Standardization of the minimum information for publication of infrared-related data when microplastics are characterized.

Infrared spectrometry (IR) became a workhorse to characterize microplastics (MPs) worldwide. However, reports on the experimental conditions to measure them decreased alarmingly. As complete, relevant information on the instrumental setup determining IR spectra is crucial for scientific reproducibility, ca. 50% of the papers that reported FTIR to measure MPs were evaluated and it was found that most studies cannot be replicated due to missing experimental details. To ameliorate this, the most critical parameters influencing IR spectra are depicted, their impact when matching a spectrum against databases exemplified, and, following efforts from other scientific fields, a minimum information for publication of IR-related data on MPs characterization (MIPIR-MP) is proposed, along with a brief, simple paragraph to resume the most critical information to be reported. This can be used to improve the worrying figures that point out to a reproducibility crisis in the field, as disclosed by the survey.

[1]  Merel Kooi,et al.  Microplastics in freshwaters and drinking water: Critical review and assessment of data quality , 2019, Water research.

[2]  C. Krafft,et al.  Biomedical applications of Raman and infrared spectroscopy to diagnose tissues , 2006 .

[3]  J. A. van Franeker,et al.  Marine microplastic: Preparation of relevant test materials for laboratory assessment of ecosystem impacts. , 2018, Chemosphere.

[4]  P. Larkin.  Infrared and Raman Spectroscopy: Principles and Spectral Interpretation , 2011 .

[5]  Stefan Reimann,et al.  Measuring atmospheric composition change , 2009 .

[6]  J. Cauich‐Rodríguez,et al.  A TG/FTIR study on the thermal degradation of poly(vinyl pyrrolidone) , 2011 .

[7]  Nigel W. Hardy,et al.  Promoting coherent minimum reporting guidelines for biological and biomedical investigations: the MIBBI project , 2008, Nature Biotechnology.

[8]  T. Schmidt,et al.  A New Chemometric Approach for Automatic Identification of Microplastics from Environmental Compartments Based on FT-IR Spectroscopy. , 2017, Analytical chemistry.

[9]  D. Lin-Vien.  The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules , 1991 .

[10]  L. Blomberg,et al.  Dynamic headspace enrichment/reinjection for open tubular GC/FTIR analysis of volatiles in polymers , 1988 .

[11]  Shan-Yang Lin,et al.  An Overview of Advanced Hyphenated Techniques for Simultaneous Analysis and Characterization of Polymeric Materials , 2016 .

[12]  Brian C. Smith.  Fundamentals of Fourier Transform Infrared Spectroscopy , 1995 .

[13]  Olaf R. P. Bininda-Emonds,et al.  Garbage in, Garbage out , 2004 .

[14]  Jianping Yu,et al.  Characterization of microplastics in environment by thermal gravimetric analysis coupled with Fourier transform infrared spectroscopy. , 2019, Marine pollution bulletin.

[15]  D. T. Sparks,et al.  Quantitative gas chromatography/Fourier transform infrared spectrometry with integrated gram-Schmidt reconstruction intensities , 1982 .

[16]  F. Kroon,et al.  Recovering microplastics from marine samples: A review of current practices. , 2017, Marine pollution bulletin.

[17]  A. Gowen,et al.  A review of recent trends in polymer characterization using non-destructive vibrational spectroscopic modalities and chemical imaging. , 2015, Analytica chimica acta.

[18]  T. Knepper,et al.  Instrumental analysis of microplastics—benefits and challenges , 2018, Analytical and Bioanalytical Chemistry.

[19]  Ellen Besseling,et al.  Quality Criteria for the Analysis of Microplastic in Biota Samples: A Critical Review , 2018, Environmental science & technology.

[20]  M. Thiel,et al.  Sources, fate and effects of microplastics in the marine environment: part 2 of a global assessment , 2015 .

[21]  R. Namba.  9 – Industrial Applications of GC/FT-IR , 1990 .

[22]  Jundong Wang,et al.  The behaviors of microplastics in the marine environment. , 2016, Marine environmental research.

[23]  Fiona Fidler,et al.  Reproducibility of Scientific Results , 2018 .

[24]  D. Wilson,et al.  Characterization of cellulose crystallinity after enzymatic treatment using Fourier transform infrared spectroscopy (FTIR) , 2017, Cellulose.

[25]  U. Braun,et al.  Assuring quality in microplastic monitoring: About the value of clean-air devices as essentials for verified data , 2017, Scientific Reports.

[26]  Daniel C. Harris,et al.  Quantitative Chemical Analysis , 1968, Nature.

[27]  A. Andrady.  Plastics and Environment , 2019, Plastics Waste Management.

[28]  Karl Holmberg,et al.  Need a bag? A review of public policies on plastic carrier bags - Where, how and to what effect? , 2019, Waste management.

[29]  Richard C. Thompson,et al.  A Scientific Perspective on Microplastics in Nature and Society , 2019 .

[30]  M. Baker.  1,500 scientists lift the lid on reproducibility , 2016, Nature.

[31]  D. Salem,et al.  Infrared spectroscopic characterization of oriented polyamide 66: Band assignment and crystallinity measurement , 2000 .

[32]  A. Gautam,et al.  A Procedure for Measuring Microplastics using Pressurized Fluid Extraction. , 2016, Environmental science & technology.

[33]  V. Beneš,et al.  The MIQE guidelines: minimum information for publication of quantitative real-time PCR experiments. , 2009, Clinical chemistry.

[34]  Brian A. Nosek,et al.  Promoting an open research culture , 2015, Science.

[35]  John T Elliott,et al.  How measurement science can improve confidence in research results , 2018, PLoS biology.

[36]  I. W. Levin,et al.  Fourier Transform Mid‐infrared Spectroscopic Imaging , 2007 .

[37]  J. Popp,et al.  Removing interference-based effects from the infrared transflectance spectra of thin films on metallic substrates: a fast and wave optics conform solution. , 2018, The Analyst.

[38]  Michael Vollmer,et al.  Infrared Thermal Imaging: Fundamentals, Research and Applications , 2010 .

[39]  Jeremy Berg.  Progress on reproducibility , 2018, Science.

[40]  K. Pozo,et al.  A review of analytical techniques for quantifying microplastics in sediments , 2017 .

[41]  Philip B. Stark,et al.  Before reproducibility must come preproducibility , 2018, Nature.

[42]  Armando C. Duarte,et al.  Microplastics in the environment: Challenges in analytical chemistry - A review. , 2018, Analytica chimica acta.

[43]  S. Belfer.  Surface characterization by FTIR-ATR spectroscopy of polyethersulfone membranes-unmodified, modified and protein fouled , 2000 .

[44]  Gunnar Gerdts,et al.  Methodology Used for the Detection and Identification of Microplastics—A Critical Appraisal , 2015 .

[45]  K. Villberg,et al.  Analysis of odour and taste problems in high-density polyethene. , 1997, Journal of chromatography. A.

[46]  S. Gordon,et al.  Identification and Measurement of Intermolecular Interaction in Polyester/Polystyrene Blends by FTIR-Photoacoustic Spectrometry , 2015, Journal of Polymers and the Environment.

[47]  O. Tretinnikov,et al.  Determination of the degree of crystallinity of poly(vinyl alcohol) by FTIR spectroscopy , 2012 .

[48]  Kristin A Connors,et al.  Advancing the quality of environmental microplastic research , 2017, Environmental toxicology and chemistry.

[49]  S Prati,et al.  New advances in the application of FTIR microscopy and spectroscopy for the characterization of artistic materials. , 2010, Accounts of chemical research.