湿法消解火焰原子吸收法测定黄土复合污染修复植物金盏菊幼苗中的铅和镉

原子吸收光谱法(AAS)广泛应用于重金属分析检测领域,优化测试过程的操作条件,进而保障分析结果的稳定性和重现性,直接关系到预期研究目标的有效实现,建立精准的检测方法往往成为科学研究的首要任务。以金盏菊为黄土区Pb/Cd复合污染修复植物,采用湿法消解-AAS法测定金盏菊幼苗体内Pb/Cd含量,分析所得结果初步揭示金盏菊幼苗对Pb/Cd的富集效应。研究发现:湿法消解-AAS法对Pb/Cd的检出限分别为0.104和0.007 mg·L~(-1),Pb/Cd回收率对应于94.33%~110.78%和97.73%~107.50%之间,同一样品重复测定(6次)的相对标准偏差(RSD)波动于4.11%~4.75%(Pb)和1.11%~2.77%(Cd),表明该方法准确度较好,精密度较高。金盏菊幼苗对Pb的富集能力不强,这可能与Pb的电负性、植物生长周期较短及环境因子等因素有关;但在黄土Cd浓度为50 mg·k~(-1)时,金盏菊幼苗对Cd的平均富集量已达到104.85 mg·kg~(-1)。此外,黄土Pb的共存一定程度上促进了金盏菊幼苗对Cd的吸收,其间可能存在协同作用。所建立的分析方法可以对金盏菊幼苗Pb/Cd含量进行有效检测,预期能为后续研究提供技术支持和质量保障。

Determination of Lead and Cadmium in Calendula Officinalis Seedlings for Phytoremediation of Multi-Contaminated Loess by Using Flame Atomic Absorption Spectrometry with Wet Digestion

Atomic absorption spectrometry (AAS)is widely used in the analysis and detection of heavy metals.The optimal operation conditions on metals detection are important for the stabilization and repeatability of scientific research,which affects the expected inves-tigation objectives greatly.Thus,it becomes a key issue to establish appropriate detection methods in scientific works.Calendula offi-cinalis was used for lead/cadmium remediation in contaminated loess,and the flame atomic absorption spectrometry (FAAS)with wet digestion was applied to analyze the contents of lead/cadmium in Calendula officinalis seedlings.The investigation data was further studied to reveal the bioaccumulation efficiency of lead/cadmium in Calendula officinalis seedlings.The results showed:the limits of detection are 0.104 and 0.007 mg·L-1 for lead and cadmium;the recovery rates of lead and cadmium are from 94.33% to 110.78%and 97.73% to 107.50% respectively.The relative standard deviations (RSD)are between 4.11% and 4.75% for lead while between 1.11% and 2.77% for cadmium,and It’s been proved that the method is accurate and reliable.The low accumulation efficiency of lead with Calendula officinalis seedlings might be related to the electronegativity of lead while the growth period of calendula officinalis seedlings and environmental factors.The accumulation content of cadmium is 104.85 mg·kg-1 with cadmium concentration of 50 mg· kg-1 .The co-existing of lead in loess is positive for cadmium accumulation by Calendula officinalis seedlings,and the synergistic effect might work in the process.The established detection method is effective for quantitative analysis of lead and cadmium in calendula offi-cinalis seedlings and significant for future research.