磁性壳聚糖对铜的吸附性能研究与应用

Study and application of the adsorption properties of magnetic chitosan on copper

中文关键词:  磁性壳聚糖  铜  吸附  火焰原子吸收光谱法  生活饮用水

英文关键词:magnetic chitosan  copper  absorption  flame atomic absorption spectrometry  drinking water

中文摘要:

      目的 建立基于磁性壳聚糖(magnetic chitosan, MCS)磁性富集, 火焰原子吸收光谱法(flame atomic absorption spectrometry, FAAS)测定饮用水中铜含量的分析方法。方法 以水热法合成MCS, 以MCS为吸附材料, FAAS为检测手段, 考察影响吸附和解析的重要条件。结果 在pH 6.0下恒温40 ℃振荡35 min, 铜能被MCS完全吸附, 饱和吸附容量为28.2 mg/g, 吸附在MCS上的铜可用4 mL 0.1 mol/L硝酸在20 min内完全洗脱。在该吸附和洗脱条件下建立测定铜的分析方法, 线性范围为0.02~5.0 mg/L, 检出限为6.2 μg/L。该方法应用于水中铜的分析, 在自来水、某品牌蒸馏水和公共直饮水中所测的铜含量分别为39.2、26.7、30.2 μg/L, 相对标准偏差(relative standard deviation, RSD)为1.6%~5.1%, 加标回收率为95.9%~103%。结论 该方法准确、灵敏, 适用于生活饮用水中痕量铜的分析检测。

英文摘要:

      Objective To establish a method for determination of copper in drinking water based on MCS enrichment and flame atomic absorption spectrometry (FAAS). Methods MCS was synthesized by hydrothermal method. The conditions of adsorption and desorption were investigated with MCS as adsorption material and FAAS as a detection tool. Results Copper could be adsorbed completely by MCS under the conditions of pH 6.0, temperature of 40 ℃ and oscillation time of 35 min. The saturation adsorption capacity was 28.2 mg/g. The adsorbed copper could be eluted with 4 mL 0.1 mol/L HNO3 within 20 min. An analytical method for determination of copper was established under the adsorption and elution conditions with linear range of 0.02?5.0 mg/L and the limit of detection (LOD) was 6.2 μg/L. This method was applied for determination of copper in domestic and drinking water. The copper content in tap water, a certain brand distilled water and public direct drinking water were 39.2, 26.7, 30.2 μg/L, respectively. The relative standard deviations (RSDs) were 1.6%?5.1% and the standard recovery rates were 95.9%?103%. Conclusion This method is accurate, sensitive, which is suitable for the determination of trace copper in drinking water.