Sequential flow-injection determinations of calcium and magnesium in waters |
| |
| Authors: | J Alonso J Bartroli JLFC Lima AASC Machado |
| |
| Institution: | Department de Química Analítica, Facultad de Ciencias, Universitat Autònoma de Barcelona, Bellaterra, Barcelona Spain;Departamento de Química, Faculdade de Ci?ncias, Universidade do Porto, 4000 Porto Portugal |
| |
| Abstract: | A tubular PVC membrane electrode for calcium without inner reference solution and a device for location of the reference electrode are described. In the flow-injection system, calcium is determined potentiometrically and then magnesium is determined by atomic absorption spectrometry. The electrode provides linear response to calcium in the range 5 × 10?5/2-10?1 M. On-line dilution of the sample allows magnesium determination in the range 0/2-10 mg l?. Flow rates between 3 and 6 ml min?1 are possible. The sampling frequency is 60/2-90 h?1. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
