Ultratrace Determination of Metals with Dithizone by Thermal Lens Spectrophotometry

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Abstract:

A pump-probe thermal lens instrument was constructed, evaluated, and applied to the determination of metals after extraction with dithizone in carbon tetrachloride. An argon-ion laser operated at 514.5 nm, with a power of just 22 mW at the cuvette position and chopped at 2 Hz, and a He-Ne laser were used as a pump and probe, respectively. The thermal lens effect was measured by a pinhole-photodiode and a lock-in amplifier. Evaluation of the setup with an iodine solution in carbon tetrachloride gave a minimum detectable absorbance of 5 × 10−6(S/N = 3), the upper limit of the dynamic range being 5.7 × 10−3. Relative standard deviation was about 3%. Calibration curves and limits of detection for several metal dithizonates were obtained. From extractions of cadmium dithizonate at concentrations lower than 2 ng mL−1, a LOD of 8 pg mL−1, corresponding to an absolute LOD of 4 fg of cadmium in the probe volume, was achieved.

Keywords: Dithizone; Laser spectroscopy; Metal complexes; Thermal lens; Ultratrace determination

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702884428167

Affiliations: 1: Department of Chemistry, University of Florida, Gainesville, Florida 32611; on leave from Department of Analytical Chemistry, University of Valencia, 46100 Burjasot, Valencia, Spain 2: Department of Chemistry, University of Florida, Gainesville, Florida 32611 3: Department of Chemistry, University of Florida, Gainesville, Florida 32611; present address: CCR, European Community Center, Ispra (Varese), Italy

Publication date: February 1, 1988

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