磷是水体中必须的营养元素之一。海洋中浮游生物等的自养生物通过日光作用摄取这些营养物质变为自身的体内组织,而鱼类则多以这些自养生物为食料。无论海洋或陆上各种水源,往往受到工业废水或生活污水等的污染,可能导致局部磷酸盐含量过高,使水质恶化,以致影响水体中的生态平衡。由于天然水中磷酸盐含量一般甚微,需用灵敏的方法监测。钼蓝比色法目前作为标准方 Phosphorus is one of the necessary nutrients in water. Autotrophs, such as plankton in the ocean, absorb these nutrients into their own body tissues through the action of sunlight, while fish are mostly fed on these autotrophs. It is often contaminated by industrial wastewater or domestic sewage, regardless of the sea or land water sources. It may lead to excessive local phosphate content and deterioration of water quality, thus affecting the ecological balance in water bodies. Due to the generally negligible phosphate content in natural waters, sensitive methods should be used. Molybdenum blue colorimetric method is currently the standard side