Malaysian Journal of Analytical Sciences Vol 19 No 6 (2015): 1194 - 1204

 

 

 

APPLICATION OF CARRIER ELEMENT-FREE CO-PRECIPITATION METHOD FOR Ni(II), Cu(II) AND Zn(II) IONS DETERMINATION IN WATER SAMPLES USING CHRYSIN

 

(Penggunaan Kaedah Ko-Pemendakan Bebas Elemen Pembawa Untuk Penentuan Ion Ni(II), Cu(II) Dan Zn(II) Dalam Sampel Air Menggunakan Krisin)

 

Layth Imad Abd Ali¹, Wan Aini Wan Ibrahim^1,2*, Azli Sulaiman¹, Mohd Marsin Sanagi³

 

¹Separation Science and Technology Group, Department of Chemistry, Faculty of Science

²Frontier Materials Research Alliance

³Ibnu Sina Institute for Scientific & Industrial Research

Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia

 

*Corresponding author: wanaini@kimia.fs.utm.my; waini@utm.my

 

 

Received: 9 December 2014; Accepted: 16 October 2015

 

 

Abstract

A co-precipitation method was developed to separate and pre-concentrate Ni(II), Cu(II) and Zn(II) ions using an organic co-precipitant, chrysin without adding any carrier element termed as carrier element-free co-precipitation (CEFC).  Analytes were determined using flame atomic absorption spectrometry (FAAS). The influence of analytical conditions, such as pH of the solution, quantity of co-precipitant, standing time, centrifugation rate and time, sample volume, and interference of concomitant ions were investigated over the recovery yields of the trace metals. The limit of detection, the limit of quantification and linearity range obtained from the FAAS measurements were found to be in the range of  0.64 to 0.86 µg L^–1, 2.13 to 2.86 μg L^–1 and 0.9972 to 0.9989 for Ni(II), Cu(III) and Zn(II) ions, respectively. The precision of the method, evaluated as the relative standard deviation (RSD) obtained after analyzing a series of 10 replicates, was between 2.6% to 3.9% for the trace metal ions. The proposed procedure was applied and validated by analyzing river water reference material for trace metals (SLRS-5) and spiking trace metal ions in some water samples.  The recoveries of the analyte metal ions were between 94.7-101.2%.

 

Keywords: Carrier element-free coprecipitation, Preconcentration, Chrysin, Trace metal ions, FAAS

 

Abstrak

Suatu kaedah ko-pemendekan telah dibangunkan untuk pemisahan dan pra-pemekatan ion Ni(II), Cu(II) dan Zn(II) menggunakan ko-pemendak organik, krisin tanpa penambahan sebarang elemen pembawa,  dikenali sebagai ko-pemendakan bebas elemen pembawa (CEFC).  Analit ditententukan menggunakan spektrometri serapan atom nyala (FAAS).  Pengaruh keadaan analisis, seperti pH larutan, kuantiti ko-pemendak, masa berdiri, kadar dan masa pengemparan, isipadu sampel, dan gangguan ion iringan telah dikaji ke atas hasil perolehan semula logam surih.  Had pengesanan, had kuantitatif dan julat kelinearan yang diperoleh daripada pengukuran FAAS ialah antara 0.64 - 0.86 µg L^–1, 2.13 - 2.86 μg L^–1 dan 0.9972 - 0.9989, masing-masing untuk ion Ni(II), Cu(III) and Zn(II).  Kepresisan kaedah yang dibangunkan telah dinilai berdasarkan sisihan piawai relatif (RSD) yang diperoleh setelah menganalisis 10 replikat sampel (2.6-3.9%) untuk ion logam surih.  Prosedur cadangan telah digunakan dan ditentusahkan dengan menganalisis bahan air sungai rujukan untuk logam surih (SLRS-5) dan menambahkan ion logam surih ke dalam beberapa sampel air.  Perolehan semula analit ion logam ialah antara 94.7-101.2%.

 

Kata kunci: Ko-pemendakan bebas elemen pembawa, pra-pemekatan, krisin, ion logam surih, FAAS

 

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