of antibiotics in UV and UV/H(2)O(2) process. Journal of Hazardous Materials 185(2-3): 1256-1263

The photodegradation of three antibiotics, oxytetracycline (OTC), doxycycline (DTC), and ciprofloxacin (CIP) in UV and UV/H(2)O(2) process was investigated with a low-pressure UV lamp system. Experiments were performed in buffered ultrapure water (UW), local surface water (SW), and treated water from local municipal drinking water treatment plant (DW) and wastewater treatment plant (WW). The efficiency of UV/H(2)O(2) process was affected by water quality. For all of the three selected antibiotics, the fastest degradation was observed in DW, and the slowest degradation occurred in WW. This phenomenon can be explained by R(OH,UV), defined as the experimentally determined OH radical exposure per UV fluence. The R(OH,UV) values represent the background OH radical scavenging in water matrix, obtained by the degradation of para-chlorobenzoic acid (pCBA), a probe compound. In natural water, the indirect degradation of CIP did not significantly increase with the addition of H(2)O(2) due to its effective degradation by UV direct photolysis. Moreover, the formation of several photoproducts and oxidation products of antibiotics in UV/H(2)O(2) process was identified using GC-MS. Toxicity assessed by Vibrio fischer (V. fischer), was increased in UV photolysis, for the photoproducts still preserving the characteristic structure of the parent compounds. While in UV/H(2)O(2) process, toxicity increased first, and then decreased; nontoxic products were formed by the oxidation of OH radical. In this process, detoxification was much easier than mineralization for the tested antibiotics, and the optimal time for the degradation of pollutants in UV/H(2)O(2) process would be determined by parent compound degradation and toxicity changes.


PMID: 21074943

DOI: 10.1016/j.jhazmat.2010.10.040

Other references

Krantz E.M.; Viljoen J.F., 1979: Hemoptysis following insertion of a swan ganz catheter. Hemoptysis occurred in a patient in whom a Swan-Ganz catheter was inserted for the induction of anesthesia for hemicolectomy. Apparently acute pulmonary hypertension, superimposed on existing chronic pulmonary hypertension associated with mitral s...

Bodagh, I.Y.; Robertson, D.R., 1994: A risk-benefit assessment of drugs used in the management of Parkinson's disease. The introduction of levodopa therapy in the 1960s and subsequent advances in neuropharmacology have revolutionised the management of Parkinson's disease but at a cost. Adverse effects are common, and an erratic pattern of response may develop...

Rodríguez-Gómez, J.; León, R.; Robles, J.Carlos.; de la Torre-Cisneros, Ján., 2016: Adult pneumoccocical sepsis: Should we rule out congenital anesplenia?. Enfermedades Infecciosas Y Microbiologia Clinica 34(9): 607-608

Thompson, W.H., 1900: Diuretic effects of sodium chloride solutions: an inquiry into the relation which certain factors bear to renal activity. Journal of Physiology 25(6): 487-518

Beghi, E.; Beghi, M.; Cornaggia, C., 2005: Primary prevention of epilepsy in patients with different epileptogenic conditions. Epileptic seizures are a common complication of several clinical conditions affecting the CNS. In these cases, the occurrence of seizures and epilepsy may increase the functional damage provoked by the underlying epileptogenic condition and affect...

Nightingale, J., 2017: Review of Radiography in 2016 (Volume 22). Radiography 23(1): 1-2

Ringaitienė, D.; Gineitytė, D.; Vicka, V.; Žvirblis, T.; Šipylaitė, Jūratė.; Irnius, A.; Ivaškevičius, J., 2016: Preoperative risk factors of malnutrition for cardiac surgery patients. Malnutrition (MN) is prevalent in cardiac surgery, but there are no specific preoperative risk factors of MN. The aim of this study is to assess the clinically relevant risk factors of MN for cardiac surgery patients. The nutritional state of the...

Galler, J.R.; Waber, D.; Harrison, R.; Ramsey, F., 2005: Behavioral effects of childhood malnutrition. One third of adult women in the United States are obese. During pregnancy, obese women are at increased risk for several adverse perinatal outcomes, including anesthetic, perioperative, and other maternal and fetal complications. Obstetricians sho...

Albright, J.D., 1969: Aeromedical evaluation--a philosophy. Military Medicine 134(9): 703-704

Bisceglia, L.; D.P.rna, M., 2007: Gene symbol: SLC3A1. Human Genetics 121(2): 293-293