摘要
采用在线离子交换预富集–火焰原子吸收光谱法(FLAAS)测定环境水样中痕量铬(Ⅵ)。通过试验考察样品溶液pH、洗脱剂浓度、离子交换树脂用量及共存离子对离子交换树脂富集效果的影响。结果表明,当交换树脂用量为0.50 g,样品溶液pH值为6.0时,用0.60 mol/L盐酸–10%抗坏血酸进行洗脱具有良好效果。铬(Ⅵ)的质量浓度在0～20.0μg/L之间与吸光度呈良好的线性关系,线性相关系数大于0.9998。该方法用于在线分离和富集环境水样中的铬(Ⅵ),灵敏度提高了100倍,加标回收率为96%～104%。
Trace amount of Cr （ Ⅵ ） was determined by using on-line ion-exchange column preconcentration flame atomic absorption spectroscopy system （IE-FLAAS）. The effects of experimental variables such as the pH of sample, the concentration of eluent, the content of ion-exchange resin and coexisting ions on the recovery of Cr （ VI ） were inspected. The optimum operation conditions were as follows：the content of ion-exchange resin was 0.50 g, the pH of solution was 6.0, the eluent was 0.60 mol/L HCI-10% ascorbic acid. The mass concentration of Cr （ VI ） was linear with absorbance in the range of 0-20.0 μ g/L, the correlation coefficient was more than 0.999. The proposed method was used for on-line separation and preconcentration of Cr （ VI ） in water sample, the sensitivity of IE-FLAAS was 100 times higher than that of FLAAS and recovery was in the range of 96%-104%.
出处
《化学分析计量》
CAS
2013年第1期27-29,共3页
Chemical Analysis And Meterage
基金
重大科学仪器设备开发专项(2011YQ030124
2011YQ060100)
关键词
离子交换分离
预富集
火焰原子吸收光谱法
铬(Ⅵ)
ion-exchange separation
preconcentration
flame atomic absorption spectroscopy （FLAAS）
Cr （ VI ）
