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lüll Simple detection of trace Pb2+ by enrichment on cerium phosphate membrane filter coupled with color signaling Suzuki TM; Llosa Tanco MA; Pacheco Tanaka DA; Hayashi H; Takahashi YAnalyst 2005[Nov]; 130 (11): 1537-42A Pb(2+) selective membrane filter was fabricated from the fibrous CeO(H(2)PO(4))(2).2H(2)O (CeP) crystals by blending with cellulose fiber. Enrichment of ppb level of Pb(2+) was achieved simply by filtration of aqueous sample solution through the membrane filter. Pb(2+) was strongly retained on the membrane filter by accommodation into the interlayer gallery of a CeP crystal. Visual detection of the enriched Pb(2+) was achieved by subsequent color signaling as PbS deposit upon treatment of the membrane filter with 3% Na(2)S solution. The analytical procedure and sample treatment conditions were optimized with respect to pH of the sample solution, filtration rate and masking of interfering ions. Detection of 20 ppb of Pb(2+) was not interfered by the presence of 1000-fold of Ca(2+), Mg(2+), and up to 100-fold of Fe(3+)and Cu(2+) by masking with 1 x 10(-3) mol dm(-3) of iminodiacetic acid (IDA). Most anions including phosphate (20 000 times) did not interfere with the determination of Pb(2+). The present simple method was applied to the determination of Pb(2+) in real samples like mine valley water.|*Mining[MESH]|Cerium[MESH]|Colorimetry/instrumentation/methods[MESH]|Filtration[MESH]|Lead/*analysis[MESH]|Phosphates[MESH]|Trace Elements/*analysis[MESH]|Water Pollutants, Chemical/*analysis[MESH] |