Octadecyl silica membrane disks modified with a new Schiff's base for the preconcentration of lead and copper before their determination in water samples.
A simple and fast method for the extraction and determination of ppt level of Pb2+ and Cu2+ ions using octadecyl-bonded silica membrane disks modified by a new tetradentates Schiffs base [Bis(2,4-dimethoxy benzaldehyde) ethylen diimine](TDSB) and inductively coupled plasma atomic emission spectrometry is described. Extraction efficiency, and influence of flow rate, pH, type and the least amount of acid for stripping of Cu2+ and Pb2+ from the modified disks and break through volume were evaluated. The maximum capacity of the membrane disks modified by 5 mg of TDSB used was found to be 347 +/- 7 and 470 +/- 6 microg of copper and lead, respectively. The concentration factor is 500 (for 2500 mL water sample and flow rate of 20 mL min(-1)) and detection limit of the proposed method is 12.5 and 150.5 pg/ml for Cu2+ and Pb2+, respectively. The method was applied to the determination of Cu2+ and Pb2+ ions from various water, wastewater, black tea, and hot pepper samples.
Ganjali
Mohammad Reza
MR
Department of Chemistry, Tehran University, Tehran, Iran. Ganjali@khayam.ut.ac.ir
Pourjavid
Mohammad Reza
MR
Haji-Agha Babaei
Leila
L
Salavati-Niasari
Masoud
M
D002212:Capsicum / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D008567:Membranes, Artificial; D012545:Schiff Bases / Q000737:chemistry; D012822:Silicon Dioxide; D013662:Tea / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014873:Water Pollutants / Q000032:analysis*
D008567:Membranes, Artificial; D012545:Schiff Bases; D013662:Tea; D014873:Water Pollutants; D014867:Water; D007854:Lead; D012822:Silicon Dioxide; C042953:octadecyl silane-bonded silica; D003300:Copper