Yr. Zhu et al., SYNTHESIS OF A NEW REAGENT 4-(2'-THIAZOLYLAZO)-6-FORMYL-RESORCINOL AND SPECTROPHOTOMETRIC DETERMINATION OF LEAD(II) IN WASTE-WATER, Indian journal of chemistry. Sect. A: Inorganic, physical, theoretical & analytical, 35(11), 1996, pp. 1009-1010
Synthesis and characteristics of a new chromogenic reagent, 4-(2'-thia
zolylazo)-6-formyl-resorcinol (TAFR) has been reported. The optimum co
nditions for spectrophotometric determination of lead (II) using TAFR
is present. At pH 7.5-8.0, TAFR forms a 1:1 red complex with lead (II)
with molar absorptivity 1.62 x 10(4) l mol(-1) cm(-1) at 565 nm. Beer
's law is obeyed in the range of 0-8 mu g/25 mi Pb (II). The method ha
s been applied for the direct determination of lead (II) in water samp
les.