摘要
目的 通过改进实验条件,研究共存元素的影响,改进石墨炉原子吸收法测定水中铝的方法。方法 样品中加入1%硝酸,以2μl的50 g/L硝酸镁作为基体改进剂,采用涂钽石墨管,二步连续斜坡升温并二步灰化,利用石墨炉原子吸收法测定水中铝。结果 铝含量在0~80.0μg/L范围内呈线性关系,线性相关系数为0.997~0.999。检出限为3.0μg/L。水中铝加标回收率在85%~112%,RSD为1.57%~4.38%。较高浓度的钙和硫酸盐对其测定结果产生正干扰。结论 该方法灵敏度高,精密度和准确度较好,适用于一般水中铝的含量测定。
[Objective]To improve GFAAS method for determination of aluminum in water, through changing the experimental conditions and studying the impaction of coexisting elements.[Methods]1% nitric acid and 2 μl 50 g/L of magnesium nitrate was added （as matrix modifier） into the samples, using tantalum coated graphite tube, two-step continuous ramp temperature programming and two-step ashing, GFAAS was applied to determine aluminum in water. [Results]The linear range was 0-800 μg/L, and the linear correlation were 0.997-0.999, The detection limit was 3.0 μg/L. The recovery of spiked samples in water was 85%- 112% , and RSD was 1.57%-4.38%. High concentrations of calcium and sulfate had a positive interference to the resuhs. [Conclusion]This method has high sensitivity, precision and accuracy, and it is suitable for general determination of aluminum in water.
出处
《职业与健康》
CAS
2015年第15期2053-2055,共3页
Occupation and Health
