抄録
A Visual determination based on ON/OFF color reaction is high visibility visual analysis because of determination by counting number of discoloring. On the other hand, there is some problems about operability in this method . Especially, there were necessary to large number of dispensing of reagents and sample. For this reason, original analytical device was made and their properties were examined in this study. As a result, one step visual analysis by counting number of discoloring was realized. Some solutions containing F- ion were simply determined in the concentration range of 0.8 to 6 ppm within few seconds.
