污染控制技术及原理
马志玮,黄清辉,李建华,陈玲.水体沉积物中有效砷的测试新方法研究[J].环境科学学报,2007,27(11):1845-1850
水体沉积物中有效砷的测试新方法研究
- An innovative method to determine available arsenic in aquatic sediment
- 关键词：砷 生物有效性 氧化铁/醋酸纤维素复合膜 沉积物
- 基金项目：上海市科学技术委员会基础研究重点项目(No.05JC14059);污染控制与资源化研究国家重点实验室开放基金(No.PCRRF06009)
- 作者
- 单位
- 马志玮
- 同济大学环境科学与工程学院, 长江水环境教育部重点实验室, 上海 200092
- 黄清辉
- 同济大学环境科学与工程学院, 长江水环境教育部重点实验室, 上海 200092
- 李建华
- 同济大学环境科学与工程学院, 长江水环境教育部重点实验室, 上海 200092
- 陈玲
- 同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092
- 摘要：一种氧化铁/醋酸纤维素复合膜(FeO/CAM)被用于太湖沉积物中砷的生物有效性评估.结果发现,在水介质中,FeO/CAM对沉积物中砷的富集量随土水比增加而呈乘幂函数减少,在土水质量比为0.025(即1∶40)之后趋于某一平台值;在土水比为0.025并得到充分振荡的条件下,沉积物中释放的有效砷被FeO/CAM富集至膜中,并随时间增加而增加,至24h后逐渐趋于平衡,这一过程恰当地模拟了生物对砷的吸收,因此,FeO/CAM可以用于有效砷的体外测试.利用FeO/CAM对12个总砷含量为6.4～34.6mg·kg<
- Abstract：Anew method was developed to assess the bioavailability of arsenic in the sediments of Taihu Lake by using an iron oxide/cellulose acetate membrane (FeO/CAM). The amount of bioavailable arsenic desorbed from the sediment into the water decreased exponentially with the ratio of sediment to water and then stabilized. When the mass ratio of sediment to water was 0.025, the amount of bioavailable arsenic extracted by the FeO/CAMincreased with shaking time until it reached equilibrium after 24h. This process mimicked biological absorption, so FeO/CAMcould be used to measure bioavailable arsenic. The amount of bioavailable arsenic in twelve sediment samples from Taihu lake, in which total concentrations of arsenic ranged from 6.4～34.6 mg·kg-1, were estimated by the FeO/CAMmethod. The results showed that the concentrations of bioavailable arsenic estimated by FeO/CAMwere significantly correlated with those estimated by the phosphate buffer method. The concentrations of bioavailable arsenic in sediments from Taihu Lake were mainly influenced by sediment properties and showed a significant correlation with the concentrations of total arsenic, total phosphorus, organic matter and absorbed phosphorus and the degree of phosphorus sorption. Unlike the chemical extraction method, the FeO/CAMmethod does not extract non-bioavailable arsenic, therefore, the FeO/CAMmethod is a closer estimate of bioavailable arsenic.
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