摘要
[目的]建立电感耦合等离子体质谱法（ICP-MS）同时测定大气PM2.5中22种元素的方法。[方法]利用TH-150C空气采样器采集贵阳市南明区及花溪区大气颗粒物,经过分割后的采样滤膜,经超声提取后为检测样本,采用ICP-MS测定PM2.5中22种元素。[结果]22种元素在不同浓度范围内线性方程的相关系数均〉0.998;以采样体积144 m3计,测定元素锂、锑、砷、铍、镉、铬、镍、硒、铊、钒、钴、锶、钼、银、锡、钡、铀、铝、铁、铅、锰、汞的检出浓度分别为0.03,0.09,0.38,0.03,0.03,0.63,1.05,0.39,0.04,0.05,0.03,0.03,0.05,0.06,0.09,1.16,0.05,2.36,1.94,0.85,0.72,0.04 ng/m3;对空白滤膜分低、中、高浓度加入铝、铁、钡混标25.0、50.0、75.0μg/L,汞0.5,2.0,8.0μg/L,其余测定元素5.0、20.0、40.0μg/L,测定回收率范围为74.3%~98.5%,两组标准物质的质控滤膜测定结果满足其不确定度要求;各种元素测定的相对标准偏差范围是2.3%~9.9%。[结论]该方法测定大气PM2.5中22种元素具有较高的灵敏度、准确度及精密度。
[Objective] To establish a method for determining 22 elements in atmospheric PM2.5 simultaneously by inductively coupled plasma mass spectrometry（ICP-MS）. [Methods] Particulate matters in air were sampled with TH-150 air sampler in Nanming District and Huaxi District of Guiyang. Samples were extracted using ultrasound from divided sample filters and measured by ICP-MS. [Results] The correlation coefficients for the 22 elements measured with varied concentration ranges were all 0.998. Within a total sampling volume of 144 m3, the detection concentrations of elements including lithium, stibium, arsenic, beryllium, cadmium, chromium, nickel, selenium, thallium, vanadium, cobalt, strontium, molybdenum, silver, tin, barium, uranium, aluminum, iron, lead, manganese, and mercury were 0.03, 0.09, 0.38, 0.03, 0.03, 0.63, 1.05, 0.39, 0.04, 0.05, 0.03, 0.03, 0.05, 0.06, 0.09, 1.16, 0.05, 2.36, 1.94, 0.85, 0.72, and 0.04 ng/m3, respectively. After the blank membranes were spiked with mixed standards of aluminum, iron, and barium at 25.0, 50.0, and 75.0 μg/L, mercury at 0.5, 2.0, and 8.0 μg/L, and the other elements at 5.0, 20.0, and 40.0 μg/L, the recoveries were between 74.3%-98.5%. The determination results for the two groups of quality control membranes met the requirements on uncertainty. Moreover, the relative standard deviations ranged from 2.3% to 9.9%. [Conclusion] The method is highly sensitive, precise, and accurate for determining the 22 elements in atmospheric PM2.5.
出处
《环境与职业医学》
CAS
CSCD
北大核心
2016年第6期620-623,共4页
Journal of Environmental and Occupational Medicine
关键词
电感耦合等离子体质谱
元素测定
PM2.5
大气环境
inductively coupled plasma mass spectrometry
element determination
PM2.5
atmospheric environment
