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The use of dilute acid for mercury extraction from geological samples with microwave assisted heating was investigated. An orthogonal array design OA 16 (4 1 ×2 12 ) was applied to select the optimum conditions. The effects of the concentration of HNO 3 , the additions of HCl and H 2 S0 4 , the extraction time and their interactions were evaluated by...
Red sea bream, Chrysophrys major, were obtained from a marine fish cage-culture farm located in Hoshao Island near Xiamen, People's Republic of China, in August, 1990. Orthogonal array design was used to investigate the activating and inhibitory effects of the combination of waterborne Cu, Zn, Cr(VI) and Se(VI) on alkaline phosphatase (APase) activity in liver of C. major. The results obtained demonstrated...
A high performance liquid chromatographic method for the determination of ultra trace amount of aluminium in natural waters has been developed using lumogallion as a precolumn reagent for fluorimetric detection. The highly fluorescent Al-lumogallion chelate (λ ex 500 nm, λ em 574 nm) was separated on a LiChrosorb RP 18 column with an eluent containing 3:7 acetonitrile/0...
Most solid-phase microextraction methods are based on poly (dimethylsiloxane)-coated silica fibers. In the present study, pencil lead was used as an alternative sorbent for solid-phase microextraction. Its application to three organic pollutants with different polarity in water was investigated. The detection limit for determination by gas chromatography with electron capture detector was 0.005...
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