Lead(ll) was quantitatively extracted with 1 x 10(.4) M Calix(6)arene hexaa
cetato derivative in xylene at pH 6.0 with 4 M nitric acid. It was stripped
and determined spectrophotometrically at 520 nm using 4-(2-pyridylazo) res
orcinol. Although silver, indium and palladium showed strong interference,
metals like molybdenum, selenium, chromium, tellurium associated in. minera
ls or tin, antimony, zinc, bismuth, thallium associated in, low fusible all
oys are tolerated in the ratio 1:10. Anions, alkali and alkaline earths are
well tolerated. The method was applied for determination of lead in, real
samples like a solder. The reproducibility, expressed as Relative Standard
Deviation is +/- 1.2%.