determination of cobalt ions from the environmental samples using il-zif(8) followed by atomic absorption spectrometry

Cobalt is widely used in various industries as alloys, catalysts, batteries, paints, drugs and ceramics, but at the same time, it is a significant pollutant of the environment because of its toxic effect on human health. cobalt is a typical metal ion present in biological and environmental samples and has important roles in many physiological functions. however, at high levels, it can be toxic and can lead to toxic effects such as vasodilatation, cardiomyopathy, low blood pressure, and bone defects in humans and animals [1,2]. therefore, the development of efficient, reliable determination methods for monitoring the level of cobalt concentration in natural waters is required. however, the determination of trace cobalt in biological and environmental samples is very difficult due to its extremely low concentration and the interfering effects of the matrix. several methods have been reported for the separation and preconcentration of cobalt. a vortex-assisted dispersive solid-phase microextraction (va-d-μ-spe) method for separation and preconcentration of cobalt ions using il-zif (8) prior to measurement by flame atomic absorption spectrometry was developed. key parameters influencing the extraction efficiency of cobalt were examined and optimized. the optimum conditions for this method were: ph of solution: 7, vortex mixing time for sorption: 2 minutes, amount of adsorbent, 10 mg, concentration of analyte 0.5 ppm; type and concentration of eluent, hcl and 0.01 mol l-1, volume of eluent: 4ml; the limit of detection and relative standard deviation for the detection of cobalt ions were found to be 2.42 ppb and 0.75%, respectively. finally, the developed method was successfully used for extraction and determination of cobalt ions in water, vegetable, and soil samples.