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Determination of Zinc (II) Ion Using Dithizone by Flow Injection and Sequential Injection Techniques

Khdeeja Jabbar Ali and Marwa Raheem Kadoomm

This determinates Zinc (II) ion in variably samples by using methods flow injection and sequential injection systems which laboratory. The FIA and SIA systems depend on the base reaction of Zinc (II) ion with dithizone complex in aqueous phase in the presence of SDS anionic (sodium dodecyl sulphate) at pH=5 with absorption maximum at 565 nm. The factors (physical and chemical) effecting on the determination such as flow rats, reaction coil length, the volume of reagent (dithizone), the volume of sample, interference, the concentration of dithizone also. Attended the calibration curve and studied dispersion coefficient, reproducibility, application. Compared results methods FIA and SIA consecutively for determination of Zinc (II) by dithizone, the linear range was (2-10 mg/l), (1-15 mg/l), at sampling rate 70, 64 sample per hour, the detection limits (1.6746 mg/l), (0.1934 mg/l) for FIA and SIA respectively. Relative standard deviation for (10 mg/l), n=10 were found (0.8491 mg/l) for FIA and for SIA (0.5089 mg/l). Dispersion coefficient also has been studied in these methods.