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Sustainable Development 可持续发展, 2011, 1, 59-64 /10.12677/sd.2011.12010 Published Online July 2011 (/journal/sd/) The Non-negligible Phosphorus Form—Reduced Phosphorus in Water# * Hongjun Wang, Ruixiang Cao, Juan Zhang, Chao Han, Xueyuan Gu, Jinju Geng , Xiaorong Wang, Xin Qian State Key Laboratory of Pollution Control and Resources Reuse, School of Environment, Nanjing University, Nanjing Email: wanghongjun2258@126.com; jjgeng@ Received: May 6th, 2011; revised: Jun. 17th, 2011; accepted: Jun. 28th, 2011. Abstract: Reduced phosphorus compounds, such as phosphite ( H PO and HPO2 ,+3), hypophosphite 2 3 3 ( H PO ,+1), and phosphine (PH ,–3), have long been neglected in the phosphorus geochemical cycle. Re- 2 2 3 cently reduced phosphorus compounds have been detected in many environmental sites. Their role in the phosphorus cycle is becoming a hot study spot. However, their complex environmental behavior makes a headache for many researchers due to such characteristics as the specific chemical characteristics, such as the thermo dynamical instability, kinetic stability and vast water-solubility, of the reduced phosphorus com- pounds induce their complicated environmental behavior and fate. This paper reviewed the sources and dis- tribution, migration and transformation, and bioavailability of reduced phosphorus compounds in aquatic wa- ter environment. Also, analytical methods of reduced phosphorus compoun