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以少量聚磷酸盐如六偏磷酸钠等和更少量的有机磷酸盐如羟基乙叉二膦酸等组成的磷系水质稳定剂配方,由于污染少,对循环冷却水系统消垢缓蚀效果好,因此已被国内外各大型石油化工厂广泛地应用。为了及时控制磷酸盐的加入量,准确测定它们的含量是很重要的。通常测定聚磷酸盐的分析方法,均先加热解聚为正磷酸盐后,再以磷钼兰或磷钼钒酸形式进行比色测定,但加热解聚时间长,结果也不稳定。自七十年代我国引进十三套大化肥厂后,美国贝兹(Betz)公司推荐的测定磷酸盐的方法与上述方法相比,具有快速、重现
With a small amount of polyphosphates such as sodium hexametaphosphate, etc., and smaller amounts of organic phosphate such as hydroxyethyl diphosphonic acid and other components of the phosphorus-based water stabilizer formulations, due to less pollution, the cooling water system, anti-fouling and corrosion inhibition effect is good , So it has been widely used in large-scale petrochemical plants both at home and abroad. In order to control the amount of phosphate added in time, it is important to accurately determine their content. Usually measured polyphosphate analysis methods, are first heated to depolymerase orthophosphate, and then phosphomolybdenum or phosphomolybdic acid colorimetric determination of the form, but the heating depolymerization for a long time, the results are not stable. Since the introduction of thirteen large-scale fertilizer plants in China in the 1970s, the method recommended by the U.S. company Betz for the determination of phosphates has been shown to be rapid and reproducible