What is EN ISO 21461:2018?

EN ISO 21461:2018 is a technical standard that provides guidelines for the analysis of water samples using solid-phase microextraction (SPME) and gas chromatography-mass spectrometry (GC-MS). This method is widely used in environmental monitoring and assessment, as it allows for the detection and quantification of various organic compounds present in water samples.

Why is it important?

The analysis of water samples plays a crucial role in ensuring the safety and quality of drinking water, as well as in assessing the impact of human activities on aquatic ecosystems. By utilizing SPME and GC-MS, EN ISO 21461:2018 offers a reliable and efficient approach for identifying and measuring organic contaminants in water, including pesticides, industrial chemicals, and pharmaceutical residues.

How does it work?

The first step in the analysis process is the extraction of organic compounds from the water sample using SPME. This technique involves exposing a specially coated fiber to the sample, allowing the target analytes to be absorbed onto the fiber's coating. After extraction, the fiber is introduced into the GC-MS instrument, where the captured compounds are thermally desorbed and separated by gas chromatography. The compounds are then ionized and detected by mass spectrometry, providing information about their identity and concentration.

Benefits and limitations

EN ISO 21461:2018 offers several advantages over traditional methods of water analysis. It enables rapid analysis with high sensitivity and selectivity, requiring minimal sample volume. Additionally, it allows for the simultaneous determination of multiple compounds in a single run. However, it is important to note that this method requires specialized equipment and trained personnel. Furthermore, some compounds may not be amenable to analysis by SPME and GC-MS, necessitating the use of alternative techniques.