Stability of complex of L-threonic acid with lanthanum(III)neodymium(III) and samarium(III)

Objective To study the stability of complex of L-threonic acid with lanthanum(Ⅲ)[La(Ⅲ)]、neodymium(Ⅲ)[Nd(Ⅲ)] and Samarium(Ⅲ)[Sm(Ⅲ)]. Method The complex formation of L-threonic acid with La(Ⅲ),Nd(Ⅲ) and Sm(Ⅲ) were determined with the way of pH potential titration at I=0.1mol·L -1 ,25±0.1℃. Results The complex formation constant of L-threonic acid with La(Ⅲ),Nd(Ⅲ)and Sm(Ⅲ) were La(Ⅲ)2.62(110),5.23(12…