Spectrophotometric determination of lead in industrial, environmental, biological and soil samples using 2,5-dimercapto-1,3,4-thiadiazole

  • Ahmed M
  • Mamun M
  • 1

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Abstract

A very simple, ultra-sensitive and fairly selective non-extractive
spectrophotometric method for the determination of trace amounts of lead
with 2,5-dimercapto-1,3,4-thiadiazole (DMTD) has been developed. DMTD
reacts in slightly acidic (0.0015-0.01 M HCl) aquatic media with
lead(II) to give a greenish-yellow chelate, which has an absorption
maximum at 375 nm. The reaction is instantaneous and absorbance remains
stable for 24 h. The average molar absorption coefficient and Sandell's
sensitivity were found to be 4.93 x 10(4) 1 mol(-1) cm(-1) and 15 ng
cm(-2) of Pb, respectively, Linear calibration graphs were obtained for
0.1-40 mug ml(-1) of Pb; the stoichiometric composition of the chelate
is 1:2 (Pb-DMTD). The interference from over 50 cations, anions and
complexing agents has been studied at 1 mug ml(-1) of Pb. The method
developed was used successfully in the determination of lead in several
standard reference materials (alloys and steels), environmental waters
(potable and polluted), biological samples (human blood and urine), soil
samples, solutions containing both lead(II) and lead(IV) and complex
synthetic mixtures. The method has high precision and accuracy (S =
+/-0.01 for 0.5 mug ml(-1)). (C) 2001 Elsevier Science B.V. All rights
reserved.

Author-supplied keywords

  • 3
  • 4-thiadiazole; alloy; steel; environmental; biolog
  • 5-dimercapto-1
  • spectrophotometry lead determination; 2

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Authors

  • M J Ahmed

  • M A Mamun

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