Water samples were analyzed for HMs including lead (Pb), cadmium (Cd), iron (Fe), nickel (Ni), chromium (Cr) and copper (Cu) using atomic absorption spectrophotometer (AA-6601, Shimadzu), following APHA (1992) procedures in the laboratory of Environ- mental Protection Agency, Peshawar. Plant samples were properly washed to remove clay and sand particles and dried in oven at 70 oC for 48 h to a constant weight. The dry weights were determined and the dried samples were powdered, and stored for further analyses. Sub-samples were subsequently digested with 5 mL concentrated HNO3 at 160 oC till colorless solution was obtained. After cooling, the suspensions were filtered and filtrate was adjusted to 50 mL with double deionised water. Similarly, sedi- ments/clay samples were treated with double acids (HNO3 and HClO4) and the HM concentrations were measured. All the samples of plants and sediments were analyzed for selected HMs including Cd, Cr, Cu, Ni, Fe, and Pb using AAS (AA-6601, Shimadzu). Reagent
Water samples were analyzed for HMs including lead (Pb), cadmium (Cd), iron (Fe), nickel (Ni), chromium (Cr) and copper (Cu) using atomic absorption spectrophotometer (AA-6601, Shimadzu), following APHA (1992) procedures in the laboratory of Environ- mental Protection Agency, Peshawar. Plant samples were properly washed to remove clay and sand particles and dried in oven at 70 oC for 48 h to a constant weight. The dry weights were determined and the dried samples were powdered, and stored for further analyses. Sub-samples were subsequently digested with 5 mL concentrated HNO3 at 160 oC till colorless solution was obtained. After cooling, the suspensions were filtered and filtrate was adjusted to 50 mL with double deionised water. Similarly, sedi- ments/clay samples were treated with double acids (HNO3 and HClO4) and the HM concentrations were measured. All the samples of plants and sediments were analyzed for selected HMs including Cd, Cr, Cu, Ni, Fe, and Pb using AAS (AA-6601, Shimadzu). Reagent
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