Ca^(2+)/Mg^(2+)/Zn^(2+)在水溶性聚磷酸铵溶液中的螯合作用  

Study on the Chelation of Ca^(2+)/Mg^(2+)/Zn^(2+) in Water-Soluble Ammonium Polyphosphate Solution

作　　者：汪玉梅 许德华 王辛龙 杨晶旭 张志业 Wang Yumei;Xu Dehua;Wang Xinlong;Yang Jingxu;Zhang Zhiye(Ministry of Education Research Center for Comprehensive Utilization and Clean Processing Engineering of Phosphorus Resources,College of Chemical Engineering,Sichuan University,Chengdu,610065)

机构地区：[1]四川大学化学工程学院教育部磷资源综合利用与清洁加工工程研究中心,成都610065

出　　处：《化学通报》2022年第6期704-708,共5页Chemistry

基　　金：国家自然科学基金项目(32172677)资助。

摘　　要：近年来,水溶性聚磷酸铵在液体肥料领域受到了广泛的关注,并在发达国家中得到了大面积的推广及应用。本文采用动态法研究在pH 5.5~8.0、温度278.15~323.15 K条件下Ca^(2+)/Mg^(2+)/Zn^(2+)在聚磷酸铵溶液中的螯合规律。实验结果表明,相同质量分数的聚磷酸铵溶液对金属离子的螯合量会随溶液中Ca^(2+)、Mg^(2+)、Zn^(2+)浓度的变化而改变,螯合量随温度的升高而逐渐降低,随pH的增加而逐渐增加,随聚合度的升高而逐渐增加。采用X射线衍射仪、傅里叶变换红外光谱和扫描电镜对聚磷酸铵和反应后的聚磷酸铵进行了表征。In recent years, water-soluble ammonium polyphosphate has been widely concerned in the field of liquid fertilizer and promoted and used in developed countries. The chelation of Ca^(2+)/Mg^(2+)/Zn^(2+)in ammonium polyphosphate solution was investigated by dynamic method at temperature ranging from 278.15 to 323.15 K and at pH value ranging from 5.5 to 8.0. The results showed that the chelating amount of the same mass percent of ammonium polyphosphates to metal ions would change with the change of the concentration of Ca^(2+), Mg^(2+)and Zn^(2+)in the solution. The chelating amount of ammonium polyphosphate decreased with the increase of temperature and gradually increased with the increase of pH value. The chelating amount gradually increased with the increase of degree of polymerization. The ammonium polyphosphate before and after the reaction were characterized by X-ray diffraction analysis(XRD)、Fourier transform infrared spectroscopy(FTIR) and scanning electron microscope(SEM-EDS).

关 键 词：Ca^(2+)/Mg^(2+)/Zn^(2+) 聚磷酸铵 螯合 

分 类 号：TQ449.6[化学工程—化学肥料工业]