Simultaneous separation and preconcentration of <scp>N</scp>i(<scp>II</scp>) and <scp>C</scp>u(<scp>II</scp>) ions by coprecipitation without any carrier element in some food and water samples

Abstract

Summary A simple and highly sensitive separation and preconcentration procedure, which has minimal impact on the environment, has been developed. The procedure is based on the carrier element‐free coprecipitation of N i( II ) and C u( II ) ions by using 2‐{4‐[2‐(1H‐Indol‐3‐yl)ethyl]‐3‐(4‐chlorobenzyl)‐5‐oxo‐4,5‐dihydro‐1H‐1,2,4‐triazol‐1‐yl}‐ N ′‐(pyrrol‐2‐ylmethyliden)acetohydrazide ( ICOTPA ), as an organic coprecipitant. The levels of analyte ions were determined by flame atomic absorption spectrometry. The detection limits for N i( II ) and C u( II ) ions were found to be 0.27 and 0.58 μg L −1 , respectively, and the relative standard deviations for the analyte ions were lower than 4.0%. Spike tests and certified reference material analyses were performed to validate the method. The method was successfully applied for the determination of N i( II ) and C u( II ) ions levels in sea and stream water as liquid samples and red lentil and rice as solid samples.