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1

Effect of Mn(II) on tetracycline degradation by a selected strain Burkholderia sp.

Jiao Chaoxing, Xiong Hongbin, Zhou Benjun

Ecological Chemistry and Engineering. S

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2023

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Vol. 30, nr 3

417--427

EN

Removal of residual tetracycline (TC) in the environment is an important issue for pollution control. In this study, a TC-degrading strain named JX_1 was isolated from the soil around an industrial park, the strain was identified as Burkholderia sp. by 16s rDNA sequencing analysis. The effects of various factors on TC degradation by the strain were studied, results indicated that the inoculation amounts and liquid volume had little effect on TC degradation rate. However, the degradation rate of TC by strain increased with the increase of pH, and the residual concentration increased gradually with the initial TC concentration increased. The degradation rate of 125 mg/L TC by strain JX_1 was 75.76 % under the conditions of temperature 37 °C, 2 mL inoculation amount and 200 mL liquid volume. Under the same conditions, the degradation rate of TC was increased to 91.39 % with the addition of 0.75 g/L MnSO4, indicating that Mn(II) could improve the degradation rate of TC by strain JX_1 to a certain extent.

2

Tetracycline removal from water by adsorption on geomaterial, activated carbon and clay adsorbents

Ait-Hamoudi Souhila, Hamdi Boualem, Brendlé Jocelyne

Ecological Chemistry and Engineering. S

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2021

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Vol. 28, nr 3

303--328

EN

The use of antibiotics for breeding and for humans increased considerably in recent years, as a dietary supplement to enhance animal growth. This frequent use leads to the detection of residues in water and wastewater. Thus, the emergence of new strains of bacteria resistant to these antibiotics and, can lead to incurable diseases of livestock, and can lead to a possible transmission of these strains to humans. The purpose of this work is to develop new materials based on treated Maghnia clay, activated carbon, cement, and PVA polymer, named geomaterials. These materials were intended for the containment of hazardous wastes in landfills. The removal of tetracycline from aqueous solution was tested by adsorption onto synthesised geomaterials and their mineral constituents. Adsorption kinetics revealed that tetracycline was rapidly retained by GM and ATMa. This was confirmed by the relatively short equilibrium time of 30 min. The pseudo-second-order and intraparticle models well fitted the adsorption kinetic of the TC-adsorbent studied systems. It was noticed that the adsorption kinetic passes through several mechanisms, was demonstrated by the multi-linearity on the plot of qt against the square root of t. The adsorption capacity (Qa) of TC onto GM is pH-dependent. Indeed, Qa reaches a maximum value (Qa = 12.58 mg · g–1 at a very acidic pH of 2, then the adsorbed amount decreases to reach a minimum value at pH of 8, and for basic pHsQa increases up to 10 mg · g–1.

3

Determination of tetracycline, oxytetracycline and chlortetracycline in milk by TLC and column chromatography using Amberlite XAD-2

Petkovska E., Slaveska-Raicki R., Rafajlovska V.

Chemia Analityczna

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2006

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Vol. 51, No. 2

275-283

EN

In solid biological samples selected cations and anions have been determined by ion chro-matography (1C). Before the analysis, single preparation step has been applied. The proposed procedure allowed one to determine concentration of alkali and alkaline cations (Na+, K+, Mg2+, Ca2+), as well as anions (Cl-, Br-

PL

Zaproponowano procedure przygotowania stałych próbek biologicznych umożliwiającą oznaczanie kationów (Na+, K+ Mg2+, Ca2+) i anionów (Cl-, Br-) w tym samym roztworze metodą wysokosprawnej chromatografii jonowej z detekcjąkonduktomctryczną. Pomiary wykonano używając dwóch kolumn chromatograficznych (z fazami stacjonarnymi zawierającymi grupy sulfonową) trimetyloaminową) oraz trzech eluentów w trybie elucji izokratycznej. Walidację metody przeprowadzono za pomocą analizy certyfikowanego materiału odniesienia (cotton cellulose, IAEA V-9). Metodę zastosowano do analizy próbek różnych gatunków drewna.

4

Synthesis, characterization and analytical applications of new chelating resin containing tetracycline

Singh D. K., Srivastava M.

Chemia Analityczna

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2005

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Vol. 50, No. 2

377-386

EN

A new chelating resin based on phenol-formaldehyde copolymer containing tetracycline as functional species has been synthesized. The mixture of 0.1 mol of phenol, 0.2 mol of formaldehyde and 10.4 inmol of tetracycline provided the highest sorption capacity of the phenol-formaldehydc-tetracyclme system (PFTC3). Complexation properties (distribution coefficients) of PFTC3 chelating resin towards 17 metal ions has been studied in demineralized water (DMW) and 0.1 mol L-1 NaNO3 as well as buffer solutions at different pH (2-6). A tentative structure of PFTC3 was proposed and confirmed by FTIR analysis and the estimated tetracycline content. Successive separations of some pairs of metal ions have been performed. The new chelating resin has also been applied to the selectiveremoval of Fe+3 and Zr4+ from dilute aqueous solutions.

PL

Zsyntetyzowano na bazie polimeru fenolowo-formaldehydowego nowy jonit chelalujący zawierający tetracyklinę jako grupę funkcyjną. Najwyższą zdolność sorpcyjną ukiadu fenolowo-formaldchydowo-tetracyklinowego (PFTC3) uzyskano wychodząc z mieszaniny 0.1 mola fenolu, 0.2 mola formaldehydu i 10.4 mmola tetracyldiny. Zbadano zdolność komplcksowania (współczynniki podziaiu) 17-u jonów metalicznych na jonicie PFTC3 w wodzie demineralizowanej (DMW) i 0.1 mol L-1 NaNO3 oraz w roztworach buforów (pH = 2-6). Zaproponowano wstępnie strukturę PFTC3, którą potwierdziła analiza za pomocą FTIR oraz oszacowano zawartość tetracykliny w jonicie. Wykonano udane rozdzielenia par jonów metalicznych. Nowy jonit chelatujący zastosowano także do selektywnego usuwania Fe+3 i Zr4+ z rozcieńczonych roztworów wodnych.