RADIOMETRIC TRACE ANALYSIS OF LEAD WITH DIETHYLDITHIOCARBAMATE AND $sup 204$Tl

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Analytica Chimica Acta (Netherlands)

DOI:https://doi.org/10.1016/S0003-2670(00)88345-2· OSTI ID:4800999

van Erkelens, P C

Two methods for the determlnatlon of submicrogram amounts of lead are described. Lead ls selectively extracted wlth carbon tetrachlorlde from an alkaline solutlon contalnlng excess dlethyldlthlocarbamate (DDC) and cyanlde. Traces of DDC are back-extracted. The lead ln the DDC complex ls exchanged with Tl and the amourt of Tl/54 ln the organlc layer acts as a measure for the lead. The llmit of sensitlvity ls 0.I ug; the standard devlatlon ls 11% (for 0.1 mu g). Bismuth and thallium interfere; thelr lnfluence can be accounted for with the help of EDTA, however. In the second method excess cyanlde ls added to the alkaline sample solution and lead ls exchanged selectively with Tl/sup 204/ by shaking with a CHCl/sub 3/ soIution contalning Tl/sup 204/(DDC)/sub 1/. As the process is not I00% effective (with a reasonable excess of the thallium complex) lsotope dllutlon with Pb/sup 210/ is also carried out. The amount of Tl/sup 204/ ln the aqueous layer acts as a measure for the exchanged Iead. The llmit of sensltlvity ls 0.05 mu g and the standard deviation is 12% (for 0.05 mu g). Blsmuth and thallium must be removed ln advance by anlon exchange. (auth)

• Research Organization: Inst. for Animal Husbandry "Schoonoord," Utrecht
• NSA Number: NSA-16-008689
• OSTI ID: 4800999
• Journal Information: Analytica Chimica Acta (Netherlands), Journal Name: Analytica Chimica Acta (Netherlands) Vol. Vol: 26; ISSN ACACA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CARBAMATES
CARBON TETRACHLORIDE
CHEMISTRY
CHLOROFORM
CYANIDES
EDTA
ERRORS
ETHYL RADICALS
HYDROXIDES
INTERFERING ELEMENTS
ION EXCHANGE
ISOTOPE DILUTION
ISOTOPES
LEAD
LEAD 210
LEAD COMPLEXES
ORGANIC CHLORINE COMPOUNDS
ORGANIC SULFUR COMPOUNDS
QUANTITATIVE ANALYSIS
SOLUTIONS
SOLVENT EXTRACTION
THALLIUM 204
TRACE AMOUNTS