Quality Assurance, Chemometrics, Traceability and Metrological Chemistry

Quality assurance in the chemical and allied sciences hinges upon the rigour of measurement processes, the judicious design and validation of analytical methods, and the integrity of data produced throughout the life cycle of products and processes. Chemometrics provides a mathematical framework to extract meaningful patterns from complex, multivariate data—encompassing instrument signals, process monitoring streams and composition profiles—to support method optimisation, process control and classification tasks. Traceability links every reported result to an unbroken chain of calibrations or reference materials, anchored in the International System of Units and maintained by national metrology institutes. Metrological chemistry extends these principles to the realm of chemical composition and structure, realising measurement standards for purity, concentration and functional performance of materials. In practice, reference materials underlie method validation and control charts, while statistical design of experiments, multivariate calibration and classification models underpin robust method development. Together, these pillars form the backbone of a reliable quality infrastructure that safeguards product compliance, informs regulatory decisions and enables fair trade worldwide.

Research from Nature Portfolio

Advances in metrology have been demonstrated by new methods that extend the capabilities of conventional imaging and weighing systems. A novel table-top interferometric device has been introduced for in-process diameter monitoring of precision spheres, achieving sub-nanometre resolution in mere minutes and offering a practical route to realise the kilogram via Kibble balance experiments without bespoke infrastructure. In another study, direct measurements of the diamagnetic force effect on Kibble balance coils have resolved a long-standing paradox, confirming that symmetry between weighing and velocity modes is preserved to within parts in 10⁻⁹—thereby reinforcing the traceability of mass to the Planck constant. Finally, a marker-based protocol has been shown to convert standard two-dimensional X-ray radiography setups in museums into three-dimensional CT imagers, highlighting how algorithmic innovations can democratise nondestructive testing and spatial metrology for cultural heritage without new hardware.

Quality Assurance, Chemometrics, Traceability and Metrological Chemistry publication trend

The graph below shows the total number of articles in quality assurance, chemometrics, traceability and metrological chemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Quality assurance: Systematic actions—including method validation, proficiency testing and control charts—designed to ensure that products and services meet specified requirements.

Chemometrics: The application of multivariate statistical and mathematical methods to design experiments, preprocess data, and build calibration and classification models from chemical measurements.

Traceability: The property of measurement results whereby they can be related to reference standards—SI units or certified reference materials—through an unbroken chain of calibrations, each contributing to the associated measurement uncertainty.

Metrological chemistry: The science of chemical measurement standards, encompassing the development and use of reference materials and protocols to realise quantitative and structural chemical properties with known uncertainties.

Certified reference material (CRM): A reference material characterised by a metrologically valid procedure for specified properties, accompanied by a certificate providing values, associated uncertainties and traceability statements.

Design of experiments (DoE): Structured multivariate approaches—factorial, fractional or response-surface designs—used to optimise analytical and production processes by evaluating the effects and interactions of multiple variables.

References

1. Interferometric device for the in-process measurement of diameter variation in the manufacture of ultraprecise spheres. Measurement Science and Technology (2021).
2. Resolution of the paradox of the diamagnetic effect on the Kibble coil. Scientific Reports (2021).
3. Enabling 3D CT-scanning of cultural heritage objects using only in-house 2D X-ray equipment in museums. Nature Communications (2024).
4. A novel standard for forensic elemental profiling of polymers by LA-ICP-TOF-MS. Forensic Chemistry (2023).
5. Evaluating the strength of evidence of elemental profiling of polymers with LA-ICP-MS. Forensic Chemistry (2024).
6. Toward Developing TechniquesAgnostic Machine Learning Classification Models for Forensically Relevant Glass Fragments. Journal of Chemical Information and Modeling (2022).