Sains Malaysiana 29:135-143 (2000)                                                                            Sains Fizis & Gunaan /

Physical & Applied Sciences

Penentuan Cr(VI) dalam Air Menggunakan Spektrofotometer

UL-Nampak dan Reagen 1, 5-Difenilkarbazida

(Determination of Cr(VI) in water Using UV-Visible spectrophotometer

and 1, 5 diphenylcarbazide reagent)

Musa Ahmad, Elya Sufliza Marsom & Harun Hamzah

Pusat Pengajian Sains Kimia & Teknologi Makanan

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

ABSTRAK

Makalah ini membincangkan penggunaan reagen 1, 5-difenilkarbazida untuk penentuan kuantitatif Cr(VI) dalam air.  Hasil kajian menunjukkan bahawa reagen ini bertindakbalas secara optimum dengan Cr(VI) pada pH 1.0 dan memberikan rangsangan yang linear terhadap ion logam tersebut dalam julat kepekatan Cr(VI) 0.0 – 10.0 ppm.  Kaedah ini juga menunjukkan kebolehulangan yang baik semasa penentuan kepekatan Cr(VI) dengan memberikan nilai RSD sebanyak 1.92 %.  Penggunaan kaedah ini untuk penentuan Cr(VI) dalam air memberikan ralat relatif dalam julat 6.0 – 10.0 %.  Had pengesanan untuk kaedah ini adalah 0.03 ppm.

ABSTRACT

This paper highlights the potential of 1, 5-diphenylcarbazide for quantitative determination of Cr(VI) in aqueous environment.  The study showed that the reagent reacted with Cr(VI) at an optimum pH 1.0 and produced a linear response at Cr(VI) concentration range of 0.0 – 10.0 ppm. This method showed a good reproducibility in the determination of Cr(VI) concentration with a RSD value of 1.92 %.  The relative error for this method is in the range of 6.0 – 10.0 %.  The calculated limit of detection of this method was 0.03 ppm.

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