1. 1) U.S. Environmental Protection Agency Office of Water, Office of Science and Technology: "Aquatic life ambient water quality criteria for ammonia–Freshwater", Washington, DC (2013)
2. 2) Boyd, C.E. and Pillai, V.K.: Water quality management in aquaculture, CMFRI Special Publication, No.22 (1984)
3. 3) Haynes, W.M.: "Handbook of chemistry and physics, 94th Edition 2013-2014", CRC Press, Boca Raton (2013)
4. 4) The Japanese Industrial Standards, JIS K 0102: 2019
5. 5) Hu, X., Takenaka, N., Takasuna, S., Kitano, M., Bandow, H., Maeda, Y. and Hattori, M.: Determination of ammonium ion in rainwater and fogwater by flow injection analysis with chemiluminescence detection. Anal. Chem., 65, 3489-3492 (1993)