Dung Thuy Nguyen

Dung Thuy Nguyen
Wageningen University & Research | WUR · Soil chemistry and Chemical soil quality

Master of Science
PhD candidate @WUR #microplastic in #soil polymer coated fertilizer #PlasticsAtWUR

About

4
Publications
704
Reads
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9
Citations
Introduction
PhD candidate in Wageningen University and Research - Detection of microplastic in soil and microplastic effect on soil organisms -
Additional affiliations
March 2020 - September 2020
Water Resource Institute
Position
  • Researcher
October 2019 - December 2019
NIOZ Royal Netherlands Institute for Sea Research
Position
  • Intern
Description
  • Fertilisation of marine life with desert dust Leach nutrients from desert dust with increasing corrosive chemicals to assess their bioavailability to marine life.
September 2018 - September 2019
University of Antwerp
Position
  • Master's Student
Description
  • Evaluation of the performance of a multi-contaminant passive sampler for water quality monitoring
Education
September 2017 - February 2020
Vrije Universiteit Brussel - Ghent University - Antwerp University
Field of study
  • Marine and Lacustrine Science and Management
September 2012 - January 2016
University of Science and Technology of Hanoi
Field of study
  • Water-Environment-Oceanography

Publications

Publications (4)
Article
Full-text available
Microplastics (MPs) are increasingly being studied because they have become ubiquitous in aquatic and terrestrial environments. However, little is known about the negative effects of co-contamination by polypropylene microplastic (PP MPs) and heavy metal mixtures on terrestrial environment and biota. This study assessed the adverse effects of co-ex...
Preprint
Full-text available
Microplastics (MPs) are increasingly being studied because they have become ubiquitous in aquatic and terrestrial environments. For example, little is known about the negative effects of co-contamination by polypropylene microplastic (PP MPs) and heavy metal mixtures on terrestrial environment and biota. This study assesses the adverse effects of c...

Questions

Question (1)
Question
I follow the soil sequential leaching procedure listed in this paper with a soil sample from Mauritania. The following is the basic steps.
The chemicals sequence are 1M Ammonium acetate => 1M Acid acetic => 1M Nitric acid => Burn in oven at 500 degree in 8 hours => Milli Q => Total digestion.
Samples are equilibrated for 24 hours. Supernatants are collected after centrifugation then the samples are washed with MQ to get rid of the chemicals. The wash solution are also collected after vortex and centrifugation. The samples are then resuspend in MQ and dry in oven overnight at 60 degree.
Nothing comes out in the first 3 steps. However, in the final Milli Q steps (after burning in oven at 500 degree), even after centrifugation, the supernatant is red and turbid. I let it sit for a few days but it didn't change. When I added concentrated Nitric acid (15M) to reach 1% concentration, the supernatants quickly flocculated and settled down as pic attached.
I tried adding 2mL HCl 32% into 0.5mL sludge then vortex but it doesn't dissolve at all. So what happens here?
I will try to test the sludge on XRF or SEM to know the composition of the sludge but I am interested in knowing what is the mechanism after this phenomenon. If there's any info I can provide/clarify please ask.
Thank you!

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