Detection of Plasticizers in Soil Using Surface Desorption Atmospheric Pressure Chemical Ionization Imaging Mass Spectrometry

作者：Wang Nan Nan; Wang Hai Dong; Ding Jian Hua; Ouyang Yong Zhong; Zhu Xiao Bin; Chen Huan Wen^*

来源：Chinese Journal of Analytical Chemistry, 2014, 42(4): 547-551.

DOI：10.1016/S1872-2040(13)60724-0

• Surface desorption atmospheric pressure chemical ionization tandem mass spectrometry
• Diethyl phthalate
• Soil
• Mass spectrometry imaging

To address the widespread contamination of surface soil by phthalate esters (PAEs), a method based on the surface desorption atmospheric pressure chemical ionization tandem mass spectrometry (SDAPCI-MSn) imaging technology was successfully applied for the direct determination of diethyl phthalate (DEP) in soil without any pretreatment. The precursor ion, protonated diethyl phthalate (m/z 223), was confirmed by collision-induced dissociation (CID) experiments to exclude false-positive results. The protonated DEP (m/z 223) and the characteristic fragment (m/z 177) were used to obtain the distribution of DEP molecules in the soil using imaging mass spectrometry. The two ion images without any pretreatment showed that the distribution of DEP was inhomogeneous in the shape of clusters, but these two distributions were changed after adding deionized water evenly into the surface of soil. The spatial resolution and the analysis speed per pixel were 0.25 mm(2) and 4.5 s. This new method may be applicable for the study of content and distribution of PAEs in other complex solid samples.

• 出版日期2014-4
• 单位东华理工大学