GB/T 41222-2021 Soil quality—Method for monitoring the farmland surface runoff

GB/T 5750.5-2006 Standard examination methods for drinking water—Nonmetal parameters GB/T 5750.5-2023 Standard examination methods for drinking water—Part 5:Inorganic nonmetallic indices GB/T 11893-1989 Water quality—Determination of total phosphorus— Ammonium molybdate spectrophotometric method GB 17378.4-1998 The specification for marine monitoring Part 4:Seawater analysis GB 17378.4-2007 The specification for marine monitoring—Part 4:Seawater analysis HJ 493-2009 Water quality: Sample preservation and management technical regulations HJ 632-2011 Soil determination of total phosphorus by alkali fusion-molybdenum antimony spectrophotometry HJ 636-2012 Water quality determination of total nitrogen by alkaline potassium persulfate digestion and UV spectrophotometry HJ 665-2013 Water quality: Determination of ammonia nitrogen by continuous flow-salicylate spectrophotometry HJ 667-2013 HJ 667-2013 Water quality determination of total nitrogen: Continuous flow-Naphthalene-2,3-dichloronaphthalene spectrophotometric method HJ 670-2013 Water quality: Determination of Phosphorus and Total Phosphorus by Continuous Flow-Ammonium Molybdate Spectrophotometry NY/T 1121.24-2012 Soil testing Part 24: Determination of Total Nitrogen in Soil using Automatic Nitrogen Analyzer SL/T 21-2015 SL/T 21-2015 Standard for Observing Precipitation Amount SL 21-2006 Rainfall Observation Standards SL 342-2006 SL 342-2006 General Technical Requirements for Soil and Water Conservation Monitoring Facilities SL 21-1990 Rainfall Observation Standards (SL 21-1990) HJ/T 346-2007 Water quality-Determination of nitrate-nitrogen-Ultraviolet spectrophotometry GB 3838-2002 Environmental quality standards for surface water GB/T 50476-2019 Code for durability design of concrete structures