2017 Volume 66 Issue 11 Pages 847-852
We have developed an automatic As analyzer (Flow Injection Analyzer (FIA)) in the smelting process drainage. An As molybdate complex was formed by reacting As and ammonium molybdate in the equipment route, and by using an UV–VIS Detector, an analytical system selective to As was constructed. An extensive smelting process In order to be compatible with the As concentration range in drainage, incorporates two kinds with different sampling amounts in the sampling valve. It also incorporates two liquid cells with different optical path lengths in a subsequent UV–VIS Detector. Quantitative measurements have been made possible even for a smelting process drainage with an As concentration of up to 3000 times different. A 10 mg L−1 standard solution was measured without maintenance for 1 month; the relative standard deviation (% RSD) of all measurements was 1.1 %, and the long-term stability of the developed device was confirmed. When applied to the smelting process drainage at our smelting site, it was confirmed that the drainage concentration of As could be measured in the range of 0.01 to 30 mg L−1. This equipment is already in operation at the actual smelting site, it is possible to operate with low running cost and long-term maintenance free.