节点文献
离子选择电极法测定N,N—二甲基膦酸基甘氨酸与钙的络合物组成和稳定常数
WITH ION SELECTIVE ELECTRODES DETERMINATING THE COMPOSITION AND STABILITY CONSTANTS OF Ca-N,N-BIS(PHOSPHONOMETHYL)GLYCINE COMPLEXES
【摘要】 <正> N,N—二甲基膦酸基甘氨酸[N,N—Bis(pheosphonomethyl)glycine,以下简称NBPG]结构式为在农业上作为植物生长调节剂,有明显的增糖增产作用。从化学结构上看,又是很好的络合剂。B.BynozkuHa等人曾研究过与Fe3+、Mn2+、Pb2+的络合反应。本文用钙离子选择电极法测定了NBPG与Ca2+生成络合物的组成和稳定常数;同时测定了NBPG的各级电离常数,为NBPG的开发应用奠定基础。
【Abstract】 The electric dissociation constants of N,N-Bis(phosphonomethyl)glycine (NBPG,H5L) were determined as pKa1 1. 75 ± 0. 02, pKa2 2. 04 ± 0. 01, pKa3 5. 08 ± 0. 02, pKa4 6. 38 ± 0. 01, pKa5 10. 76±0. 03,determination being carried cut by pH-potentiometry descibed in the paper. The composition and stability constants of Ca-NBPG were CaL 6. 41±0. 01, CaHL 3. 06±0. 01 (NaNO3 0. 1mol·l-1, 18℃, as determined with ion selective electrodes.
- 【文献出处】 化学研究与应用 ,Chemical Research and Application , 编辑部邮箱 ,1993年01期
- 【被引频次】1
- 【下载频次】60