ISSN:
1436-5073
Keywords:
Keywords. derivative spectrophotometry; rare earth determination; 6,8-fluoroquinolones; lomefloxacin.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract. The second derivative spectrophotometric method has been developed as a procedure for the determination of neodymium, holmium and erbium in mixed rare earths. It was found that the 1-ethyl-6, 8-difluoro-7-(3-methyl-1-piperazinyl)-4-oxo-1,4- dihydro-3-quinoline carboxylic acid forms stable complexes with neodymium, holmium and erbium ions in the pH 9.2–10.5 range. In the second derivative spectra the optimum analytical signals for neodymium, holmium and erbium are at 576.2 (+)−574.5 (−)nm, 444.2 (+) −447.8 (−)nm and 516.0 (+) −517.2(−)nm, respectively. Beer’s law is obeyed from 5.0×10−5 M to 2.5×10−4 M of neodymium, holmium and erbium. The quantification limits (10 Sb) were 1.2×10−5 M for Nd, 9.7×10−5 M for Ho and 3.0×10−6 M for Er.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00010069
Permalink