Quantitative Collection Of Nitrophenol Compounds In Aquatic Environment By Thin Film Diffusion Gradient Technology

The nitrophenol compound is a prototype toxic substance that has a toxic effect on all living individuals,and has been listed as a priority monitoring pollutant by the United States and other countries.With the development of modern industry and the increase of wastewater discharge,nitrophenol wastewater has attracted more and more attention to human harm.Activated carbon adsorption technology is one of the most widely used treatment methods for sewage and drinking water.In this paper,the adsorption kinetics of activated carbon on 2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol in water were studied.The adsorption capacity of activated carbon on2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol was 1.08mg?disc^-1,0.89mg?disc^-1,0.87mg?disc^-1respectively.The optimum desorption concentration of sodium hydroxide was 0.1 mol?L^-1.DGT technique is a new in site passive sampling technique.It can be used to collect organic matter and inorganic matter in solution,soil and sediment.In this paper,the effective content of 2-nitrophenol,p-nitrophenol,2,4-dinitrophenol in aqueous solution was quantitatively collected using nylon film as diffusion phase of DGT device and activated carbon as binding phase.Firstly,the influence of pH and ionic strength on the diffusion coefficient was investigated in this paper.The results show that the ionic strength has no significant effect on the diffusion coefficient of nitrophenol in the nylon membrane.Secondly,the effectiveness of the DGT device was studied.The experimental results showed that the cumulative amount of 2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol increased linearly with the increase of the standing time.The measurement of 2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol in aqueous solution by DGT is in accordance with the evaluation criteria for the combined phase of DGT technology.The effects of pH,ionic strength and fulvic acid on the effectiveness of DGT were also investigated.The experimental results show that C_DGT/C_SOLN are in the range of 0.9¹.1,indicating that pH,ionic strength and ionic strength have no significant effect on the measurement of DGT device effectiveness.The pH range of DGT for2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol is 3⁸;the range of pNaNO₃ is 0.155².3.The DGT device is not only suitable for the measurement of the concentration of 2-nitrophenol,p-nitrophenol and2,4-dinitrophenol in fresh water,but also for 2-nitrophenol,p-nitrophenol and 2,4-di in seawater.Finally,when the DGT devices are placed in the Xihe river and the Hunhe river respectively,The results show that C_DGT/C_SOLN are in the range of 0.9¹.1,and the DGT device can be used to accumulate and measure2-nitrophenol,p-nitrophenol and 2,4-dinitrophenol in the above water environment.