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On December 7, 2018, the water nitrate nitrogen solution standard substance, developed by the Gansu Provincial Metrology Research Institute and the National Defense Science and Technology Industrial Applied Chemistry First-Class Metrology Station, underwent a review by the National Standard Reference Substances in Beijing. It was officially approved as a national secondary standard substance, marking a significant achievement in China’s metrology field.
Nitrate nitrogen is a critical parameter in GB 5749-2006, the Sanitary Standard for Drinking Water, and plays a key role in monitoring the pollution levels of lakes and reservoirs. In recent years, eutrophication has become a major environmental issue in China, with approximately 80% of lakes and reservoirs classified as moderately or highly eutrophic. This condition often leads to the rapid growth of blue-green algae and phytoplankton, resulting in frequent "water blooms" that degrade water quality and impair the function of water resources. These issues hinder local economic development and threaten public health.
Currently, the primary methods for measuring nitrate nitrogen include ion chromatography and spectrophotometry. To ensure accurate and reliable results, it's essential not only to use high-quality instruments but also to rely on standard materials that match the sample matrix and have known, traceable values. These materials are crucial for calibrating equipment and validating analytical procedures.
The preparation of this nitrate nitrogen standard solution followed the technical specifications outlined in JJF1006-1994 and the Standard Substances Management Measures. The project adhered to the guidelines issued by the National Metrology Department, ensuring high standards of accuracy and reliability. During the collaborative development process, the Gansu Metrology Institute played a central role, undertaking key tasks such as uniformity testing, value assignment, and uncertainty analysis.
This successful development fills a gap in the standard material supply within Gansu Province and provides a vital reference for environmental monitoring, public health, and commodity inspection. It supports the accuracy, consistency, and comparability of testing across various fields, contributing to better decision-making and improved safety for communities. Overall, the creation of this national secondary standard substance represents a major step forward in China’s efforts to enhance scientific measurement and environmental protection.