多种色谱质谱联用技术测定沉积物中的十溴二苯醚
Determination of decabromodiphenyl ether in sediment using chromatography-mass spectrometry methods
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摘要: 随着十溴二苯醚(BDE-209)正式进入《斯德哥尔摩公约》名单,准确测量其浓度水平对研究其环境行为具有重要意义.本文对多种色谱质谱联用技术——气相色谱-负化学电离质谱(GC-NCI-MS)、气相色谱-电子轰击电离质谱(GC-EI-MS)、气相色谱-电感耦合等离子体质谱(GC-ICP-MS)和高效液相色谱-电感耦合等离子体质谱(HPLC-ICP-MS)进行了优化和评估,并对其在实际环境沉积物样品中检测BDE-209的性能进行了考察.4种检测方法的定量限为3—200 ng·mL-1,在0.5-10 μg·mL-1的范围内有良好的线性关系(r2 > 0.995),测量结果的相对标准偏差(RSD)在0.5%—8.7%之间,可以满足BDE-209分析检测的需求.应用到沉积物实际样品的检测时,各方法测量结果的RSD为0.7%—15.7%,基质效应为98%—166%,其中GC-EI-MS和GC-NCI-MS表现出基质增强效应且分析结果的稳定性受到影响,可通过内标或基质加标方式进行校正,GC-ICP-MS、HPLC-ICP-MS几乎不受实际样品基质的影响,测量结果的准确性良好.Abstract: The accurate determination of decabrominated diphenyl ethers (BDE-209) is important for the study of its environmental behavior, especially after BDE-209 was officially listed in Stockholm Convention in 2017. This research optimized and evaluated most widely used gas/liquid chromatography-mass spectrometry methods for BDE-209 determination, including GC-NCI-MS, GC-EI-MS, GC-ICP-MS and HPLC-ICP-MS. The performances of each method were investigated for standard solution determination and field sediment samples determination. The limits of quantification ranged from 3-200 ng·mL-1 and linear fitting with coefficients >0.995 ranging from 0.5 to 10 μg·mL-1. The precision of each method was illustrated by relative standard deviation (RSD) of analysis results (n=5) ranging from 0.5%-8.7%. The performances of each method on field sediment sample analysis were investigated and the results showed the precision and matrix effects were 0.7%-15.7% and 98%-166%. GC-EI-MS and GC-NCI-MS signal intensities were enhanced, and the precision was affected by introduction of sediment matrix. Internal standards and matrix match calibration were suggested for these methods to analyze field samples. GC-ICP-MS and HPLC-ICP-MS showed robust performances with neglectable effects by sample matrix.
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