Determination of Lead in Cosmetic Sampels Using Coated Wire Lead (II) Ion Selective Electrode Based On Phyropillite

Qonitah Fardiyah (Department of Chemistry, Faculty of Mathematic and Natural Science, Brawijaya University, Malang)
Barlah Rumhayati (Department of Chemistry, Faculty of Mathematic and Natural Science, Brawijaya University, Malang)
Ika Rosemiyani (Department of Chemistry, Faculty of Mathematic and Natural Science, Brawijaya University, Malang)

UNEJ e-Proceeding
2016: Proceeding The 1st International Basic Science Conference

A coated wire ion selective electrode (CW-ISE) based on pyrophyllite for detection lead (II) in cosmetic samples was developed. CW-ISE has easy measurement for field analysis, good selectivity and sensitivity. The CW-ISE’s membrane consist of mixture an inorganic material of pyrophyllite as  ionophore, polyvinylchloride (PVC) as the matrix polymer, activated carbon and dioktilftalat (DOP) as a plasticizer dissolved in tetrahydrofuran (THF) solvent (1:3 w/v).  It showed a good Nernstian slope of 29.33 mV/decade concentration, a lead linear range concentration between 10-1- 10-5 M, and detection limit of 8.054 x10-6 M  (equal with 1.669 ppm of lead). And could be used optimally at pH 5 and showed a good selectivity for interfering ions (sodium ion, mercury ion and chromium ion) with selectivity order of lead >mercury>chromium>sodium.  The CW-ISE Lead (II) based on pyrophyllite could be applied for determination lead in cosmetic samples, with precision of 95.42% and accuracy of 96.49%. Based on the statistical t test with 5% confidence limit, the potentiometric method and Atomic Absorption Spectrophotometry method had no significant differences.