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<p>Chlorinated paraffins (CPs), emerging persistent organic toxic pollutants, are widely used in industrial production as sizing agents and flame retardants. To assess their pollution distribution and risks in soils of Jiangmen Electronic Industrial Park, surface samples from the park and surroundings were collected and detected using gas chromatography-low resolution mass spectrometry-negative chemical ionization source. Results showed the concentrations of short chain chlorinated paraffins (SCCPs) and medium chain chlorinated paraffins (MCCPs) ranged from 144.4 to 1160&#xa0;ng/g&#xa0;dw and 90.5 to 1020&#xa0;ng/g&#xa0;dw, with chlorine contents of 60.8% ~ 62.8% and 56.7% ~ 58.2% respectively. The CPs contents varied significantly among different sampling points, with the highest concentration in canal-side soils. Hierarchical clustering grouped 20 samples into 4 clusters, with the homologue composition mainly C<sub>10</sub>Cl<sub>6–7</sub>, C<sub>13</sub>Cl<sub>7–8</sub> and C<sub>14</sub>Cl<sub>7–9</sub>. Principal component analysis indicated that the toxic sources might be related to the production and use of commercial products such as CP-42 and CP-52. Risk assessment showed SCCPs RQ 0.0273 ~ 0.2199, covering low and medium risks; MCCPs RQ 0.0032 ~ 0.0364, covering low and extremely low risks. Human exposure assessment showed the CPs exposure of adults and children through soil ingestion and skin contact was lower than 10&#xa0;μg&#xa0;(kg·d)<sup>−1</sup>, indicating the toxic and health risks in Jiangmen Electronic Industrial Park were low.</p>

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Pollution distribution characteristics, source tracing and risk assessment of chlorinated paraffins in soils of electronic industrial parks and associated environments

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Le Gao,
  • Gnanachandrasamy Gopalakrishnan,
  • Pinjie Liu,
  • Xiaoying Ou,
  • Yuying Zhang

摘要

Chlorinated paraffins (CPs), emerging persistent organic toxic pollutants, are widely used in industrial production as sizing agents and flame retardants. To assess their pollution distribution and risks in soils of Jiangmen Electronic Industrial Park, surface samples from the park and surroundings were collected and detected using gas chromatography-low resolution mass spectrometry-negative chemical ionization source. Results showed the concentrations of short chain chlorinated paraffins (SCCPs) and medium chain chlorinated paraffins (MCCPs) ranged from 144.4 to 1160 ng/g dw and 90.5 to 1020 ng/g dw, with chlorine contents of 60.8% ~ 62.8% and 56.7% ~ 58.2% respectively. The CPs contents varied significantly among different sampling points, with the highest concentration in canal-side soils. Hierarchical clustering grouped 20 samples into 4 clusters, with the homologue composition mainly C10Cl6–7, C13Cl7–8 and C14Cl7–9. Principal component analysis indicated that the toxic sources might be related to the production and use of commercial products such as CP-42 and CP-52. Risk assessment showed SCCPs RQ 0.0273 ~ 0.2199, covering low and medium risks; MCCPs RQ 0.0032 ~ 0.0364, covering low and extremely low risks. Human exposure assessment showed the CPs exposure of adults and children through soil ingestion and skin contact was lower than 10 μg (kg·d)−1, indicating the toxic and health risks in Jiangmen Electronic Industrial Park were low.