蜈蚣草吸收和氧化As(Ⅲ)的试验及动力学研究  被引量:1

Study on the absorption and oxidation of As(Ⅲ) by Pteris vittata L.

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作  者:宋卫锋[1] 严明[1] 李勇 宾丽英[1] 张昆峰[1] 刘书敏[1] 

机构地区:[1]广东工业大学环境科学与工程学院,广东广州510006 [2]广东省环境保护工程研究设计院,广东广州510630

出  处:《环境污染与防治》2011年第9期50-53,共4页Environmental Pollution & Control

摘  要:通过蜈蚣草室内水培试验,研究了蜈蚣草对As(Ⅲ)的吸收特性和动力学规律。结果表明,蜈蚣草在吸收As(Ⅲ)的同时,可以将As(Ⅲ)氧化为As(Ⅴ),然后再进行吸收;当培养液中As(Ⅲ)初始浓度较低(10.00 mg/L)时,蜈蚣草对砷的吸收和氧化过程较好地符合一级动力学规律,表观速率常数为0.104 h-1,当初始质量浓度为20.00~50.00 mg/L时,砷吸收过程不符合一级动力学规律,需用Michaelis-Menten方程加以描述;当培养液中As(Ⅲ)初始浓度较低时,蜈蚣草直接吸收As(Ⅲ)、氧化As(Ⅲ)和吸收As(Ⅴ)的表观速率常数分别为0.093、0.011、0.224 h-1;在被吸收的总砷中,以As(Ⅴ)形式吸收的只是一小部分。The absorption captivity of Pteris vittata L.to As(Ⅲ) was studied through hydroponics experiments,the absorption dynamic was also investigated.Results showed that Pteris vittata L.could absorb As(Ⅲ) effectively,at the same time,it could oxidize As(Ⅲ) to As(Ⅴ) before the absorption.When the initial concentration of As(Ⅲ) was lower than 10.00 mg/L,the absorption process could be fitted by the first order kinetics with the absorption rate constant was 0.104 h-1;when the initial concentration of As(Ⅲ) ranged 20.00-50.00 mg/L,As(Ⅲ) absorption process could not described by the first order kinetics but Michaelis-Menten equation.When the initial As(Ⅲ) was in low concentration,the absorption rate constants of Pteris vittata L.for As(Ⅲ),oxidized As(Ⅲ) and As(Ⅴ) were 0.093,0.011,0.224 h-1 respectively.As(Ⅴ) contributed only a little part of absorbed arsenic.

关 键 词:蜈蚣草 As(Ⅲ) 吸收 氧化 动力学 

分 类 号:X173[环境科学与工程—环境科学]

 

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