This paper introduces a new reagent N-phenylbenzylamine for determination of nitrite in water and aqueous solutions. The reagent in the acidic medium coupled with diazotized dapsone to form the azo dye. The reaction provides a sensitive and reproducible determination of nitrite without special modifications of reaction conditions. The detection limit is 0.07 μg.ml, and linear range 0.1-2.0 μg.m...

The efficacy of a miniaturized unimolecular analytic system is illustrated. The easily accessible therapeutic chromophore "temoporfin", which responds differentially to bound metals at multiple wavelengths of Q-band absorption using chemometric analysis, expeditiously detects and discriminates a wide range of metals regarded as priority pollutants in water and hence may also be used for diagnos...

Water pollution can be found in the oceans, seas, rivers and lakes which taken as organic pollutants or better known emerging pollutants. Emerging (EP´s) are chemical substances that persist environment, these molecules food chain causing risks adverse effects for human health environment. EP´s not they discharged effluents indiscriminately, this reason is important to improve water treatment b...

Dioxins are a group of anthropogenic chemical compounds created as unintended by-products through a number of activities including: combustion, certain types of chemical manufacture, chlorine bleaching of pulp and paper, and other industrial processes. Dioxins are produced in very small quantities compared to other pollutants; however, because this family of compounds are thought to be highly t...

The rapid economic development in The Pearl River delta region (PRDR) has exerted serious potential pollution threats to areas in the vicinity, which have complicated the task of environmental protection in Hong Kong and Macau. In this paper, a three-dimensional numerical pollutant transport model coupled with a synchronised numerical hydrodynamic model, is developed and employed to simulate th...

We present a physically-based animation method for simulating the diffusion of water pollutant in this paper. Our method allows animating the dynamic evolution of biological pollutants (e.g., water hyacinth, algae) on largescale water surface effectively. To enable the simulation of such a phenomenon in large scale virtual environment, we simplify the problem by considering the water pollutants...

The contamination of water resources with many organic xenobiotic compounds poses a challenge to environmental sciences and technologies [1]. Although in many cases these contaminants are present only in small concentrations, the large variety of such compounds (some of which are classified as priority pollutants) is a matter of concern. Adsorption, alone or as part of a more complex water or w...

there are 3700 wells in tehran city, of which 850 are deep wells. to determine tehran ground water quality, as a pretest we selected 102 wells by simple random sampling; water analyses were made according to the latest edition (1985) of the standard methods. comparisons of the obtained results with who standards show that only 0.98% of the samples go beyond the maximum desirable concentration o...

Water quality assessment at the watershed scale requires not only an investigation of water pollution and the recognition of main pollution factors, but also the identification of polluted risky regions resulted in polluted surrounding river sections. To realize this objective, we collected water samplings from 67 sampling sites in the Honghe River watershed of China with Grid GIS method to ana...