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Title: Orthogonal array design (OAD) for the optimization of mercury extraction from soils by dilute acid with microwave heating
Authors: Gu, W.
Zhou, C.Y.
Wong, M.K. 
Gan, L.M. 
Keywords: Dilute acid
Microwave digestion
Orthogonal array design
Issue Date: Aug-1998
Citation: Gu, W., Zhou, C.Y., Wong, M.K., Gan, L.M. (1998-08). Orthogonal array design (OAD) for the optimization of mercury extraction from soils by dilute acid with microwave heating. Talanta 46 (5) : 1019-1029. ScholarBank@NUS Repository.
Abstract: The use of dilute acid for mercury extraction from geological samples with microwave assisted heating was investigated. An orthogonal array design OA16(41 x 212) was applied to select the optimum conditions. The effects of the concentration of HNO3, the additions of HCl and H2SO4, the extraction time and their interactions were evaluated by the mixed-level orthogonal array design (OAD). The results indicated that the addition of small amount of HCl would improve significantly the extraction of mercury from soil matrices. From the study, it is seen that the mercury in the soil matrices could be extracted completely by 14% (v/v) HNO3 with small quantity of HCl. The effects of the pressure within the digestion vessel and the sample mass were studied under the optimum conditions derived from the OAD. The extraction methods with optimum conditions were evaluated by determining mercury in NIST SRM 1645 River Sediment, NIES CRM No. 2 Pond Sediment and NRCC BCSS-1 Marine Sediment. Recoveries of 78-109% were achieved. Good mean recoveries of 95-98% were also obtained from real soil samples spiked with different species of mercury.
Source Title: Talanta
ISSN: 00399140
DOI: 10.1016/S0039-9140(97)00373-1
Appears in Collections:Staff Publications

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