Analytical laboratories need to possess the necessary skills and expertise to perform measurements that are accredited in accordance with ISO or other relevant quality standards. Inter-laboratory comparison is an effective way to improve the quality control system for analytical laboratories using external measures, which has become increasingly important for analytical laboratories in today's globalized economy. 

This is the fourth round of the study on water quality analysis in countries along the Belt-and-Road, jointly organized by Water Quality Analysis Laboratory and CAS-TWAS Centre of Excellence for Water and Environment (CAS-TWAS CEWE), both affiliated with the Research Center for Eco-environmental Sciences (RCEES), Chinese Academy of Sciences (CAS).The main objective of the activity is to assess the laboratory reproducibility in water quality analysis and provide a QA/QC tool for  each participating laboratory to improve their performance.

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Report of the Inter-laboratory Comparison on Arsenic and Ammonia Nitrogen Determination in Water (2022).pdf