title: Comparative study on open system digestion and microwave assisted digestion methods for metal determination in shrimp sludge compost.
abstract: The aim of this work was to evaluate two different digestion methods for the determination of the total concentration of metals (Zn, Cu, Cr, Ni, Pb and Cd) in shrimp sludge compost. The compost made from shrimp aquaculture sludge co-composted with organic materials (peat, crushed bark and manure) was used as an organic growing medium for crop. Open system digestion and microwave assisted digestion procedures were employed in sample preparation. Various combinations and volumes of hydrofluoric, nitric and hydrochloric acids were evaluated for the efficiency of both methods. A certified reference material (CRM 146) was used in the comparison of these two digestion methods. The results revealed a good agreement between both procedures and the certified valued. The best recoveries were found in the range between 95% and 99% for microwave assisted digestion with a mixture of 2 ml of HF, 6 ml of HNO(3) and 2 ml of HCl. This procedure was recommended as the method for digestion the compost herein based on the recovery analysis and time taken.
authors.affiliation: Environmental Research Group, Department of Chemistry, University of Malaya, Kuala Lumpur 50603, Malaysia. keivan nemati@yahoo.com
authors.forename: Keivan
authors.initials: K
authors.lastname: Nemati
authors.forename: Nor Kartini
authors.initials: NK
authors.lastname: Abu Bakar
authors.forename: Mhd Radzi
authors.initials: MR
authors.lastname: Bin Abas
authors.forename: Elham
authors.initials: E
authors.lastname: Sobhanzadeh
authors.forename: Kah Hin
authors.initials: KH
authors.lastname: Low
mesh_terms: D000818:Animals; D003445:Crustacea; D057230:Limit of Detection; D008670:Metals / Q000032:analysis*; D008872:Microwaves; D012015:Reference Standards; D012722:Sewage; D012987:Soil; D013054:Spectrophotometry, Atomic
chemical_list: D008670:Metals; D012722:Sewage; D012987:Soil