Dual-wavelength spectrophotometric determination of trace sulphide in domestic water through its ligand-exchange reaction with silver-Cadion 2B-triton X-100.
Trace amounts of S(2-) can be determined by means of the exchange reaction with the Ag(+)-Cadion 2B complex in presence of Triton X-100 and Na(2)B(4)O(7) solution, by dual-wavelength spectrophotometry. Beer's law is obeyed for the sulphide range 0-2.0 microg/25 ml . The apparent molar absorptivity is 2.65 x 10(5) l.mole(-1).cm(-1). The effect of diverse ions in the presence of EDTA has been studied. The interferences produced by some anions in water samples can be eliminated by precipitation with zinc acetate.
Wei
F S
FS
China National Environmental Monitoring Centre, Beijing, China.
Teng
E J
EJ
Rui
K S
KS