Leaching of microplastics by preferential flow in earthworm (Lumbricus terrestris) burrows

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

In the current study, we examine how the activities of earthworms (Lumbricus terrestris) affect microplastic (MP) distribution and concentration in soil, with a focus on low density polyethylene (LDPE). We also want to determine if MPs can be flushed out with water. We used a laboratory sandy soil column (polyvinyl chloride tube) experimental set-up and tested five different treatments: (1) treatment with just soil (control) to check if the saturated conductivity (Ksat) could be impacted by MP, (2) treatment with MP, (3) treatment with MP and litter, (4) treatment with earthworms and litter as a second control for treatment 5 and (5) treatment with MPs, earthworms and litter. Each treatment consisted of eight replicates. For the treatments with MP, the concentration of MP added at the start of the experiment was 7 % by weight (3.97 g, polyethylene, 50 % 1 mm-250 μm, 30 % 250 μm-150 μm and 20 % <150 μm) based on 52.78 g of dry litter from Populus nigra. In the treatments using earthworms, two adult earthworms, with an initial average weight of (7.14 ± 0.26) g, were placed in each column. Results showed that LDPE particles could be introduced into the soil by the earthworms. MP particles were detected in each soil sample and within different soil layers for the earthworm treatments. Earthworms showed a tendency to transport the smaller MP particles and that the amount of MPs in size class <250 μm increased in soil samples with increasing soil depth in comparison to the other size classes. After leaching, MPs were only detected in the leachate from the treatments with the earthworms, and the MP had similar size distributions as the soil samples in the 40-50 cm layer of the treatment with MP, earthworms and litter. The results of this study clearly show that biogenic activities can mobilise MP transport from the surface into the soil and even be leached into drainage. It is highly likely that biogenic activities constitute a potential pathway for MPs to be transported into soil and groundwater.

LanguageEnglish
Pages31-40
JournalEnvironmental Chemistry
Volume16
Issue number1
Early online date15 Jan 2019
DOIs
Publication statusPublished - 15 Jan 2019

Fingerprint

preferential flow
burrow
earthworm
Leaching
leaching
Soils
litter
soil
Polyethylene
soil column
soil depth
sandy soil
Polyvinyl Chloride
leachate
Drainage
conductivity
Groundwater
drainage
groundwater

Keywords

  • floating method
  • groundwater
  • litter
  • soil column

Cite this

@article{4962bb11e1384d0198897d6cae59789a,
title = "Leaching of microplastics by preferential flow in earthworm (Lumbricus terrestris) burrows",
abstract = "In the current study, we examine how the activities of earthworms (Lumbricus terrestris) affect microplastic (MP) distribution and concentration in soil, with a focus on low density polyethylene (LDPE). We also want to determine if MPs can be flushed out with water. We used a laboratory sandy soil column (polyvinyl chloride tube) experimental set-up and tested five different treatments: (1) treatment with just soil (control) to check if the saturated conductivity (Ksat) could be impacted by MP, (2) treatment with MP, (3) treatment with MP and litter, (4) treatment with earthworms and litter as a second control for treatment 5 and (5) treatment with MPs, earthworms and litter. Each treatment consisted of eight replicates. For the treatments with MP, the concentration of MP added at the start of the experiment was 7 {\%} by weight (3.97 g, polyethylene, 50 {\%} 1 mm-250 μm, 30 {\%} 250 μm-150 μm and 20 {\%} <150 μm) based on 52.78 g of dry litter from Populus nigra. In the treatments using earthworms, two adult earthworms, with an initial average weight of (7.14 ± 0.26) g, were placed in each column. Results showed that LDPE particles could be introduced into the soil by the earthworms. MP particles were detected in each soil sample and within different soil layers for the earthworm treatments. Earthworms showed a tendency to transport the smaller MP particles and that the amount of MPs in size class <250 μm increased in soil samples with increasing soil depth in comparison to the other size classes. After leaching, MPs were only detected in the leachate from the treatments with the earthworms, and the MP had similar size distributions as the soil samples in the 40-50 cm layer of the treatment with MP, earthworms and litter. The results of this study clearly show that biogenic activities can mobilise MP transport from the surface into the soil and even be leached into drainage. It is highly likely that biogenic activities constitute a potential pathway for MPs to be transported into soil and groundwater.",
keywords = "floating method, groundwater, litter, soil column",
author = "Miao Yu and {Van Der Ploeg}, Martine and Lwanga, {Esperanza Huerta} and Xiaomei Yang and Shaoliang Zhang and Xiaoyi Ma and Ritsema, {Coen J.} and Violette Geissen",
year = "2019",
month = "1",
day = "15",
doi = "10.1071/EN18161",
language = "English",
volume = "16",
pages = "31--40",
journal = "Environmental Chemistry",
issn = "1448-2517",
publisher = "CSIRO Publishing",
number = "1",

}

Leaching of microplastics by preferential flow in earthworm (Lumbricus terrestris) burrows. / Yu, Miao; Van Der Ploeg, Martine; Lwanga, Esperanza Huerta; Yang, Xiaomei; Zhang, Shaoliang; Ma, Xiaoyi; Ritsema, Coen J.; Geissen, Violette.

In: Environmental Chemistry, Vol. 16, No. 1, 15.01.2019, p. 31-40.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Leaching of microplastics by preferential flow in earthworm (Lumbricus terrestris) burrows

AU - Yu, Miao

AU - Van Der Ploeg, Martine

AU - Lwanga, Esperanza Huerta

AU - Yang, Xiaomei

AU - Zhang, Shaoliang

AU - Ma, Xiaoyi

AU - Ritsema, Coen J.

AU - Geissen, Violette

PY - 2019/1/15

Y1 - 2019/1/15

N2 - In the current study, we examine how the activities of earthworms (Lumbricus terrestris) affect microplastic (MP) distribution and concentration in soil, with a focus on low density polyethylene (LDPE). We also want to determine if MPs can be flushed out with water. We used a laboratory sandy soil column (polyvinyl chloride tube) experimental set-up and tested five different treatments: (1) treatment with just soil (control) to check if the saturated conductivity (Ksat) could be impacted by MP, (2) treatment with MP, (3) treatment with MP and litter, (4) treatment with earthworms and litter as a second control for treatment 5 and (5) treatment with MPs, earthworms and litter. Each treatment consisted of eight replicates. For the treatments with MP, the concentration of MP added at the start of the experiment was 7 % by weight (3.97 g, polyethylene, 50 % 1 mm-250 μm, 30 % 250 μm-150 μm and 20 % <150 μm) based on 52.78 g of dry litter from Populus nigra. In the treatments using earthworms, two adult earthworms, with an initial average weight of (7.14 ± 0.26) g, were placed in each column. Results showed that LDPE particles could be introduced into the soil by the earthworms. MP particles were detected in each soil sample and within different soil layers for the earthworm treatments. Earthworms showed a tendency to transport the smaller MP particles and that the amount of MPs in size class <250 μm increased in soil samples with increasing soil depth in comparison to the other size classes. After leaching, MPs were only detected in the leachate from the treatments with the earthworms, and the MP had similar size distributions as the soil samples in the 40-50 cm layer of the treatment with MP, earthworms and litter. The results of this study clearly show that biogenic activities can mobilise MP transport from the surface into the soil and even be leached into drainage. It is highly likely that biogenic activities constitute a potential pathway for MPs to be transported into soil and groundwater.

AB - In the current study, we examine how the activities of earthworms (Lumbricus terrestris) affect microplastic (MP) distribution and concentration in soil, with a focus on low density polyethylene (LDPE). We also want to determine if MPs can be flushed out with water. We used a laboratory sandy soil column (polyvinyl chloride tube) experimental set-up and tested five different treatments: (1) treatment with just soil (control) to check if the saturated conductivity (Ksat) could be impacted by MP, (2) treatment with MP, (3) treatment with MP and litter, (4) treatment with earthworms and litter as a second control for treatment 5 and (5) treatment with MPs, earthworms and litter. Each treatment consisted of eight replicates. For the treatments with MP, the concentration of MP added at the start of the experiment was 7 % by weight (3.97 g, polyethylene, 50 % 1 mm-250 μm, 30 % 250 μm-150 μm and 20 % <150 μm) based on 52.78 g of dry litter from Populus nigra. In the treatments using earthworms, two adult earthworms, with an initial average weight of (7.14 ± 0.26) g, were placed in each column. Results showed that LDPE particles could be introduced into the soil by the earthworms. MP particles were detected in each soil sample and within different soil layers for the earthworm treatments. Earthworms showed a tendency to transport the smaller MP particles and that the amount of MPs in size class <250 μm increased in soil samples with increasing soil depth in comparison to the other size classes. After leaching, MPs were only detected in the leachate from the treatments with the earthworms, and the MP had similar size distributions as the soil samples in the 40-50 cm layer of the treatment with MP, earthworms and litter. The results of this study clearly show that biogenic activities can mobilise MP transport from the surface into the soil and even be leached into drainage. It is highly likely that biogenic activities constitute a potential pathway for MPs to be transported into soil and groundwater.

KW - floating method

KW - groundwater

KW - litter

KW - soil column

U2 - 10.1071/EN18161

DO - 10.1071/EN18161

M3 - Article

VL - 16

SP - 31

EP - 40

JO - Environmental Chemistry

T2 - Environmental Chemistry

JF - Environmental Chemistry

SN - 1448-2517

IS - 1

ER -