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Turbidimetric determination of sulphate in waters employing flow injection and lead sulphate formation |
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| Authors: | Ricardo Erthal Santelli, Paulo Roberto Salgado Lopes, Regina C lia Leme Santelli,Angela De Luca Rebello Wagener |
| Affiliation: | a Geochemistry Department, Federal Fluminense University, Niterói, RJ-24020-007, Brazil b Chemistry Department, Pontificia Universidade Católica do Rio de Janeiro, Rio de Janeiro 22453-900, Brazil |
| Abstract: | An analytical flow-injection procedure based on PbSO4 colloidal formation is proposed as a turbidimetric determination of sulphate in natural waters. Ethanol-water was used as a medium in order to improve the sensibility of the method. Both chemical and flow variables as well as interfering species were studied. A detection limit of 0.3 μg SO2−4 ml−1 was found, and the analytical range (according to Beer's law) was 2–20 μg SO2−4 ml−1. The precision was better than 3% R.S.D. and the sample throughput was ca. 35 h−1. The method, when compared with a standard methodology, gave good results when applied to water analysis. |
| Keywords: | Flow injection Turbidimetry Sulphate Waters |
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