Skip to main content

Ultratrace Determination of Metals with Dithizone by Thermal Lens Spectrophotometry

Buy Article:

$29.00 plus tax (Refund Policy)


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


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

More about this publication?

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more