Analytical properties of 5-methylfuran-2-carbaxaldehyde thiosemicarbazone: extractive second derivative spectrophotometric determination of Cd(II) in medicinal leaves, environmental and biological samples

摘要

5-methylfuran-2-carbaxaldehyde thiosemicarbazone (5-MFAT )is proposed as a new sensitive and selective analytical reagent for extractive spectrophotometric determination of trace amounts of cadmium (II). 5-MFAT reacts with cadmium(II) to give a light yellow colored complex in a sodium acetate and acetic acid buffer of pH=6.0. The color reaction has been investigated in detail. This complex is easily extracted into isoamylalcohol with a 1:2 composition and has maximum absorbance at 360 nm. The molar absorptivity and Sandell’s sensitivity are found to be 3.7x104 l mol-I cm-I, and 0.0029 μgcm-2 respectively. The interference of various diverse ions has also been studied. The method has been successfully applied for the extractive second derivative spectrophotometric determination of trace amounts of Cd(II) in several standard reference materials such as medicinal leaves, leafy vegetables, biological, water and soil samples.