Development of standard materials for nitrate nitrogen solution in water

[ China Instrument Network Instrument R&D ] On December 7, 2018, the standard substance of water nitrate nitrogen solution developed by Gansu Provincial Metrology Research Institute and National Defense Science and Technology Industrial Applied Chemistry First-class Metering Station was reviewed by National Standard Reference Substances in Beijing. It will be approved and approved as a national secondary standard substance.

Nitrate nitrogen in water is the monitoring parameter in GB 5749-2006 "Sanitary Standard for Drinking Water" and is an important indicator for monitoring the pollution of lakes and reservoirs. In recent years, the eutrophication of reservoirs and lakes in China is quite serious. According to statistics, about 80% of the lakes and reservoirs are in the middle and eutrophic level. The eutrophication of the lake library often causes the blue-green algae to multiply in the water body, and the phytoplankton body increases sharply, causing frequent occurrence of “water blooms” and deteriorating water quality, causing the water body to lose its proper water resources function and restricting the local social and economic development. . At present, the method for monitoring nitrate nitrogen content is mainly by using ion chromatography, spectrophotometry and other analytical methods. In order to ensure the accurate and reliable monitoring results of nitrate nitrogen value, in addition to having good analytical instruments, it is more important to have quality control of the accuracy and reliability of analytical instruments and analytical methods by standard materials with similar matrix and accurate values. And magnitude traceability.

The preparation of standard materials for nitrate nitrogen solution in water is based on JJF1006-1994 "Technical Specifications for Primary Standard Substances" and Standard Substances Management Measures. In principle, technical indicators are in accordance with the "Measurement and Authorized Production Methods for Primary Standard Substances" issued by the National Metrology Department. The development of the reference material is based on the basis. In this collaborative research and development process of reference materials, Gansu Metrology Institute has undertaken key technical tasks such as uniformity testing, fixed value analysis and uncertainty assessment, and plays a vital role in the development of standard materials.

The successful development of this standard material not only meets the traceability requirements of the environment, health and commodity inspection, but also provides verification means for the technical methods of inspection and identification in related fields, and also provides technical results for reliability and comparability of inspection and testing of similar substrates. support. It not only fills the gap in the development of standard materials in Gansu Province, but also plays an important role in protecting people's lives and health.

(Original title: The development of standard substances for nitrate nitrogen solution in water has obtained the national secondary standard substance)