Malaysian Journal of Analytical Sciences Vol 18 No 1 (2014): 140 – 147

 

 

 

Penentuan TABURAN HARIAN Levoglukosan Di Udara Secara Kolorimetri

 

(Determination of Levoglucosan Diurnal Pattern in Air by Colorimetric Method)

 

Mohd Zaidi Mat Satar¹, Mohd Talib Latif², Mohamed Rozali Othman¹*

 

¹Pusat Pengajian Sains Kimia dan Teknologi Makanan,

²Pusat Pengajian Sains Sekitaran dan Sumber Alam,

Fakulti Sains dan Teknologi,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

*Corresponding author: rozali@ukm.my

 

 

Abstrak

Levoglukosan (1, 6-anhidro-β-D-gukopiranosa) berpotensi dijadikan sebagai pengesan spesifik bagi partikel yang terbebas daripada pembakaran biojisim disebabkan kestabilannya di atmosfera serta wujud dalam komposisi yang banyak. Kaedah yang tepat bagi penentuan kandungan levoglukosan di udara adalah penting bagi mengkaji pelbagai kesan levoglukosan terhadap atmosfera. Kajian ini bertujuan mengkaji dan membangunkan satu kaedah pensampelan optimum yang berpotensi dalam menyerap kandungan maksimum levoglukosan yang hadir di udara. Pensampelan udara dijalankan dengan menggunakan sistem penjerap udara yang mengandungi air nyahion. Sampel yang diperolehi kemudiaanya dianalisis menggunakan kaedah kolorimetri Anthrone-Asid Sulfurik di mana serapan analit diukur menggunakan spektrometer ultra lembayung-nampak pada panjang gelombang 620 nm. Hasil kajian menunjukkan bahawa keadaan yang optimum bagi pensampelan levoglukosan di udara adalah dengan menggunakan air nyahion sebagai larutan penyerap pada kadar alir 1.0 L/min. Kepekatan levoglukosan didapati tidak dipengaruhi oleh tempoh penyimpanan menunjukkan levoglukosan di dalam larutan penyerap adalah stabil. Penutupan tiub penyerap semasa pensampelan didapati mampu mempengaruhi kepekatan levoglukosan di udara.

 

Kata kunci: Kolorimetri, Levoglukosan (1,6-anhidro-β-D-glukopiranosa), udara persekitaran

 

Abstract

Levoglucosan (1,6-anhydro-β-d-gucopyranose) in the atmosphere a major constituent of biomass burning smoke was able to be used as a specific indicator due to their stability during atmospheric transport and present at expected levels. Therefore, accurate determination of levoglucosan is crucial in order to investigate the possible effects of levoglucosan on the atmosphere. The aim of this study was to identify the optimum sampling method for measuring the maximum quantity of levoglucosan present in ambient air. Air samples were collected using an air absorbing system containing deionised distilled water. Samples obtained were analysed by colourimetry anthrone-sulphuric acid method where absorbance of analyte was measured at 620 nm using UV-visible spectrophotometer. Results obtained found that the optimum sampling method consisted of deionised water as an absorbent solution with the flow rate of 1.0 L/min. The concentration of levoglucosan in all sampling methods remained constant regardless of the storage period (1 day and 4 days), indicating that levoglucosan in the absorbing solution are quite stable. Covering the impinger tube with aluminium foil was shown to influence the amount of levoglucosan detected.

 

Keywords: colorimetry, Levoglucosan (1, 6-anhydro-β-d-gucopyranose), ambient air

 

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