This study is a simple method for rapid sample preparation before instrumental experiment, which is an important tool and the main step in an analytical proceeding. Till now, different sample preparation procedures based on solid-phase extraction manner were developed to isolate different types of analytes from different matrices. In this method, the preconcentration and removal of trace amounts of Hg (II) ion in aqueous samples with nanotubes functionalized carboxyl are displayed. The analysis of Hg 2+ ions concentration in water solutions was accomplished by flame atomic absorption spectroscopy. Some parameters including the pH, value, and type of desorption eluent solvent, extraction time, ions effect etc. were optimized. The Freundlich, Langmuir, Temkin, and Dubinin-Radushkevich models were employed to estimate Hg (II) ions adsorption. The Freundlich model was obtained from the study of isotherm studies. The kinetic studies demonstrate the adsorption of Hg (II) ions by adsorbent fitted with the pseudo-second-order type and resulting from that chemisorption is the rate-limiting process in the Hg (II) adsorption. The concentration parameter such as level of detection of proposed method, and relative standard deviation test were obtained as 20.83, 6 µg L −1 , and 1.16%, respectively.

In recent years, drug use is on the rise, causing environmental pollution. Therefore, drug control is a common practice in many laboratories. This project focuses on increasing the method for determining small amounts of norfloxacin in aqueous and biological samples. Solid-phase extraction of small amounts of norfloxacin in aqueous samples using 2-aminopyridine/graphene oxide nano-plates and visible and ultraviolet spectrophotometric measurements are used in biological samples. These systems include two phases, the aqueous donor phase and the acceptor phase of conjugated carbon nanomaterial. Aqueous phase extraction and norfloxacin adsorption were performed in two experimental steps. First, methanol acidic solvent was used and the adsorbed samples were submitted to Vis-UV spectrophotometry for further analysis. Extraction parameters in this method This cheap and simple method is compatible with most tool analysis methods. These parameters include extraction time, adsorption of organic solvent effect, adsorption time, shaking time, the volume of donor phases, and optimized surfactant effect, and analysis and measurement were performed under optimal conditions.