The Malaysian Journal of Analytical Sciences Vol 10 No 1 (2006): 99 – 108

 

 

 

 

PENGEMBANGAN SATU TEKNIK PEMEKATAN FASA PEPEJAL

BAGI ANALISIS LOGAM BERAT DALAM AIR MINUM

 

Md. Pauzi Abdullah*, Rizana Yusof  dan  M.B.Zakaria

 

Pusat Pengajian Sains Kimia dan Teknologi Makanan,

Fakulti Sains dan Teknologi, 43600 UKM Bangi, Selangor Darul Ehsan

 

*Corresponding author: mpauzi@pkrisc.cc.ukm.my

 

Abstract

A solid phase preconcentration technique with the final analysis using ICP-OES was developed for  the  analysis  of  lead, cadmium, copper, nickel and manganese in drinking water. Three different adsorbents namely commercial Chelex 100 (i.e. the polystyrene-divinylbenzene with  imidodiacetic acid functional group), Amberlite XAD-4 resin coated with ammonium pyrolidine dithiocarbamate (APDC) and the C18-silica gel chelated with 4-(2-pyridilazo)-resorcinol (PAR) were evaluated for this purpose. For each adsorbent, adsorption study was carried out at optimized conditions in terms of sample solution pH, volume of elution and the flow rate. The parameters investigated include recovery, extraction efficiency, accuracy,  precision,  method  detection  limit,  limit  of  quantitation,  adsorption  capacity  and  the  reuse potential of the adsorbent. Result shows that the Chelex 100, with the recovery ranged from 85-118%, is the best adsorbent for the analysis of Pb, Cd, Cu, Ni and Mn at the metals concentration ranges of 10 to 400 pgll. In contrast, the C18-silica gel is only found to be suitable at pH 7 but only with the recovery of 65 to 83%. The adsorbent based on XAD-4 seemed to selectively adsorbed Pb as much as 83% but not other metals studied.

 

Keywords: Metals in drinking water, Chelex 100, C18-Silica gel-APDC, XAD-4.

 

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