A Rapid and Simple Spectrophotometric Determination of Traces of Chromium (VI) in Waste Water Samples and in Soil samples by using 2-Hydroxy, 3-Methoxy Benzaldehyde Thiosemicarbazone (HMBATSC)
A rapid and simple Spectrophotmetric method has been developed for the determination of microgram amount of Chromium (VI) in aqueous dimethyl formamide (DMF). Chromium (VI) forms a yellowish green coloured M:L complex with 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone in the acidic buffer medium (pH=6.0) at room temperature. The complex shows maximum absorption at 385nm. Beer's law is obeyed in the range 0.260 to 2.60 
Analytical applications of thiosemicarbazones and semicarbazones
Abstract The analytical applications of thiosemicarbazones and semicarbazones in spectrophotometry, fluorometry, and atomic absorption spectrophotometry and as indicators have been reviewed (from January 1982 to November 1987). An account of the reagents has been given in this review and the reagents have been described in alphabetic order; all relevant data together with references are cited at the end.
Cyclopentane-1,3-dione bis (4-methylthiosemicarbazone) monohydrochloride as a spectrophotometric reagent for the determination of bromate in perchloric acid medium
Abstract Cyclopentane-1,3-dione bis (4-methylthiosemicarbazone) monohydrochloride produces coloured solutions with bromate ions in perchloric acid medium. The yellow colour obtained (molar absorptivity 1.8×104 1.mol−1.cm−1 at a wavelength of 400 mm) has been used for the spectrophotometric determination of trace amounts of bromate.