title: Optimisation of digestion method for determination of arsenic in shrimp paste sample using atomic absorption spectrometry.
abstract: The microwave digestion method was developed and verified for the determination of arsenic in shrimp paste samples. Experimental design for five factors (HNO(3) and H(2)O(2) volumes, sample weight, microwave power and digestion time) were used for the optimisation of sample digestion. For this purpose, two level half factorial design, which involves 16 experiments, was adopted. The concentration of arsenic was analysed by graphite furnace atomic absorption spectrometry. Design Expert® 7.0 software was used to interpret all data obtained. The combination of 2 mL HNO(3) and 1 mL H(2)O(2) volumes, 0.1g sample weight, 1400 W power and 5 min digestion time was found to be the optimum parameters required to digest the shrimp paste samples. Tests with spiked samples presented good recoveries with relative standard deviations between 0.32% and 5.35%.
authors: Faculty of Science and Technology, Universiti Sains Islam Malaysia, Bandar Baru Nilai, 71800 Negeri Sembilan, Malaysia. cw.zanariah@usim.edu.my
authors: C W Zanariah C W
authors: CW
authors: Ngah
authors: Mohd Adib
authors: MA
authors: Yahya
mesh_terms: D053000:Analytic Sample Preparation Methods / Q000379:methods*; D000818:Animals; D001151:Arsenic / Q000302:isolation & purification*; D003445:Crustacea / Q000737:chemistry*; D004063:Digestion; D005506:Food Contamination / Q000032:analysis; D017747:Seafood / Q000032:analysis*; D013054:Spectrophotometry, Atomic
chemical_list: D001151:Arsenic