tailieunhanh - Development of multivariate calibration method for simultaneous determination of nickel, lead and zinc in tap water
The method was applied for determination of these ions in tap water samples at ppm level, with recoveries (and RSD) of nickel, lead and zinc were % ( %), % ( %) and % ( %), respectively. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 18, SOÁ T3 - 2015 Development of multivariate calibration method for simultaneous determination of nickel, lead and zinc in tap water Huynh Minh Chau Ly Du Thu Pham Thai Thach Pham Thi Bao Tran Duong Khanh Minh Nguyen Anh Mai University of Science, VNU-HCM (Received on December 12 th 2014, accepted on August 12 th 2015) ABSTRACT Conventional spectrophotometric methods for simultaneous determination of nickel, lead and zinc in forms of complexes with a reagent is not feasible due to the overlap of their absorption spectra. A multivariate calibration method was used to overcome this problem. In this study, the calibration model was constructed based on absorption spectra of 30 mixture standards in the range from 490 to 600 nm. Factors influencing experimental results such as amount of reagents, pH, and color development time were optimized. The standard calibration ranges for determination of nickel, lead and zinc were found at ppm. The method was applied for determination of these ions in tap water samples at ppm level, with recoveries (and RSD) of nickel, lead and zinc were % ( %), % ( %) and % ( %), respectively. Key words: Partial least squares, lead, nickel, zinc, spectrophotometry, multivariate calibration. INTRODUCTION Nickel, lead and zinc co-exist in many components usually have overlapped absorption samples. Several techniques such as XFS [1], polarography [2], AAS [3], ICP-OES [4] were used to determine these metal ions. Among these techniques, spectrophotometry was commonly spectra which decreases accuracy. This research depicted a method for simultaneous determination of nickel, lead and zinc by combining spectrophotometry with multivariate calibration used in thanks to its low instrumental investment and the ease of performance. However, direct determination of the metal ions without prior separation is impossible due to the spectral overlap. Real samples having .
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