TY - JOUR
T1 - Complexation of Iron and Copper in Ambient Particulate Matter and Its Effect on the Oxidative Potential Measured in a Surrogate Lung Fluid
AU - Wei, Jinlai
AU - Yu, Haoran
AU - Wang, Yixiang
AU - Verma, Vishal
N1 - Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2019/2/5
Y1 - 2019/2/5
N2 - We investigated the complexation state of atmospheric iron and copper and its impact on the oxidative potential (OP) of ambient PM 2.5 (PM, particulate matter). A novel fractionation scheme was developed to segregate three different fractions of Fe and Cu present in ambient PM 2.5 : (i) complexed with hydrophobic organic compounds, (ii) complexed with hydrophilic organic compounds, and (iii) free or inorganic metal fraction. A solid phase extraction (C-18) column was used to separate these fractions. The fractionation scheme applied to the ambient PM 2.5 samples collected from an urban site showed that up to 70-90% of water-soluble Fe and Cu were complexed with the organic compounds. The capability of the complexes of Fe(II) and Cu(II) with Suwanee river fulvic acid (SRFA), a proxy for the atmospheric organic compounds, to generate reactive oxygen species (ROS) (·OH and H 2 O 2 ) in a surrogate lung fluid (SLF) was measured. The complex of Fe-SRFA showed a strong synergistic effect in the generation of ·OH in SLF, while that of Cu-SRFA showed an additive effect. Overall, our results indicate that organic complexation of the metals in ambient PM could significantly alter their OP and needs to be considered while assessing their health impacts.
AB - We investigated the complexation state of atmospheric iron and copper and its impact on the oxidative potential (OP) of ambient PM 2.5 (PM, particulate matter). A novel fractionation scheme was developed to segregate three different fractions of Fe and Cu present in ambient PM 2.5 : (i) complexed with hydrophobic organic compounds, (ii) complexed with hydrophilic organic compounds, and (iii) free or inorganic metal fraction. A solid phase extraction (C-18) column was used to separate these fractions. The fractionation scheme applied to the ambient PM 2.5 samples collected from an urban site showed that up to 70-90% of water-soluble Fe and Cu were complexed with the organic compounds. The capability of the complexes of Fe(II) and Cu(II) with Suwanee river fulvic acid (SRFA), a proxy for the atmospheric organic compounds, to generate reactive oxygen species (ROS) (·OH and H 2 O 2 ) in a surrogate lung fluid (SLF) was measured. The complex of Fe-SRFA showed a strong synergistic effect in the generation of ·OH in SLF, while that of Cu-SRFA showed an additive effect. Overall, our results indicate that organic complexation of the metals in ambient PM could significantly alter their OP and needs to be considered while assessing their health impacts.
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U2 - 10.1021/acs.est.8b05731
DO - 10.1021/acs.est.8b05731
M3 - Article
C2 - 30589257
AN - SCOPUS:85059975364
SN - 0013-936X
VL - 53
SP - 1661
EP - 1671
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 3
ER -