Flow injectionluminol-based chemiluminescence method as optimized in Fe(Ⅱ) analysis of seawater

The determination method of dissolved Fe (Ⅱ) in seawater was studied based on luminol chemiluminescence in this paper.MOPS (3-(N-morpholino) propanesulfonic acid) was used as buffer to suppress Fe (Ⅱ) oxidation, at the same time, factors that may influence the sensitivity of Fe (Ⅱ) determination, such as the concentrations of MOPS and luminol, buffering pH, pump rate and integration time were studied.It demonstrated that the sensitivity was greatly enhanced by the addition of MOPS.In addition, optional conditions of pH=7.2, 2 mmol/L MOPS, 1 mmol/L luminol, 3 mL/min pump rate and 200 ms integration time, are used to determine trace amount Fe (Ⅱ) in the coastal seawater of China.Using the East China Sea water as blank water, the limit of detection is 116 pmol/L Fe (Ⅱ), and the measurement range is 0.116~150 nmol/L.