Adsorption Of Chloramphenicol Research Articles

Determination of chloramphenicol at ultra-trace levels by high-performance differential pulse polarography: Application to Milk and Meat

High-performance differential pulse polarography (h.p.d.p.p.) is used to determine the antibiotic chloramphenicol. Optimum operating conditions are discussed. Calibration curves are linear from 10 ng ml -1 to 1 μg ml -1; the detection limit is about 3 ng ml -1. Above 1 μg ml -1, deviations from linearity occur, because of adsorption of chloramphenicol at the mercury electrode. A correction, based on variations in natural drop time, is suggested. Chloramphenicol is readily extracted from milk or minced meat with diethyl ether. The ether is evaporated, and the residue is taken up in acetate buffer pH 4.7 and filtered through a membrane filter. Recoveries from samples fortified at levels of 10–1000 ng ml -1 are about 60% for milk and 50% for minced meat.

Steel for columns

This study described the adsorption of chloramphenicol (CAP) in wastewater on the renewable bioresource of bamboo charcoal (BC). Results showed that CAP adsorption on BC (Ln qe = 1.272 Ln Ce + 1.971) and H2SO4 modified BC (Ln qe = 1.851 Ln Ce + 0.659) were very slight, and on NaOH modified BC was significantly increased (Ln qe = 0.344 Ln Ce + 6.490). The adsorbents were characterized by N2 adsorption–desorption, X-ray diffraction (XRD), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). It is revealed that BC and modified BC had very small surface areas of less than 1 m2 g−1, H2SO4 treatment led to minimal variation in surface functional groups, and NaOH treatment increased the percentage of surface graphitic carbon and other oxygen-containing groups. The increased adsorption of CAP on NaOH modified BC was mainly ascribed to the enhancement of the π–π interaction between the adsorbent and adsorbate.