https://eqa.unibo.it/issue/feed EQA - International Journal of Environmental Quality 2022-08-21T00:00:00+02:00 Gloria Falsone eqa@unibo.it Open Journal Systems <p><strong>EQA – ISSN 2281-4485</strong> is an international, multidisciplinary and peer-reviewed journal that encourages high-quality submissions of original research or brief reviews and analyses dealing with the aspects concerning soil, water and air quality and the sustainable use of these environmental resources.</p> https://eqa.unibo.it/article/view/14871 Analysis of a comprehensive monthly dataset on nitrogen, phosphorus and organic carbon in the Venice lagoon waters (Italy) 2022-05-13T10:43:17+02:00 Massimo Berti massimo.berti@thetis.it Francesca Scardia massimo.berti@thetis.it Claudio Carrer massimo.berti@thetis.it Francesco Sorrentino massimo.berti@thetis.it <p>Data on dissolved nitrogen, phosphorus and organic carbon concentrations recorded in the waters of the Venice Lagoon, covering a period spanning from 2007 to 2019, has been subjected to statistical analysis meant to evaluate seasonality, spatial variability and trends. The analysis revealed the role of the complex morphology, hydrological features and anthropogenic sources in determining the water quality and the dynamics of the ecosystem. Long-term trends were in line with the picture of the general enhancement of the chemical status of the lagoon observed in the last decades. Further improvements might be achieved dealing with the issues of the untreated effluent discharge in the canals of the urban centre and the agriculture fertilisers coming from the drainage basin and transported by the freshwater tributaries. The collection of such temporal data series has revealed the effectiveness to detect both short and long-term changes in the water quality. The maintenance of such temporal data series will be a useful tool for evaluating future changes arising from the climate change.</p> 2022-08-21T00:00:00+02:00 Copyright (c) 2022 Massimo Berti, Francesca Scardia, Claudio Carrer, Francesco Sorrentino https://eqa.unibo.it/article/view/14533 Changes in soil properties influenced by irrigation in an Alfisol of Northern Guinea Savanna of Nigeria 2022-03-09T14:24:21+01:00 Jamila Aliyu jamilabintaliyu@gmail.com <p>This article analyses the impact of irrigation on soil physical and chemical properties of the soils of the Galma river basin in Nigeria. Two profile pits were sited on irrigated and rain-fed fields respectively. Soil samples were collected from two depths. The soils were prepared and analysed for routine soil physical and chemical properties following a standard procedure. Quantitative data obtained from routine soil physical and chemical analysis were subjected to a T-test. The result of the analysis revealed that all the land use types locations show significant variation for sand, silt, and clay. The sand and silt show a highly significant different (p&lt;0.001) across location compared with clay which shows significant variation (p&lt;0.05). Bulk density, particle density, total porosity, and saturation index did not differ significantly across the land use types. Soils in irrigated fields showed significantly higher organic carbon, total nitrogen, calcium, and CEC but lower pH compared to soils under rainfed land-use type. Soils Under rain-fed land use had a statistically significant higher pH than soils under the irrigated land-use type. In contrast, differences in the distribution of soil available phosphorus, Na, exchangeable acidity and base saturation values among the two land-use types were statistically insignificant.</p> 2022-08-23T00:00:00+02:00 Copyright (c) 2022 Jamila Aliyu https://eqa.unibo.it/article/view/14554 Spatial distribution and relative enrichment of some upper-group trace elements in rhizosphere of highly anthropized and rapidly developing tropical environment 2022-03-13T11:57:55+01:00 Andrew Tyopine andrew.tyopine@funai.edu.ng Sunday Obalum sunday.obalum@unn.edu.ng Charles Igwe charlie.igwe@unn.edu.ng Chukwuma Okoye chuma.okoye@unn.edu.ng <p>Most upper-group (Groups 13-17) trace elements, some of which are micronutrients, are toxic. Soil concentrations, distribution and relative enrichment of ten of these elements were studied at Ikwo, southeastern Nigeria, representing largely disturbed and rapidly evolving humid tropical ecosystems. Sampling was from the 0-50-cm soil layer of fallow lands in the four cardinal zones (with marked agricultural/mining activities) and a reference central zone. Elemental concentrations were determined using Inductively Coupled Plasma Atomic Emission Spectroscopy. Enrichment factor was calculated as the ratio of each element to that of Fe (a reference element) in the soil. The central and north zones had the highest and lowest concentrations (21.00-10.75, 1.83-0.93, 10.90-5.58, 4.05-2.05, 4.97-2.54, 2.20-1.12, 17.75-9.09, 26.74-13.69, 4.41-2.26 and 1.89-0.96 mg kg<sup>–1</sup>, respectively for Se, As, B, Al, Si, S, Sn, Sb, I and Br), implying that mining/agricultural activities rather reduced their accumulation in the rhizosphere. Enrichment factors indicated extreme-to-significant levels in the soils for five of the elements (Si &gt; Sb &gt; B &gt; Al &gt; Se) and moderate-to-insignificant levels for the rest (Br &gt; Sn &gt; I &gt; S &gt; As). However, the elements showed similar distribution/enrichment patterns across the five zones including the reference zone. These patterns together suggest greater dependence of the enrichment levels of especially those with extreme-to-significant enrichments on the relative abundance of the elements in the earth’s crust than on the mining/agricultural activities in the agroecosystem. Thus, these activities at their current modes and intensities in the humid tropics apparently may not constitute any ecological risks.</p> 2022-08-21T00:00:00+02:00 Copyright (c) 2022 Andrew A. Tyopine, Sunday Obalum, Charles A. Igwe, Chukwuma O.B. Okoye https://eqa.unibo.it/article/view/14911 Models of water quality index for monitoring of available drinking bottled water consumed within Jalingo municipal 2022-05-18T14:54:05+02:00 Salihu Munta muntjen2000@gmail.com Abednego James muntjen2000@gmail.com Joseph Munta James muntjen2000@gmail.com <p>This study was carried out to develop a model of water quality index to be used for quality control of available bottled water consumed within Jalingo municipal. Six (6) different products of available bottled drinking water samples were obtained from Jalingo main market. The parameters of this bottled water were analyzed in the Environmental Laboratory of Taraba State Water Supply and Sewage Corporation (TAWASCO) Headquarters, Jalingo. Results of the analysis showed that values of temperature of all the six bottled water samples have exceeded the permissible value, but has no health implication, while results for turbidity, pH, Dissolved oxygen and electrical conductivity values were below the permissible limit. Results gotten from the analysis, through appropriate equations and the use of Minitab 19, were used to determine Water Quality Index (WQI) of the bottled water samples and it was observed that BW<sub>3</sub> had a water quality status of excellent and BW<sub>2</sub> and BW<sub>4</sub> had good as the water quality status while BW<sub>1</sub>, BW<sub>2</sub> and BW<sub>6</sub> had water quality status as poor. The model equation has a reliability (R<sup>2</sup>) of 90.3% and error of 9.7%. The experimental values of the water quality index were compared with those from the model equation and the results showed there were very little errors ranging from 0.00 to 0.48; indicating that there was a significant agreement between the values of WQI obtained by experiments and the ones from model equation. Finally, it was concluded that, in terms of both water quality index/parameters, the various bottled water samples are safe and fit for consumption and the equation could be employed for quality control of the available bottled water consumed within the confined of this study.</p> 2022-08-21T00:00:00+02:00 Copyright (c) 2022 Salihu Munta, Abednego James, Joseph Munta James