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砷形态分析方法 被引量:5

The Method of Arsenic Speciation
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摘要 建立了水环境中的4种砷形态亚砷酸(As(Ⅲ))、砷酸(As(Ⅴ))、一甲基砷酸(MMA)、二甲基砷酸(DMA)的形态分析方法.在pH6.0磷酸盐作流动相、梯度洗脱条件下,4种砷形态在IC-Anion-PW阴离子交换色谱上获得了分离.以20g/L的K2S2O8溶液作氧化剂,紫外催化氧化消解,可使有机砷完全转化为无机态的As(Ⅴ).并在10%的盐酸载流、20g/L KBH4+5g/L KOH溶液为还原剂的条件下,实现了氢化发生原子荧光检测.将所建立的方法用于地下水样品的测定,4种形态砷系物在0~20mg/L的质量浓度范围内都表现出良好的线性关系,各检出限均保持在约0.1μg/L水平,回收率控制在95%~110%以内,相对标准偏差≤3%. The speciation for arsenious acid (As (Ⅲ)), arsenic acid (As(Ⅴ )), mono-methyl arsenate (MMA) and di-methyl arsenate (DMA) was developed for environmental water samples. The separation of the four arsenic species was achieved by means of a IC - Anion - PW ion-exchange chromatographic system at pH 6.0, and a gradient programe by using phosphate as mobile phase. DMA was converted to As (Ⅴ) by using 20 g/L K2 S2 O8 solution and UV-irradiation. AFS measurement was accomplished by using 10% hydrochloric acid as carrier solution, 20 g/L KBH4 + 5 g/L KOH solution as reducing agent. It is found that it is good on linearity for the four arsenic species in the range of 0 - 20 mg/L, and has low detection limit around 0. 1 μg/L, high recovery between 95%- 110%, and lower relative standard deviation than 3 %.
出处 《东华大学学报(自然科学版)》 CAS CSCD 北大核心 2009年第1期62-68,共7页 Journal of Donghua University(Natural Science)
基金 上海市三维城市地质调查项目资助(1212010511102)
关键词 形态分析 高效液相色谱(HPLC) UV催化氧化 原子荧光光谱(AFS) arsenic speciation high performance liquid chromatography (HPLC) UV photo-oxidation atomic fluorescence spectrometry (AFS)
作者简介 顾婕(1982-),女,天津人,硕士,研究方向为环境分析.E—mail:gujie_0902@163.com 邵超英(通讯联系人),女,副教授,E-mail:shaocy@dhu.edu.cn
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参考文献16

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