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ISO 16094-2:2025 Is Not Directly Applicable to Intact-Liquid Microplastic/Nanoplastic Field Measurement (EcoExposure™): Scope of Vibrational Spectroscopy Laboratory Methods for Clean Waters
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A new international standard for testing microplastics in drinking water only covers one specific lab method (using microscopes plus light-based chemical analysis) and only detects particles roughly 1 micrometer or larger, meaning it misses smaller nanoplastics that may be more easily absorbed by the body. This matters because it shows there's still no single "gold standard" test that captures the full picture of plastic contamination in water, so consumers should be cautious about assuming any one test result tells the whole story of their exposure.
ISO 16094-2:2025 establishes principles for analyzing microplastics in drinking water and other low-suspended-solids waters using microscopy coupled with vibrational spectroscopy, principally FTIR and Raman. The standard addresses particle sizing, counting, and polymer identification within an approximately 1–5,000 µm range and therefore represents a specific particle-resolved laboratory analytical architecture rather than a universal framework for plastic measurement. Its scope does not encompass much of the nanoplastic size regime or intact-liquid field measurement, in which the primary analysis occurs at or near the point of collection. EcoExposure™ Water is being developed under this latter architecture for total plastic burden, including microplastics, nanoplastics, and mixed MP+NP samples. Development testing has included drinking water across multiple countries and diverse marine, river, DOM-rich, and mineral-rich matrices, as well as progressive-filtration studies demonstrating distinguishable optical behavior among visually similar drinking-water samples. This technical note explains why ISO 16094-2:2025 is not directly applicable as the primary analytical standard for EcoExposure™, while remaining relevant to complementary particle-resolved laboratory characterization using FTIR and Raman spectroscopy. Figure 1. ISO 16094-2:2025 Covers One Branch of the Broader Microplastics Lab-Based Analytical Landscape The standard applies principally to particle-resolved FTIR and Raman vibrational spectroscopy, while other widely used research laboratory approaches—including Py-GC/MS, TED-GC/MS, fluorescence microscopy, and electron microscopy—operate under different analytical principles and fall outside its scope. These methods can measure fundamentally different endpoints, including particle number, size, polymer identity, morphology, or polymer mass, and report results in non-interchangeable units. Thus, ISO 16094-2:2025 does not establish a universal laboratory method for microplastics analysis, and no single laboratory technique currently serves as a comprehensive reference standard across the field.
More Papers Like This
ISO 16094-2:2025 Is Not Directly Applicable to Intact-Liquid Microplastic/Nanoplastic Field Measurement (EcoExposure™): Scope of Vibrational Spectroscopy Laboratory Methods for Clean Waters
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A new international standard (ISO 16094-2:2025) for testing microplastics in drinking water only covers one type of lab testing method and only catches plastic particles down to a certain size, meaning it misses many of the smallest nanoplastics that could be relevant to human health. This paper argues that a newer field-testing approach called EcoExposure™, designed to measure total plastic exposure (including tinier nanoplastics) right where water samples are collected, isn't the same thing and shouldn't be judged by this lab-based standard. The takeaway: there's still no single "gold standard" test that captures the full range of plastic contamination in the
ISO 5667-27:2025 Is Not Directly Applicable to Intact-Liquid Field Measurement (EcoExposureTM): The Role of Filtration for Laboratory-Sampling in Microplastics / Nanoplastics Analysis
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This paper is a technical explainer, not a health study, it clarifies that a new international standard for collecting water samples to test for microplastics doesn't apply to a different type of tool (EcoExposure™) that measures microplastics directly in water on the spot, without filtering out particles first. Why it matters: as tools for detecting microplastics in our water become more common, it's important that testing methods are matched to the right technology, so results people rely on to understand their exposure are actually accurate and trustworthy.
ISO 5667-27:2025 Is Not Directly Applicable to Intact-Liquid Field Measurement (EcoExposureTM): The Role of Filtration for Laboratory-Sampling in Microplastics / Nanoplastics Analysis
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A new technical note clarifies that a recently updated international standard for testing water for microplastics (tiny plastic particles) doesn't apply to newer field-testing devices, like EcoExposure™ Water, that measure plastic particles right on the spot instead of filtering samples and sending them to a lab. This matters because as portable microplastics-testing tools become more common, we need clear rules about which methods they should follow, otherwise results from different tools might not be comparable, making it harder to know how much plastic contamination is actually in our water and what that means for our health.
Review of Microplastic and Nanoplastic Validation Efforts in 2026: ISO Principles, Reference Materials Development: Comparison of Conventional Laboratory Methods with EcoExposure™
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This review looked at how scientists currently measure microplastics and even tinier nanoplastics in water, and found there's no single agreed-upon "gold standard" test, different methods measure different things, use different units, and often struggle with real-world plastic fragments that are messy and weathered rather than perfectly round test particles. This matters because it means when you see a headline about "how much microplastic" is in water or food, that number depends heavily on which test was used, and truly standardized, universally trusted testing methods are still years away (experts estimate around 2030 or later).
Review of Microplastic and Nanoplastic Validation Efforts in 2026: ISO Principles, Reference Materials Development: Comparison of Conventional Laboratory Methods with EcoExposure™
AI summary Read the abstract
This review looked at how scientists currently test for microplastics and nanoplastics (tiny plastic particles) in water and found there's no single agreed-upon "gold standard" method, different tools measure different things and often give different results, even in the same lab. That matters because it's hard to know how much plastic we're really exposed to in our water until testing methods become more standardized, which researchers estimate could take until 2030 or later.
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