Determination of cerium (IV) by continuous flow injection and sequential flow injection methods

The research aims to design a new flow injection system using the two continuous and successive techniques for the determination of cerium quaternary, through the interaction of cerium quaternary with potassium iodide in an acidic medium and the liberation of yellow-colored iodine, which gives a maximum absorption peak at the wavelength is 353 nm. The method includes manufacturing a quadruple valve from cheap materials and choosing the optimal system design with studying the optimal conditions for the system, which include potassium iodide concentration, acid concentration, Pump speed, acid volume, pattern size, reaction profile length, then designing a new sequential injection system and selecting the optimal design for it. The flow injection method yielded compliance with Beer-Lambert law in the range (1-40 mg/L). And a correlation coefficient (R2) of 0.997, and a dilution coefficient equal to 1.33 and 1.32 for concentrations of 10 and 30 mg / L, respectively. The sequential injection method also gave a clear improvement in the height of the apex and an increase in sensitivity.