Hot ’n’ Fast - Microplastic Screening by Pyrolysis-GC-MS

Apr
11
2018

Analytica Conference > GDCh / Room 5 > Analysis of Microplastics

11. Apr 2018
17:00-17:30 h  |  ICM - Internationales Congress Center München Room 5

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Subjects: 

Analytic

|

Applications

Speaker: 

Dr. Georg Dierkes 

(German Federal Institute of Hydrology)

Type:
Lecture
Speech: English

Quantification of microplastics in environmental samples is a big challenge for analytical chemists. Due to their special properties (very high molecular weights, pure solubility) plastics can’t be analyzed by classical analytical methods (e.g. GC-MS, LC-MS-MS).
However, at high temperatures and under inert gas atmosphere (pyrolysis) polymers decompose into low-molecular fragments. The pattern of these fragments is typical for the polymer type and can be utilized for the identification of plastics. Combination of pyrolysis and gas chromatography coupled to mass spectrometry (Pyr-GC-MS) turned out to be a powerful tool for microplastic analysis. During Pyr-GC-MS analysis small amounts of plastic (ca. 100 μg) are decomposed at high temperature (ca. 600 °C) and the generated pyrolysis products are separated by gas chromatography. After mass spectrometric detection a so called pyrogram is obtained. By comparison of these pyrograms with libraries an unambiguous identification of small plastic particles is enabled. Due to the specificity of some pyrolysis products identification and quantification of mixtures of different plastics and even in environmental samples is possible. Using specific indicator compounds the most important plastics (polyethylene, polypropylene, polystyrene and poly(ethylene terepthalate)) can be directly quantified in environmental samples like sediment and suspended particulate matter even at low concentrations (mg/g).
But for a comprehensive characterization of plastics identification of the polymer type is not sufficient enough. For protection and functionalization of plastics special chemical substances are added during processing. These so called additives are often suspected to be responsible for toxicological effects of microplastics. By thermal desorption (ca. 300 °C) the additives can be extracted from the polymer matrix and analyzed by GC-MS.
Within this presentation the theoretical concepts and applicability of Pyr-GC-MS are demonstrated by means of data from microplastic monitoring in environmental samples.

Speaker
Dr. Georg Dierkes (Department G2 - Aquatic Chemistry), German Federal Institute of Hydrology Show Profile

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EntranceEast
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ICM
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Apr
11
2018

Analytica Conference > GDCh / Room 5 > Analysis of Microplastics

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11. Apr 2018
15:00-15:30 h  |  ICM - Internationales Congress Center München Room 5
Speaker: Prof. Dr. Heather Leslie (Vrije Universiteit Amsterdam)

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Apr
10
2018

Analytica Conference > GDCh / Room 5 > Analysis of Microplastics

Robust Chemometrics for the Characterisation of Environmental Microplastics based on FTIR

10. Apr 2018
16:30-17:00 h  |  ICM - Internationales Congress Center München Room 5
Speaker: Gerrit Renner (Hochschule Niederrhein)

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Apr
11
2018

Analytica Conference > GDCh / Room 5 > Analysis of Microplastics

Identification and Quantification of Microplastic: Focus on Raman Microspectroscopic Analysis

11. Apr 2018
16:00-16:30 h  |  ICM - Internationales Congress Center München Room 5
Speaker: Dr. Natalia P. Ivleva (TU München)

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Apr
11
2018

Analytica Conference > GDCh / Room 5 > Analysis of Microplastics

Identification and Quantification of Microplastics by FTIR Imaging and Automated Analysis

11. Apr 2018
15:30-16:00 h  |  ICM - Internationales Congress Center München Room 5
Speaker: Dr. Sebastian Primpke (Alfred-Wegener-Institute Helmholtz Center for Polar and Marine Research)

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