2.3. Sampling and sample preparation
Roots were washed with distilled water, 0.1 M EDTA and distilled
water again. The samples were frozen in liquid nitrogen and stored at
−80°C. The sampleswere freeze-dried at−50°C until constantweight.
Dried plant samples were digested with 5mL acid mixture of HClO4
and HNO3 (15/85%, v/v) in digestion Teflon tubes overnight. Digestion
was completed by gradual increase of temperature from 60 to 195 °C
according to Zhao et al. (1994). Digestion protocol: 3 h, 60 °C; 1 h,
100 °C; 1 h, 120 °C; and 3 h, 195 °C, then the complete digestion was
achieved. After cooling, 2.5mL HCl (20%, v/v) was added, whirl mixed
and warmed to 80 °C for 1 h. The digested samples were filled to
10mL with distilled water.
2.3. Sampling and sample preparationRoots were washed with distilled water, 0.1 M EDTA and distilledwater again. The samples were frozen in liquid nitrogen and stored at−80°C. The sampleswere freeze-dried at−50°C until constantweight.Dried plant samples were digested with 5mL acid mixture of HClO4and HNO3 (15/85%, v/v) in digestion Teflon tubes overnight. Digestionwas completed by gradual increase of temperature from 60 to 195 °Caccording to Zhao et al. (1994). Digestion protocol: 3 h, 60 °C; 1 h,100 °C; 1 h, 120 °C; and 3 h, 195 °C, then the complete digestion wasachieved. After cooling, 2.5mL HCl (20%, v/v) was added, whirl mixedand warmed to 80 °C for 1 h. The digested samples were filled to10mL with distilled water.
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