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Item Volumetric and Sound Velocity Studies on L-Lysine and L-Arginine in Aqueous Sodium Benzoate Solution at Different Temperature(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2018-09) Mou, Iffat Ara; Motin, Prof. Dr. Md. AbdulIn this study, a general volumetric and sound velocity method was used to analyze the effects of sodium benzoate (SB) on the structure of essential amino acids (L-lysine, L-arginine). Densities and sound velocities of L-lysine and L-arginine in aqueous and in aqueous 0.05 mol.kg-1, 0.2 mol.kg-1, 0.35 mol.kg-1 and 0.5 mol.kg-1 SB solutions have been studied at 293.15K to 313.15K with an interval of 5K. The density data have been used to calculate apparent molar volume (φv), limiting apparent molar volume (φv 0), limiting apparent molar volume transfer (Δtrφv 0), apparent molar expansibilities ( 0 E ) and Helper’s constant ( E / T) p 0 . The acoustic properties such as adiabatic compressibility (βs), apparent molar adiabatic compressibility (k), limiting apparent molar adiabatic compressibility (φk 0), apparent molar adiabatic compressibility transfer (Δtrφk 0), acoustic impedance (Z) and hydration number (nH) have been calculated by densities and sound velocities data. The densities increase with the increase of concentration of amino acids. Densities of amino acids in aqueous SB solutions are higher than that of amino acids in aqueous solution. The limiting apparent molar volumes (φv 0) and the values of experimental slope (Sv) are positive. The smaller values of Sv as compared to φv 0 values suggest the dominance of solute-solvent interaction over the solute-solute interaction. The limiting apparent molar volume transfer (Δtrφv 0) values of L-lysine and L-arginine in SB solutions are negative. This indicate that ion-hydrophobic and hydrophobichydrophobic group interaction are dominating over the hydrophilic-hydrophilic interaction. The values of limiting apparent molar expansion ( 0 E ) are positive. These trends in limiting apparent molar expansions for these amino acids in each concentration of SB solutions indicating the presence of solute-solvent interaction. The Hepler’s constant p ( E / T) 0 values of binary system are entirely positive for all studied amino acids suggest the studied systems act as structure makers. In ternary system some values are small negative and some values are positive. Hepler’s constant p ( E / T) 0 in ternary solutions indicating the structure making properties of amino acids in SB solutions. The values of partial molar volumes (V̅ 2) increase with increasing of concentration of L-lysine, L-arginine for the studied systems. As the concentration of amino acids increases, the adiabatic compressibility (βs) decreases. This indicates the water molecules around the amino acids are less compressible than the water molecules in the bulk solution. The negative apparent molar adiabatic compressibility (k) values indicate the greater loss of structural compressibility of water implying a greater ordering effect by the solute on the solvent. Δtrφk 0 values of L-lysine are positive whereas Δtrφk 0 of L-arginine are negative. This indicate that hydrophilichydrophilic and ion-hydrophilic interaction are dominating for L-lysine systems whereas hydrophobic-hydrophobic and ion-hydrophobic interactions are dominating for L-arginine systems. The small Sk values also indicates the solute-solvent interactions. The increase in acoustic impedance Z, indicates the presence of effective solvent-solvent interactions with the increase in solution concentration. The positive hydration number (nH) values indicate an admirable solubility of the solutes. Water molecules around amino acids have less shrinkage than water molecules in bulk solutions. The compressive strength of the ternary solution is less than that of the binary solution. This result suggests that the proteins or peptides generated from the studied amino acids will be denatured in ternary SB solutions.Item Volumetric and Viscometric Properties of N-Acetylcysteine in Dimethylformamide Containing Binary and Ternary Mixtures(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2019-06-29) Pal, Gopal; Yousuf, Prof. Dr. Mohammad AbuThe density and viscosity of NAC (0.10 to 1.00) mol.L−1 in H2O, DMF and DMF– H2O mixed solutions were measured and studied over the entire molarity range with in the temperature range of 298.15 to 318.15 K at 5 K interval. The apparent molar volumes, were determined from density values experimented by Density and Sound Velocity Meter (DSA 5000M) Anton Paar, Austria. In the NAC–H2O and NAC in [1:4] and [2:3] [DMFH2O] solvent systems the apparent molar volumes of NAC were found to be increased, whereas in the NAC–DMF and NAC in [4:1] and [3:2] [DMFH2O] solvent systems apparent molar volumes of NAC were found to be decreased. Apparent molar volume at infinite dilution, 0 v and Sv values were also computed according to the experimented density values. The apparent molar volume at infinite dilution provided an idea about the presence of solutesolvent interactions of the investigated systems. Sv, the experimental slopes which provided an idea about the prevailing solutesolute interactions in the mixtures. Both 0 v and Sv values indicated that there both solute-solute and solute-solvent interactions present in the binary as well as in ternary solutions. The investigated systems showed hasty increase of viscosity values with the increased NAC concentration but the values of viscosity decreased with the increase of temperature. In binary and ternary systems showed the similar trend viscosity changes but in different order of magnitude. The order for binary and ternary systems are: NAC– DMF > NACH2O and NAC in [3:2] [DMF–H2O] > NAC in [4:1] [DMF–H2O] > NAC in [2:3] [DMF–H2O] > NAC in [1:4] [DMF–H2O] > NAC–DMF > NACH2O, respectively. The viscosity values were employed to determine the viscosity coefficients i.e., A and B-coefficients; change of free energy, G*; change of enthalpy, H* as well as change of entropy, S*. Negative values of A and positive values of B co-efficients suggesting that weak solute-solute but strong solute-solvent interaction present in the binary and ternary solution, respectively. From these thermodynamic parameters state of the spontaneity of the investigated systems were known. On the basis of this data, the predominant molecular interactions occurring between NAC–H2O and NAC in [1:4] and [2:3] [DMFH2O] solvent systems were found to be solute-solute interaction, where as in NAC–DMF and NAC in [4:1] and [3:2] [DMFH2O] solvent systems solute-solvent interaction were predominant.Item Studies on Volumetric and Viscometric Properties on N-Acetylcysteine in Acetic Acid-Water Binary and Ternary Mixtures(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2019-06-29) Vattya, Banamali; Yousuf, Prof. Dr. Mohammad AbuThe density and viscosity of NAC (0.10 to 1.00) mol.L−1 in H2O, CH3COOH and H2O–CH3COOH mixed solutions were measured and analyzed over the whole concentration range at (298.15, 303.15, 308.15, 313.15 and 318.15) K temperatures. The apparent molar volumes were obtained from the experimental density data. In the NAC– H2O and NAC in [9:1] [H2O–CH3COOH] solvent systems the apparent molar volume of NAC increases, whereas in the NAC–CH3COOH and NAC in [4:1], [7:3] and [3:2] [H2O–CH3COOH] solvent systems it decreases. With the help of experimental density data apparent molar volume at infinite dilution, and Sv values were also calculated. The apparent molar volume at infinite dilution gives an idea about the presence of solutesolvent interactions while Sv is the experimental slopes which give an idea about the prevailing solutesolute interactions in the mixtures. The calculated data indicate that there may be solute-solute and solute-solvent interactions present in the binary and ternary solutions. Binary and ternary systems showed rapid increase of viscosity values with the increase in NAC concentration but the values of viscosity decreased with the increase of temperature for all the experimented system. The viscosity data were employed to find out the viscosity (A, B) coefficients, change of free energy, G*, change of enthalpy, H* as well as change of entropy, S*. From these thermodynamic parameters state of the spontaneity of the investigated systems were identified. Moreover, negative A and positive B co-efficient values suggesting that weak solutesolute but strong solute-solvent interaction present in the binary and ternary solution. On the basis of this data, the predominant molecular interactions occurring between NAC– H2O and NAC in [9:1] [H2O–CH3COOH] solvent systems were found to be solute-solute interaction, whereas in NAC–CH3COOH and NAC in [4:1], [7:3] and [3:2] [H2O– CH3COOH] solvent systems solute-solvent interaction were predominant.Item Studies on Volumetric and Sound Velocity of Ciprofloxacin in Aqueous Solution of Glucose, Sodium Chloride & Potassium Chloride Salts at Different Temperatures(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2018-06) Khanam, Masuda; Morshed, Prof. Dr. Mohammad HasanIn this study, volumetric and sound velocity method was applied to analyze the interaction of ciprofloxacin on the structure of glucose, NaCl and KCl. Densities and sound velocities of glucose, NaCl and KCl in water and in aqueous ciprofloxacin (0.03, 0.045 and 0.06) mol.kg-1 solutions have been studied at 293.15 K to 318.15 K with an interval of 5 K temperature. The density values have been used to calculate apparent molar volume (φv), limiting apparent molar volume (φv 0), limiting apparent molar volume transfer (Δtrφv 0), apparent molar expansibilities (δφv 0/δT)p and Hepler constant (δ2φv 0/δT2)p. The acoustic properties such as adiabatic compressibility (βs), apparent molar adiabatic compressibility (φk), limiting apparent molar adiabatic compressibility (φk 0), apparent molar adiabatic compressibility of transfer (Δtrφk 0), acoustic impedance (Z), relative association (RA) and hydration number (nH) have also been calculated by densities and sound velocities data. The densities increase with the increase of concentration of glucose, NaCl and KCl. Densities of glucose, NaCl and KCl in aqueous ciprofloxacin solutions are higher than that of glucose, NaCl and KCl in aqueous solution. The increase of density with concentration of glucose, NaCl and KCl can be attributed to solute-solvent interaction. The limiting apparent molar volumes (φv 0) are positive at the studied temperatures for the all mixtures indicate the presence of solute-solvent interactions. The positive values of Sv indicate strong solute-solute interaction and φv 0 values suggest the dominance of solute-solvent interaction. The limiting apparent molar volume transfer (Δtrφv 0) values have been found negative for NaCl and KCl in (0.03 and 0.045) and (0.03, 0.045 and 0.06) mol.kg-1 aqueous ciprofloxacin solutions respectively, which suggest the existence of ion-hydrophobic and hydrophobichydrophobic group interaction. But Δtrφv 0 values are positive for glucose and NaCl in (0.03, 0.045 and 0.06) and 0.06 mol.kg-1 aqueous ciprofloxacin respectively, which suggest the existence of ion-hydrophilic and hydrophilic-hydrophilic interactions. The values of limiting apparent molar expansion (Eφ 0) are positive. The Hepler constant (δ2φv 0/δT2)p values are small negative for all studied glucose, NaCl and KCl suggest the studied systems act as structure makers. The values of partial molar volumes ( 2) increase with increasing concentration of glucose, NaCl and KCl for all studied systems. The sound velocity increases with the increase of concentration of glucose, NaCl and KCl. Sound velocities of glucose, NaCl and KCl in aqueous ciprofloxacin solutions are higher than those of glucose, NaCl and KCl in aqueous solution. This indicate that the increase of compactness of the medium with the increase in glucose, NaCl and KCl and ciprofloxacin concentration. The adiabatic compressibility (βs) decreases with the increasing concentration of glucose, NaCl and KCl. This indicates that water molecules around the glucose, NaCl and KCl are less compressible than the water molecules in the bulk solution. The negative apparent molar adiabatic compressibility (φk) values indicate the greater loss of structural compressibility of water. The values of limiting apparent molar adiabatic compressibility (φk 0) are negative. The values of apparent molar adiabatic compressibility transfer (Δtrφk 0) are mainly positive which suggest the existence of strong ion-solvent interaction. At lower concentration, negative values of Δtrφk 0 indicate that increase in hydrophobic-hydrophobic group interactions. The small Sk values also indicates the domination of solute-solvent interaction over solute-solute interaction. The acoustic impedance, Z increases with the increase of concentration of glucose, NaCl and KCl. The relative association, RA decreases linearly with increasing the concentration of solute indicates the increase of solute-solvent interaction. The positive hydration number (nH) values indicate an appreciable solvation of solutes.Item Effect of tri-Potassium citrate on the Structure of Sucrose and Maltose in Solutions at Different Temperatures: Volumetric and Ultrasonic Studies(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2018-09) Sarkar, Subhas Chandra; Motin, Prof. Dr. Md. AbdulA volumetric and sound velocity method was used for the analysis of effect of tri- Potassium citrate (TPC) on the structure of sucrose and maltose. Densities and sound velocities of sucrose and maltose in water and in aqueous 0.05 mol.kg-1, 0.20 mol.kg-1, 0.35 mol.kg-1 and 0.5 mol.kg-1 (TPC) solutions have been studied at 293.15K to 313.15K with an interval of 5K. From density values, various parameters such as apparent molar volume (φv), limiting apparent molar volume (φv 0), limiting apparent molar volume transfer (Δtrφv 0), apparent molar expansibilities (δφv 0/δT)p and Hepler’s constant have been calculated. The acoustic properties such as adiabatic compressibility (βs), apparent molar adiabatic compressibility (k), limiting apparent molar adiabatic compressibility (φk 0), apparent molar adiabatic compressibility of transfer (Δtrφk 0), acoustic impedance (Z) and hydration number (nH) have been calculated by densities sound velocities data. The densities increase with the increase of concentration of sucrose and maltose. Densities of sucrose and maltose in aqueous TPC solutions are higher than that of sucrose and maltose in pure water solution. The apparent molar volume varies upon the disaccharides (sucrose and maltose) concentration as well as on the temperature. The smaller values of experimental slope (Sv) as compared to limiting apparent molar volume (φv 0) values suggest the dominance of solute-solvent interaction over the solute-solute interaction. The true volume (φv 0) of disaccharides are found to be order of: maltose > sucrose. The limiting apparent molar volume transfer (Δtrφv 0) values of sucrose and maltose are positive which suggest the dominance of ion-hydrophilic and hydrophilic-hydrophilic interactions over the hydrophobic-hydrophobic and ion-hydrophobic interactions. The Δtrφv 0 values increase with an increase in concentration of the TPC which indicates the presence of strong ion-hydrophilic interactions in the mixtures. The values of limiting apparent molar volume expansion (δφv 0/δT)p are positive. Hepler’s constant values are positive or small negative for all studied disaccharides in binary and ternary system suggest the studied systems act as structure maker. The values of partial molar volumes (V2) increase with increasing of concentration of sucrose and maltose for the studied systems. The sound velocity increases with the increase of concentration of sucrose and maltose. Sound velocities of disaccharides in aqueous TPC solutions are higher than that of disaccharides in pure water solution. This indicate that the increase of compactness of the medium with the increase in disaccharides and TPC concentration. The adiabatic compressibility (βs) decreases with the increase of concentration of disaccharides. This indicates the water molecules around the disaccharides are less compressible than the water molecules in the bulk solution. The negative k values indicate the greater loss of structural compressibility of water. The positive Δtrφk 0 values for all the saccharides indicate the presence of ionic-hydrophilic and hydrophilic-hydrophilic interactions. The small Sk values also indicates the dominating of solute- solvent interactions over solutesolute interaction. The acoustic impedance, Z increases with the increase of concentration of disaccharides indicates the presence of effective solute-solvent interactions. The hydration number (nH) decrease with the increase of concentration and temperature for both binary and ternary systems. The positive hydration number (nH) values indicate an appreciable solvation of solutes. Hydration capacity of maltose is higher than sucrose in water and in aqueous TPC solution.Item Zn and Cu Co-Doped Li4Ti5O12 Anode Material for Lithium Ion Batteries(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2019-06-15) Hasan, Md. Mehedi; Yousuf, Prof. Dr. Mohammad AbuLithium-ion batteries have been advanced the battery technology because of their prevalent power sources for electric vehicles and portable electronics devices. Spinel structure of lithium titanium oxide Li4Ti5O12 (LTO) has commended significant interest as an anode material for lithium-ion batteries because of several advantages such as high energy density, high safety, good chemical stability, long-life time, a flat operating voltage about 1.55 V and low cost. Modification of the surface structure of LTO based anode material by Cu and Zn has been significantly enhanced the conductivity of the electrode material by suppressing the decomposition of the electrode material and influencing their phase structure in some cases. Advanced spectroscopic techniques, such as Fourier-Transform Infrared Spectroscopy (FTIR), scanning electron microscopy (SEM), (EDX) and X-ray diffraction (XRD) are applied for the characterization of morphology, particle size and crystal structure of the prepared LTO based anode materials. In the finger print region sharp low frequency characteristic IR bands observed below 800 cm-1 which can be attributed to the symmetric stretching vibrations of Ti-O bonds of TiO6 octahedron in pure Li4Ti5O12, Li4Ti4.9Cu0.05Zn0.05O12, Li3.9Ti5Cu0.05Zn0.05O12 and Li3.9Ti4.9Cu0.1Zn0.1O12. At the same time strong stretching bands at around 2360.87, 2341.58 and 2331.94 cm-1 can be assigned to the Ti-O-Ti bonds in the prepared LTO and LTO based anode materials and corresponds to the published results. Li4Ti5O12 possess a face-centered cubic spinel structure grounded on space group symmetry of Fd3m. In the Li4Ti5O12 spinel structure, tetrahedral 8a sites are completely taken up by Li and the octahedral 16d sites are arbitrarily occupied by Li and Ti with an atomic ratio of 1:5 in a cubic close-packed oxygen array. The characteristic X-ray diffraction peaks of the prepared samples are found at 2θ of 18.3, 35.58, 43.2449, 43.1, 57.2065, 62.8447, and 66.1006 which correspond to the planes (111). (311), (400), (333), (440) and (531), respectively. The lattice parameter values were calculated for Li4Ti5O12, Li4Ti4.9Cu0.05Zn0.05O12, Li3.9Ti5Cu0.05Zn0.05O12 and Li3.9Ti4.9Cu0.1Zn0.1O12 and the values are 8.3692 Å, 8.3742 Å, 8.3834 Å and 8.3709 Å, respectively. XRD spectra that both pure Li4Ti5O12 and Cu & Zn co-doped LTOs showed peaks representing single phase of spinel lithium titanium oxide (cubic phase, space group Fd-3m) which are in good agreement with Joint Committee on Powder Diffraction Standards, JCPDS (No. 26- 1198) data. SEM photographs of prepared pure LTO (Li4Ti5O12), Li4Ti4.9Cu0.05Zn0.05O12, Li3.9Ti5Cu0.05Zn0.05O12 and Li3.9Ti4.9Cu0.1Zn0.1O12 possess chips like shape. No significant change happened in the morphologies due to the co-doping of different ratio of Cu & Zn into Li4Ti5O12. The morphologies of all prepared LTOs are almost same that correspond the X-ray diffraction result.Item Synthesis, Characterization and Structural Optimization Using Density Functional Theory of Hydrazone Schiff Base Derivatives(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2019-01) Hossain, Md. Zakaria; Badal, Prof. Dr. Md. Mizanur RahmanThis thesis paper is related in an effective method for the addition of 2,4-dinitrophenyl hydrazine and various substituted 2,6-dibenzylidene cyclohexanone based bis-chalcones in the presence of hydrochloric acid to produce various hydrazone Schiffbase derivatives. First product, N[2,6bis(4:chlorobenzylidene)cyclohexylidene]-N'-(2,4-dinitrophenyl)-hydrazine has been synthesized by the reaction of 2,4-dinitrophenyihydrazine with 2,6-bis-(4-chlorobenzylidene)-cyclohexanone at reflux conditionat 2 hours. The isolated product was red in color and the melting point of the pure product was 185 °C. Second synthesized product. N-[2,6-bis-(4-methoxy-benzylidene)-cyclohexylidene]-N'-(2,4-dinitrophenyi)-hydrazifle has been synthesized by the reaction of 2,4-dinitrophenyl hydrazine with 2,6-bis-(4-methoxybenzylidene)-cyclohexanone at the same condition. The pure product was coffee color and the melting point of the pure product was 225 °C. Final product, N-[2,6-bis-(4-dirnethylamino-benzylidene)-cyclohexylidene]-N'-(2,4-dinitrophenyl)-hydrazifle has been synthesized by the reaction of 2,4-dinitrophenyihydrazine with 2,6-bis-(4-dimethylbenzylidene)-cyclohexanone also at the same condition. The product of the color was black and the melting point of the pure product was 245 °C. The structures of the synthesized products were characterized by their physical, UV, FTIR, 'H NMR & '3C NMR spectra. Their optimized structures have been investigated by computational method, Gaussian 16 software Revision B.01. Their molecular geometry and vibrational frequencies were computed at density functional theory, DFT-133LYP/6-3 1 1+G (2d, p) level of theory.Item Graphene Oxide Modified Pencil Graphite Electrode for the Detection of H2O2(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2018-06) Mistry, Joyanta; Jamal, Dr. A. B. M. MamunIn this work, we propose a new, robust and reliable way to detect H2O2. Reduced graphene oxide-supported tin oxide (SnO2-rGO) as electrochemical sensing material has been synthesized and drop cased on pencil graphite electrode (PGE) for the detection of H2O2. Electrochemical characterization has been done using cyclic voltammetry (CV) and amperometry. Hydrothermal synthesis method was used for the fabrication of SnO2 nanoparticles and GO prepared by modified Hummers method. For the detection of H2O2, the nanoparticles were mixed with Nafion and chitosan before drop coating onto the PGE surface. In this work, we have found a good catalytic activity of SnO2-rGO modified 3B PGE at pH 7.4. Electrochemical studies showed that the sensing platform fabricated using SnO2-rGO possesses fast mass transport, good electrical conductivity and high sensitivity and selectivity for the detection of H2O2. SnO2- GO/PGE exhibited amperometric sensitivity of 53.4 μAmM−1cm-2 with a response time 2s, limit of detection of 0.09μM (n=3), and linearity range of 1-7 mM. The electrode can be prepared simply and at low cost, and present a promising tool for sensing H2O2.Item Low-Cost Rechargeable Battery Using Pencil Graphite as Ion Intercalation / De-Intercalation Electrode(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2018-06) Islam, Md. Jahidul; Jamal, Dr. A. B. M. MamunRemarkable improvement in utilizing renewable energy has pioneered to a critical demand for the large-scale energy storage system considering cost, safety and environmental aspect. Zn/Al-ion batteries are eco-friendly and advantageous over acid or alkali-based batteries as it is possible to utilize Zn metal as the negative electrode in aqueous medium. Here a Zn/Al-ion battery is developed using Pencil graphite, coated with graphene by cyclic voltammetry (CV), as the positive electrode and Zn metal as the negative electrode in an aqueous AlCl3/Zn(CH3COO)2 (0.5/0.5M) electrolyte. The Zn/Al-ion cell shows average discharge voltage plateaus around 1.0 V which offers a specific cathode capacity of ~54.1 mAh g−1 at a constant current density of 55 mA g−1 and exhibits capacity retention of more than ~95.8% over 100 cycles without any formation of dendrite at the negative electrode (Zn). Reversible Al3+ or [Al(H2O)6]3+ ion intercalation/de-intercalation storage process involving graphene coated pencil graphite (positive electrode) during charge-discharge cycling is proposed on the basis of CV, Electrochemical impedance spectroscopy (EIS), Scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX) analysis.Item Studies on Heavy Metals in Fruits of Samta Village of Jessore in Bangladesh(Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh, 2015-12) Rahim, Md. Abdur; Morshed, Prof. Dr. Mohammad HasanVarious fruits such as Mango (Mangifera indica L.), Jackfruit (Artocarpus heterophyllus L.), Guava (Psidiun guajava L.), Hog plum (Spondias dulcis L.), Carambola (Averrhoa carambola L.), Pomelo (Citrus grandis L.), Lemon (Citrus limon), Wax apple (Syzygium samarangense), Papaya (Carica papaya L.), Coconut (Cocos nucifera L.) and Sapodilla (Manilkara zapota) were collected from Samta village of Jessore district of Bangladesh, and screened for arsenic, manganese, lead, cadmium and chromium by Atomic Absorption Spectrophotometer (AAS). The average moisture contents in soil and fruits were found 11.90±0.19% and 80.10±12.92% respectively. The mean concentration of arsenic in irrigation water, soil and fruits were 0.51±0.17mg/L, 8.40±1.73mg/Kg and 0.206±0.14mg/Kg respectively. Maximum concentration of arsenic in irrigation water, soil and fruits were monitored 0.78mg/L, 11.31mg/Kg and 0.53mg/Kg respectively. Minimum concentration of arsenic in fruits was 0.10mg/Kg. In case of irrigation water, arsenic concentration was higher than that of standard (0.100mg/L) value of Bangladesh. The concentrations of arsenic in soil and fruits were observed somewhat less than that of standard value recommended by WHO. The average concentrations of manganese in irrigation water, soil and fruits were found 0.10±0.03mg/L, 269.14±20.71mg/Kg and 4.96±4.28mg/Kg respectively. The maximum concentration of manganese in soil and fruits were 296.82mg/Kg and 12.83mg/Kg respectively which were lower than that of standard value recommended by WHO, EU and BADC. The presence of lead, cadmium and chromium was not found in water, soil and fruits in this study area. In our research, 120 people were monitored for calculating the consuming of arsenic and manganese through daily intake of fruits and their health risk factor was analyzed. The average age, body weight and daily intake of fruits per person per day were 35.04±14.55 year, 60.77±8.62Kg and 263.20±166.73g respectively. Average 0.0018mg of arsenic and 0.055mg of manganese was consumed in each person (61Kg body weight) per day which was lower than WHO standard for arsenic (0.002mg/Kg body weight) and manganese (0.033mg/Kg body weight) intake for human body.