Atomic absorption spectrophotometric microdetermination of total mercury in undigested biological samples
The influence of reaction time upon stannous (II) chloride as a reductant in the cold-vapor atomic absorption spectrophotometric method was investigated. In this comparative study, virtually all operating conditions, including volumes and chemicals used, were made identical except for the redesigning of the reaction vessels. The use of a reaction mixing time of 2 minutes (TR method), rather than immediate bubbling with aspiration (IL method) of total mercury from undigested biological samples, has several advantages. There is an average 4.5-fold increase in sensitivity of peak height readings virtually no loss of mercury vapor from the reaction vessel by diffusion. Using the TR method also eliminated interaction of mercury with the matrices investigated, viz., undigested blood, undigested saliva, undigested urine, and digested hair samples. The average recovery for the TR method was superior to the IL method, 99.3 +/- 3.2% vs 84.7 +/- 3.3%, rho <0.05. In addition, mercury concentrations determined with the TR method were identical using either peak or peak height readings. It was also found that concentrations determined using either the formulas given by Magos and Clarkson and Farant et al. or an aqueous calibration curve were equivalent. Only 0.2 - 1.0 mL of biological sample was needed for each analysis in the study.
- Research Organization:
- National Univ. of Singapore
- OSTI ID:
- 6686822
- Journal Information:
- J. Anal. Toxicol.; (United States), Journal Name: J. Anal. Toxicol.; (United States) Vol. 12:3; ISSN JATOD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ABSORPTION SPECTROSCOPY
BIOLOGICAL ACCUMULATION
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BLOOD
BODY
BODY FLUIDS
ELEMENTS
HAIR
MATERIALS
MERCURY
METABOLISM
METALS
ORGANS
SALIVA
SKIN
SPECTROSCOPY
URINE
WASTES