A. Mashian Moradi; R. Golshani
Volume 2, Issue 4 , December 2012, , Pages 255-258
Abstract
Pesticides are used extensively in agricultural lands in Northern provinces of Iran which makes river ecosystems more vulnerable to pesticides pollution. This study was conducted in three river estuaries (Babolrud, Tajanrud and Gorganrud), focusing mainly on the concentration levels of organophosphate ...
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Pesticides are used extensively in agricultural lands in Northern provinces of Iran which makes river ecosystems more vulnerable to pesticides pollution. This study was conducted in three river estuaries (Babolrud, Tajanrud and Gorganrud), focusing mainly on the concentration levels of organophosphate pesticides (diazinon, malathion, azinphos-methyl) in the muscle tissue of golden mullet fish, an economically important and highly consumed fish in the region. The research was conducted in 2011-12. During the study, 27 samples of mullet fish were collected. After extraction and purification process, the average level of concentrations of diazinon, malathion in mullet fish muscle tissue were measured using Gas Chromatography. Based on the results, the highest average concentrations of azinphos-methyl belonged to samples taken from Babolrud river estuary (1.28 mg/kg), while these concentrations for Tajan and Gorganrud samples were respectively 0.76 and 0.04 mg/kg. The highest concentration of malathion in mullet fish muscle was found in the samples taken from Tajan River (0.19 mg/kg). The concentration of malathion in samples taken from Babolrud and Gorganrud rivers were also 0.17 and 0.07 mg/kg, respectively. The highest concentration of diazinon in mullet fish muscle was found in samples taken from Babolroud River (0.27 mg/kg), and then in samples from Tajan and Gorganroud rivers (respectively 0.09 and 0.08 mg/kg). It was concluded that the most contaminated river estuary was Babolrud river estuary.
P. Aberoomand Azar; Sh. Moradi; Sh. Piramoon; A. Mashinchian Moradi
Volume 1, Issue 1 , December 2011, , Pages 23-28
Abstract
TiO2 photo catalyst was prepared in presence of nano SiO2 and Hydroxy Propyl Cellulose (HPC) by sol gel method with Titanium Tetra IsoproPoxide (TTIP) as titanium precursor. Additional effect of HPC in preparation of nano catalyst, and photo catalyst properties measured and characterized by FT-IR, FT-Raman ...
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TiO2 photo catalyst was prepared in presence of nano SiO2 and Hydroxy Propyl Cellulose (HPC) by sol gel method with Titanium Tetra IsoproPoxide (TTIP) as titanium precursor. Additional effect of HPC in preparation of nano catalyst, and photo catalyst properties measured and characterized by FT-IR, FT-Raman and SEM. The catalyst size and structural properties of the film were determined by .-Ray Diffraction (.RD). The nano particles of TiO2/SiO2 with HPC contained anatase phase in advance. The surface area measured by the Brunauer, Emmett and Teller (BET) method. Presences of Ti and Si in the nano structure were confirmed by Scanning Electron Microscopy (SEM) equipped with Energy Dispersive .-ray (ED.) spectroscopy. Photo catalyst properties of TiO2/SiO2 examined at first for decomposition of Methyl Red as azo dye, and then for degradation of 5ppm diazinon solution as an organo phosphorous insecticide pollutant in marine source, (Caspian Sea water). Concentration of diazinon during of degradation by TiO2/SiO2 photo catalyst was monitored by UV-Vis spectrophotometery. The insecticide degradation occurred within 105 min of photocatalytic treatment.