Roveda L.F.,UNESPAR |
Cuquel F.L.,Federal University of Parana |
Motta A.C.V.,Federal University of Parana |
Melo V.F.,Federal University of Parana
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The use of industrial biosolids in the agriculture may increase nickel levels in the soil. However, bioavailability of nickel may be influenced by several factors and nickel-rich residuals are not often directly related to high absorption of this metal by the plants. This study aimed to evaluate the nickel solubility in the soil, its bioavailability and accumulation by the plants. An experiment was conducted using strawberries as experimental model. Those were planted in earthen pots filled with Inceptisol with four replications. A fully randomized design was developed and six doses of nickel were employed: 0, 9, 18, 36, 72 and 144 mg per kg-1 of soil. Two nickel sources were employed: composted biosolid (organic source) and nickel chloride (mineral source). Both soil and plant nickel levels (the latter including roots, crow, aerial parts and fruits) were evaluated by using the following extractors: nitric acid + hydrochloric acid solution (3:1), calcium nitrate solution (0.5 mol L-1), nitric acid solution (1 mol L-1) and sodium pyrophosphate solution (0.1 mol L-1). Te highest and lowest nickel levels were yielded by the use of organic source by the nitric acid + hydrochloric acid solution and calcium nitrate solution, respectively. Both organic and mineral sources increased nickel levels in the strawberries tissues, with small increases verified for the organic source. Te highest levels were found in the roots whereas the lowest were obtained in the crow.
Baptista V.A.,URI Integrated Regional University Brazil |
Antunes M.B.,Federal University of Santa Maria |
Martello A.R.,UNESPAR |
Figueiredo N.S.B.,Federal University of Santa Maria |
And 3 more authors.
Ambiente e Sociedade | Year: 2014
Neotropical rivers suffer effects of human actions. Conservation measures are based on data from other regions because few studies in this region and limnology knowledge. But it's often inability to realize differences in the environmental variables answer at different scales about aquatic communities. This study aimed: to know aquatic insects richness in a neotropical watershed to check the environmental variables influence on the distribution of aquatic insects families in four tributaries of this microbasin and to check the rate distribution pattern of aquatic insects families between different rivers orders and different microbasins, according to environmental and spatial variables influence. We found 9,135 individuals belonging to 26 macroinvertebrates families. The communities structure were differed between microbasins. The aquatic insects families were influenced by different spatial and environmental variables in each microbasin.
Reis C.S.,UNESPAR |
Franca H.T.S.,UNESPAR |
Motyl T.,UNESPAR |
Cordeiro T.S.,UNESPAR |
And 2 more authors.
Engenharia Sanitaria e Ambiental | Year: 2015
In this paper are present the results of spectrophotometric tests performed on water samples taken from the Guaraguaçú River located on the coast of Paraná State, Brazil. These tests were conducted to quantify the element phosphorus by the blue molybdenum method and the element nitrogen by Griess and indophenol methods. With these results it was possible to assess that this river has been suffering with anthropic activity in your surroundings. The results of phosphate are above the levels established in Resolution 357/2005 of CONAMA, and these results compared with those obtained in other river in the region are similar, hence we observe that this fact is not caused by human activity. Since the results of the concentrations of ammonium, nitrate and nitrite indicate that the values obtained are below the maximums established by that resolution, then we denote that the presence of the latter two ions in surface water occurs where anthropic activity is expanding. © 2015, ABES - Associacao Brasileira de Engenharia Sanitaria e Ambiental. All rights resevred.