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61.
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Concentration of heavy metals and natural gross radioactivity were measured in the surface water and sediment of Hazar Lake (Elazi?, Turkey). Eight sampling sites were pre-defined in different locations of the lake. A preliminary study on heavy metals (Zn, Fe, Mn, Ni, Cu, Cr, Co and Pb), major elements (Na, K, Ca, Mg) concentrations and natural radioactivity related to 226Ra, gross-alpha and gross-beta radiations in the surface water and deep sediments were determined. The obtained results showed that, in general, the heavy metals (Zn, Fe, Mn, Ni, Cu and Pb) and major elements (Na, K, Ca, Mg) concentrations in water did not exceed WHO (World Health Organization, 1999), EC (Europe Community, 1998), EPA (Environment Protection Agency, 2002) and TSE-266 (Turkish Standard, 1997) guidelines. Generally, heavy metals and major elements concentration of the sediments were found decrease in sequence of Fe>Mg>Ca>Mn>Zn>Ni>Cr>Cu>Co>Pb. The results of this study indicated that a general absence of serious pollution in the Hazar Lake. The results obtained from the radioactivity determination indicate that the surface water radioactivity concentration of 226Ra, gross-alpha and gross-beta were ranging from 0.52+/-0.02 to 2.02+/-0.06 Bq/l and from 0.65+/-0.03 to 2.52+/-0.07 Bq/l and from 0.01+/-0.01 to 0.14+/-0.01 Bq/l, respectively. Deep sediment radioactivity concentrations of 226Ra is ranging from 0.07+/-0.03 to 0.32+/-0.07 Bq/g. 相似文献
63.
Long-term effects of fertilization on the forms and availability of soil phosphorus in rice paddy 总被引:4,自引:0,他引:4
The changes in total P accumulation and P compounds with time in the plough layer in a paddy soil in southern Korea were investigated in relation to the continuous application of chemical fertilizers (NPK), straw based compost (Compost), combination these two (NPK+Compost) for 31 years. Continuous fertilization increased the total and inorganic P contents in plough layers. In NPK, inorganic P fraction did not change with time, but organic P content increased significantly. Long-term application of chemical fertilizer together with compost accelerated the decrease in the organic P fraction, presumably due to promoting microbial activity in the plow layer, and then increased significantly inorganic P fraction. Compost application decreased the residual P and Fe-P fractions and then increased inorganic P fraction, in spite of continuous compost application. Increase in total, inorganic and extractable P with time may be closely related to the increase in the availability of accumulated P for rice growth. 相似文献
64.
Adsorption kinetics of methyl violet onto perlite 总被引:11,自引:0,他引:11
This study examines adsorption kinetics and activation parameters of methyl violet on perlite. The effect of process parameters like contact time, concentration of dye, temperature and pH on the extent of methyl violet adsorption from solution has been investigated. Results of the kinetic studies show that the adsorption reaction is first order with respect to dye solution concentration with activation energy of 13.2 kJ mol(-1). This low activation energy value indicates that the adsorption reaction is diffusion controlled. The activation parameters using Arrhenius and Eyring equations have been calculated. Adsorption increases with increase of variables such as contact time, initial dye concentration, temperature and pH. 相似文献
65.
Estimation of total sediment load concentration obtained by experimental study using artificial neural networks 总被引:1,自引:0,他引:1
Estimation of sediment concentration in rivers is very important for water resources projects planning and managements. The
sediment concentration is generally determined from the direct measurement of sediment concentration of river or from sediment
transport equations. Direct measurement is very expensive and cannot be conducted for all river gauge stations. However, sediment
transport equations do not agree with each other and require many detailed data on the flow and sediment characteristics.
The main purpose of the study is to establish an effective model which includes nonlinear relations between dependent (total
sediment load concentration) and independent (bed slope, flow discharge, and sediment particle size) variables. In the present
study, by performing 60 experiments for various independent data, dependent variables were obtained, because of the complexity
of the phenomena, as a soft computing method artificial neural networks (ANNs) which is the powerful tool for input–output
mapping is used. However, ANN model was compared with total sediment transport equations. The results show that ANN model
is found to be significantly superior to total sediment transport equations. 相似文献
66.
Ho Ngoc-Ninh Do Truong Lam Tran Dinh-Thao Nguyen Trung Thanh 《Environment, Development and Sustainability》2022,24(1):156-179
Environment, Development and Sustainability - Eliminating ultra-poverty has received particular attention of policymakers and scholars. The ultra-poor in mountainous regions often live on... 相似文献
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Guo Rong Liu Hong-Mei Sun Hong-Hao Wang Dong Yu Hao Do Rosario Alves Diana Yao Lu 《Journal of Material Cycles and Waste Management》2022,24(6):2314-2327
Journal of Material Cycles and Waste Management - The massive generation of municipal solid waste (MSW) has become an essential social problem that not only damages the ecological environment but... 相似文献
70.
Squadrone Stefania Pederiva Sabina Bezzo Tabata Sartor Rocco Mussat Battuello Marco Nurra Nicola Griglione Alessandra Brizio Paola Abete Maria Cesarina 《Environmental science and pollution research international》2022,29(20):29529-29534
Environmental Science and Pollution Research - Microplastics are contaminants of great concern all over the world. Microplastics constitute pollutants themselves; moreover, other contaminants such... 相似文献