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Liquid crystal monomers in soils near the e-waste recycling site and liquid crystal display manufacturer: Exponential

Jiong-Feng Xie1, Gao-Ling Wei2, Li-Xi Zeng1

  • 1Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 511443, China.

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Summary

Liquid crystal monomers (LCMs) contaminate soils near e-waste recycling and LCD manufacturing sites. E-waste sites show higher LCM concentrations, with significant decreases in soil levels within 2 km.

Keywords:
E-waste recycling parkLCDs manufacturerLiquid crystal monomersSoil contamination

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Area of Science:

  • Environmental Chemistry
  • Contaminant Analysis
  • Ecotoxicology

Background:

  • Liquid crystal monomers (LCMs) are emerging contaminants with potential sources in e-waste recycling and LCD manufacturing.
  • Limited data exists on LCM contamination in soils surrounding these industrial sites.
  • Understanding LCM distribution is crucial for environmental risk assessment.

Purpose of the Study:

  • To investigate LCM contamination in soils near e-waste recycling and LCD manufacturing sites in South China.
  • To quantify concentrations and analyze compositional profiles of 60 target LCMs.
  • To estimate LCM inventories and assess their environmental significance.

Main Methods:

  • Soil samples were collected from e-waste recycling (n=36) and LCD manufacturing (n=41) areas.
  • Quantification of 60 LCMs, including biphenyl analogs (BAs), cyanobiphenyl analogs (CBAs), and fluorinated biphenyl analogs (FBAs).
  • Spatial analysis of LCM concentrations and estimation of soil inventories.

Main Results:

  • Higher LCM concentrations were found near e-waste recycling sites (avg: 4.2 ng/g) compared to LCD manufacturers (avg: 1.5 ng/g).
  • Distinct compositional profiles of LCMs were observed between the two source types.
  • FBAs and BAs showed exponential decreases in concentration with distance from e-waste and LCD sites, respectively.

Conclusions:

  • E-waste recycling and LCD manufacturing are significant point sources of LCM soil contamination.
  • LCM inventories in soils near e-waste sites are substantial, comparable to or exceeding other persistent pollutants.
  • Further research is needed to understand LCMs' environmental fate and behavior in multimedia environments.