Study on Adsorption and Desorption Characteristics of Cd2+ and Cu2+ on the Surface Sediments of Sanhuhekou of Yellow River by Using ICP-MS
ZUO Hang1,3, CHEN Yi-zhen1, CHEN Jian-hua1, GUO Yang1, WANG Ru-ming1, FANG Fang1, ZHAO Jia-ying1, LIU Ying1,2*
1. College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China 2. Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing 100081, China 3. China National Environmental Monitoring Centre, Beijing 100012, China
Abstract：In order to study the interaction mechanism between Cd2+, Cu2+ and surface sediments in the upper reaches of the Yellow River, the surface sediment of Sanhuhekou (YRSSM) was chosen as research object with inductively coupled plasma mass spectrometry (ICP-MS) as analysis method. The adsorption reaction condition such as liquid-solid ratio, reaction time and pH were optimized, and the adsorption and desorption characteristics of Cd2+ and Cu2+ onto the surface sediments under the optimized experimental conditions were studied. The results showed that the adsorption capacity of Cu2+ was greater than that of Cd2+, the equilibrium absorption capacity were 0.88 and 0.13 mg·g-1 under each optimum experimental condition, respectively. The adsorptions of Cu2+ and Cd2+ were in accord with the pseudo-second-order kinetic, while adsorption rate of Cu2+ was also greater than that of Cd2+. The adsorption thermodynamics data were in accordance with the Freundlich model and the fitting. Results showed that the adsorption process of Cu2+ and Cd2+ belonged to the preferential adsorption, and were endothermic and spontaneous processes. The desorption process showed that the Elovich equation were suitable for Cd2+ and Cu2+ and belonged to the heterogeneous diffusion. Multi-ions competitive adsorption and desorption experiments indicated that Cu2+ was influenced more by co-existing ion. The study revealed not only the mechanism of adsorption and desorption between Cd2+, Cu2+ and surface sediment in Sanhuhekou, but also the influence of coexisting ions on the adsorption and desorption characteristics. The results demonstrated that the distribution mechanism of heavy metals between solid-liquid phases, and provided a theoretical basis for the migration ability of heavy metals. It also had a guiding significance for establishing heavy metals preventive and control measures of the study area.
Key words：Inductively coupled plasma mass spectrometry (ICP-MS);Sanhuhekou of the Yellow River;Surface sediments;Cd2+;Cu2+;Adsorption-desorption
左 航1,3，陈艺贞1，陈建华1，郭 阳1，王汝明1，方 芳1，赵佳颖1，刘 颖1,2* . ICP-MS研究黄河三湖河口表层沉积物对Cd2+和Cu2+的吸附-解吸特性 [J]. 光谱学与光谱分析, 2017, 37(03): 902-909.
ZUO Hang1,3, CHEN Yi-zhen1, CHEN Jian-hua1, GUO Yang1, WANG Ru-ming1, FANG Fang1, ZHAO Jia-ying1, LIU Ying1,2*. Study on Adsorption and Desorption Characteristics of Cd2+ and Cu2+ on the Surface Sediments of Sanhuhekou of Yellow River by Using ICP-MS. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(03): 902-909.
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