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Articles by B.K. Mitra
Total Records ( 4 ) for B.K. Mitra
  A. Islam , A.J.M.S. Karim , H.M. Khaled , B.K. Mitra and M.A.M. Miah
  A study was conducted with four soils samples (0-15 cm) collected from different levels of arsenic (As) contaminated area where arsenic contaminated irrigation water from shallow tube well was used for rice cultivation to determine the maximum adsorption capacity, energy of adsorption and buffering capacity of As. Arsenic was determined by a Perkin-Elmer Aanalyst 100 atomic absorption spectrophotometer equipped with a FIAS-100 flow injection hydride generation system. The test soils showed a large capacity of arsenic adsorption. The application of arsenic progressively increased the equilibrium solution concentration of arsenic. At the lower levels of equilibrium concentration, the adsorption of arsenic linearly increased, but at greater levels of equilibrium solution concentration the rate of As adsorption decreased. Conventional adsorption equations-Langmuir, Freundlich and Temkin equations were used to describe arsenic sorption characteristics of soils. All soils were found to fit well in all the equations (R2 = 0.9052 to 0.9974). Highest and lowest adsorption maxima were observed 2000 mg kg-1 in soil 2 and 3 and 1111 mg kg-1 in soil 4 respectively. The highest and lowest arsenic buffering capacity were observed 405 in soil 2 and 185 in soil 4 respectively. The highest energy of adsorption obtained for the soil 4, which showed lowest arsenic adsorption maxima and the lowest energy of adsorption obtained with soil 2 followed by soil 3, which showed the highest arsenic adsorption maxima. Arsenic buffering capacity was positively correlated with the maximum adsorption capacity of the soils (r = 0.99). The As adsorption parameters were highly correlated with clay content, FeO and MnO content of the soils and not with the total As content of the soils.
  B.K. Mitra , C. Sasaki , K. Enari , N. Matsuyama and S. Pongpattanasiri
  Groundwater quality is an inevitable factor for sustainable agriculture as a source of irrigation water. Therefore, the study was conducted in an irrigated sand dune area of northwest Honshu island in Japan to evaluate the groundwater quality for irrigation. Three observation wells were installed in the investigated field made of Poly Vinyl Chloride (PVC) pipe with three plastic tubes to collect groundwater of 2.0, 2.5 and 3.0 m. The sampling was performed every month from January to November, 2005. Assessment of groundwater quality was performed on the basis of Total Dissolved Solids (TDS), concentration of sodium (Na), calcium (Ca) and magnesium (Mg), Sodium Absorption Ratio (SAR), total hardness (HT) and concentration of phosphate phosphorus (PO4-P). Total dissolved solids in groundwater was ranged between 145.5-249.4 mg L-1 during the investigation period, revealed that irrigation using groundwater of the study area would not cause salinity hazards. Cocentrations of Na, Ca and Mg were decreased with depth throughout the investigation period. The average concentration of Na and SAR value were 18.8 mg L-1 and 0.81, respectively. Since groundwater of the study area contained low concentration of Na with low SAR values, there would not be any possibility of sodium hazards from irrigation using groundwater. On average groundwater of the study area contained 27.5 mg L-1 Ca and 9.35 mg L-1 Mg, which might contribute to moderate hardness of groundwater in the study area.
  B.K. Mitra , C. Sasaki , K. Enari , N. Matsuyama and S. Pongpattanasiri
  This study was conducted to evaluate the groundwater quality in sand dune area of northwest Honshu island, Japan. Three observation wells were installed with three plastic tubes to collect ground water of 2.0, 2.5 and 3.0 m depth. Groundwater samples were analyzed for EC, pH, DO, concentration of Fe, K and NO3-N during the period of April, 2004 to March, 2005. Groundwater level and soil environment from 0.1 m through 3.0 m was also evaluated. The groundwater level of the study field was observed within a range of 114.43 to 169.33 cm below ground surface. The results showed that EC, pH, DO and K concentration in groundwater were decreased with increasing depth whereas the opposite trend was observed for Fe. The groundwater of the study area was found not to be suitable for irrigation since concentration of Fe was more than 5 mg L-1. Average concentrations of NO3-N in groundwater of the study area were 0.026 mg L-1. Since concentration of NO3-N was very low in groundwater, there would not be any threat to human health and environment.
  U.A. Naher , M.A. Hashem , B.K. Mitra , M.K. Uddin and M.A. Saleque
  A pot study was conducted at greenhouse to measure the P and K mineralization rate from fulvic acid with fresh poultry manure, partially decomposed cowdung, rice straw and lime under covered and uncovered condition. The decomposition period was 90 days. Initially the cowdung contain 127 ppm of fulvic acid P and 2.23 meq /100 g of fulvic acid K whereas the poultry manure contain 378 ppm of fulvic acid P and 13.4 meq /100 g of fulvic acid K. The P and K immobilization takes place after 15 days of decomposition and with the passing of time it increased gradually. The lime addition increased P concentration in cowdung treatments and the highest of 1505 ppm of fulvic acid P was recorded at 75 days of decomposition in the covered cowdung + lime treatment. The addition of rice straw increased K concentration in both cowdung and poultry manure treatments but it decreased the mineralization rate. The highest of 67 meq /100 g of fulvic acid K was mineralized at 75 days of decomposition in the uncovered poultry manure + rice straw treatment. The fulvic acid P mineralization was higher in the covered cowdung and poultry manure treatments. The fulvic acid K mineralization was also high in the covered cowdung treatments but in the poultry manure treatments it was higher in the uncovered treatments.
 
 
 
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