Analysis of water samples

Sago Starch Milk While Proceeded

Concentrations of Al, B, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, P, Pb, and Zn in the water samples were measured with an inductively coupled plasma (ICP) spectrometer (IRIS, Thermo Jallel-Ash, USA). DOC concentration was determined with a total organic C analyzer (TOC-VCPH, Shimadzu, Japan). An aliquot of canal water samples collected from the seven sago palm cultivation blocks in July 2003 and January and July 2004 (20 ml) was fractionated on a column packed with 1.5 ml of anion exchange resin (Q Sepharose Fast Flow, Amersham Biosciences, Sweden) into adsorbed and non-adsorbed fractions. The concentrations of DOC and metallic elements in the non-adsorbed fraction were determined with TOC-VCPH and IRIS, and metallic elements distributed in the adsorbed and nonadsorbed fractions were regarded as organically bound and free cation forms, respectively (Kimura et al. 1998). Ultra-pure water that was passed through the resin under the same conditions as those for canal water samples was analyzed as blank. DOC was almost completely adsorbed to the resin (97 ± 4%). The amount of DOM-bound Ca could not be estimated due to the unexpectedly high recovery exceeding 100%.