| With the acceleration of industrialization process, the demand of the aluminium industry has increased gradually. The environmental protection equipment has not developed and completed in China. At the same time, a lot of aluminium factory pollutants regulatltion loopholes still exist, causing the environmental pollution accidents occur frequently. So it is necessary to provide a theoretical basis for the pollutants emergency from industry which have potential environmental pollutants. With aluminum as the research object, this paper studies the determination method of aluminum and adsorption-desorption characteristics of aluminum and its influencing factors in Planosol soil. Results showed that,(1) Used microwave plasma atomic emission spectrometry(MP-AES) to determine aluminum content in in aqueous solution and soil. Results show that 396.152 nm emission line as analytical spectral lines to determine aluminium content using peristaltic pump. And setting the best atomizer pressure of 240 kpa detected aluminium content at 10 mm. The linear range of this method was 0.01 ~ 70 μg·m L-1, the linear correlation coefficient R was 0.9998 and the detection limit was 0.335 μg·L-1. It has the detection limit of 70 μg·mL-1. This method has high precision and accuracy. Using MP-AES was established to determine extraction of aluminum and the aluminum contentin in forest soil. We found that using the method of KF-EDTA in LY/T1257-1999 and LY/T 1257-1999 respectively, the determination results of extraction of aluminum has no significant difference [P=0.879 å'Œ P=0.911>α(0.05)] and the standard addition recoverythe of determination of total aluminum content in soil was between 99% ~ 104%. Due to using air as working gas, the MP-AES which has high safety performancebe can save running cost and easier to get satisfied condition. Therefore, MP-AES was a feasible method for determination of Al in Forest Soil.(2) MP- AES was used to study the adsorption-desorption behavior and its influencing factors of aluminum in Planosol soil. The results showed that the adsorption desorption process of aluminium was divided into two stages, and its adsorption capacity was 1630.2 mg·kg-1 in Planosol soil. Adsorption process of Al accorded with Langmuir isotherm, and its adsorption dynamics associated with the initial concentration of aluminum from external source. Saturated adsorption of aluminum in Planosol soil was 24.4 mg·kg-1, so Planosol soil has a strong ability to adsorpt and retain aluminum. Planosol soil saturated adsorption amount of aluminum, was reduced gradually when the adsorption temperature was increased from 15℃ to 35℃, which has less effect on the desorption. So temperature has mainly effect on the adsorption process.The adsorption quantity of aluminum was increases when the pH was increased from 3 to 6, and the desorption solution was decreases with the pH was increased from 3 to 7. Compared with the original soil, the soil adsorption quantity of aluminumwas reduced Planosol soil which removed organic matter soil adsorption quantity of aluminum decrease to 1149 mg·kg-1 at Planosol soil which was removed organic matter. The adsorption contribution rate of aluminum from the organic matter was 42.04 %, and the biggest desorption quantity of aluminum at the soil after the removal of organic matter increased 1.87 times. The high organic matter content can promote the aluminum adsorption and was not conducive to aluminum desorption. When the F-,HPO42- were in the adsorption system, which can promote aluminum adsorption and reduce the desorption amount of aluminum. When the NaCl and Na2SO4 were electrolyte in the adsorption system, the aluminum adsorption quantity increased firstly and then decreased, which led to the increase of desorption quantity. NH4 + was not conducive to adsorption of aluminum. |
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