摘要
通过完善石墨炉原子吸收光谱法测定土壤中铊的消解方法,改进混合基体改进剂浓度配比,以及调整原子化温度等,建立了针对土壤这种较为复杂的基体,利用日立Z―2000型原子吸收分光光度计测定铊的方法,精密度和准确度均满足实验室要求。结果表明,0.4 g/L硝酸钯和30 g/L抗坏血酸为优化后的混合基体改进剂,采用该基体改进剂,灰化温度采用400~500℃,原子化温度采用2000℃,可以实现土壤中铊的最佳分析性能。优化条件下,土壤中铊的方法检出限为0.1 mg/kg。土壤标准物质的测定值均在标准值允许误差范围内,相对误差在-9.3%~14.6%之间。土壤标准物质以及实际土壤样品6次测定结果的相对标准偏差范围在1.3%~5.3%。
The determination method of thallium in soil by Hitachi Z-2000 atomic absorption spectrophotometer was established by perfecting the digestion method of thallium in soil by graphite furnace atomic absorption spectrometry,improving the ratio of mixed matrix modifier,and adjusting the atomization temperature.The precision and accuracy met the requirements of the laboratory.The results showed that 0.4 g/L palladium nitrate and 30 g/L ascorbic acid were used as the optimized mixed matrix improvers,the ashing temperature was 400-500℃,and the atomization temperature was 2000℃.The best analytical performance of thallium in soil could be achieved.Under optimized conditions,the detection limit of thallium in soil was 0.1 mg/kg.The measured values of soil standard substances were within the allowable error range of the standard values,and the relative error ranged from-9.3%to 14.6%.The relative standard deviation of soil standard materials and actual soil samples were in the range of 1.3%—5.3%.
作者
蔡义珊
姜雪成
钱春燕
吴赞
刘紫譞
邵鹏
Cai Yishan;Jiang Xuecheng;Qian Chunyan;Wu Zan;Liu Zixuan;Shao Peng(Institute of Analysis and Testing,Beijing Academy of Science and Technology,Beijing Center for Physical and Chemical Analysis,Beijing 100089,China)
出处
《分析仪器》
CAS
2022年第6期50-56,共7页
Analytical Instrumentation
基金
2022年北京市改革与发展专项(11000022T000000441011)。
关键词
土壤
铊
基体改进剂
石墨炉
Soil
Thallium
Matrix modifier
Graphite furnace
