The hematologic effects of BTEX exposure among elderly residents in Nanjing: a cross-sectional study
Few studies have examined the effects of environmental concentrations of benzene, toluene, ethylbenzene, and xylene (BTEX) on the hematologic system of residents near a petrochemical complex. This study evaluated the potential effects of blood BTEX concentrations on the hematologic parameters of residents in a community near a petrochemical complex (contaminated group) and another community free of known petrochemical pollution (control group). Volunteer residents were randomly recruited. Each participant completed a questionnaire and donated blood samples to evaluate blood BTEX concentrations and hematologic parameters. We found the mean concentrations of blood BTEX of the contaminated group were 1.2 to 6.7 times higher than the control group. Multiple hematologic parameters of participants were significantly different between the two study groups. Inverse associations were found for ln-transformed blood benzene concentrations with mean corpuscular hemoglobin concentration (MCHC) (β = − 2.75) and platelet counts (β = −8.18). Several weaker associations were also observed between other compounds and multiple hematologic parameters. Our results suggest that the residents living near petrochemical complexes have higher blood BTEX concentrations. Furthermore, the increased blood BTEX levels in residents are associated with the reduction in RBC counts, hemoglobin concentration, hematocrit, MCHC, and platelet counts. This study provided particularly important information for the health risk assessment of residents living near petrochemical complexes.
KeywordsBTEX Benzene Blood Hematologic parameters Petrochemical
benzene, toluene, ethylbenzene, and xylene
body mass index
generalized linear models
limit of detection
mean corpuscular hemoglobin concentration
mean corpuscular volume
red blood cell
volatile organic compounds
white blood cell
QC and HS contributed to the study design, data procurement, results interpretation, and drafting of the article. JZ was involved in collection of the data. ZD and YX took part in the study design, supervision of the research, data procurement and results interpretation. All authors read and gave their approval for publication.
This study was supported by funds from the Key Talent Project for Medical Young Scholars of Jiangsu Province (QNRC2016551) and Jiangsu social development project (BE2018745).
Compliance with ethical standards
Availability of data and materials
The data that support the findings of this study are available from Jiangsu Provincial Commission of Health and Family Planning; however, restrictions apply regarding the availability of these data, which were used under a license for the current study, and the data are not publicly available. Data are however available from the authors upon reasonable request and with permission of Jiangsu Provincial Commission of Health and Family Planning.
Consent for publication
Ethics approval and consent to participate
The study protocol was approved by the Ethic Commission of Jiangsu Provincial Center for Disease Control and Prevention; all study participants provided written informed consent.
The authors declare that they have no competing interests.
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