The Maramures region, located in North-Western Romania, was a renowned center of mining and smelting in the last century. Nowadays, all the mines have been decommissioned or are under conservation and greening works, but the acidic waters from some closed or abandoned mine galleries negatively affect the nearby streams and, in some cases, the entire river system. In this study, 46 elements and 6 anion concentrations were used to assess the pollution in 12 mine water discharge samples collected in two mining areas in Maramures. The results showed high concentrations of sulfate (average 1264 mg/L) and toxic elements, namely Mn (average 25.1 mg/L), Fe (average 23.0 mg/L), and Zn (average 12.5 mg/L). The sum of the REEs concentration ranged from 1.24 µg/L to 2917 µg/L, with an average of 363 µg/L, with La, Ce, and Nd being the most abundant. High correlations were found between REEs and Li, Be, Al, Sc, V, Mn, Fe, Co, Ni, Y, SO₄²⁻, and NO₂⁻. According to the pollution index, the discharge of mine water poses different degrees of ecological risk. The health hazard index calculated for 37 elements revealed an extremely high non-cancer risk and, in addition, an increased carcinogenic risk for Cd, As, and Cr.

This study analyzed the health risks associated with the consumption of certain vegetables (carrot, onion, tomato, and pepper) grown in soils potentially polluted with metals (Cd, Cu, Mn, Ni, Pb, Zn) and metalloids (As) from 15 vegetable gardens in the Sasar locality. The research includes measurement of soil and plant metal concentrations, assessment of global pollution of soils with metals using Nemerow pollution index (PI_N), calculation of the metal transfer factor (TF) from soil to vegetable, daily intake of metal dose (DIM) and health risk index (HRI) for both children and adults. The results (mean of 3 replicas ± standard deviation) show that the soil is moderately polluted with lead (28.39 ± 8.623 mg kg⁻¹), nickel (23.17 ± 4.043 mg kg⁻¹), and zinc (123.20 ± 26.918 mg kg⁻¹), strongly polluted with copper (71.68 ± 22.463 mg kg⁻¹), and cadmium (2.63 ± 0.881 mg kg⁻¹). Copper exhibited the highest transfer factors (>0.08), followed by cadmium (~0.06), while zinc and nickel showed moderate values (0.02–0.03). Arsenic and manganese had relatively stable and lower levels, whereas lead displayed the lowest transfer rates (<0.01) across all vegetables. Although the calculated health risk index (HRI < 1) remains below the critical threshold, the findings emphasize the importance of moderate consumption and continuous monitoring of crops in polluted areas. The results can contribute to the integration of sustainable development principles into community policy, protecting the environment and ensuring the sustainable health of consumers.

Spent portable batteries belong to the category of hazardous waste, sometimes dumped together with non-hazardous municipal waste in landfills, resulting in various aquatic environments. Their presence in the aquatic environment leads to changes in its quality and its contamination with heavy metals or other toxic elements. This paper highlights the portable battery waste’s influence on the aquatic environment in stagnant conditions. Therefore, three types of batteries and three solutions with different pH values were used to represent the possible media existing in nature: acid (pH = 4.00), rainwater (pH = 5.63), and alkaline (pH = 8.00). After 180 days, the results showed changes in the chromatics and composition of the initial solutions. The analyses showed decreased pH, increased conductivity, and the transfer of several heavy metals into solutions (Cu, Pb, Zn, Ni, and Fe). Thus, there were slight exceedances of the maximum allowed values for water quality class I (Order no. 161/2006) in the case of Cu and Pb and higher exceedances in the case of Zn, Ni, and Fe. Zinc–carbon batteries stand out because of the release of Pb and Fe ions. The same applies to lithium manganese dioxide batteries because of Ni ions as well as zinc–manganese alloy batteries because of Cu and Zn ions. Altogether, the negative influence of spent batteries on the aquatic environment is noticed, and the measures for the implementation of safe disposal and processing are necessary.

This study highlights the influence of the quantity on the rainfall and air temperature recorded at the hydrographic station Ulmeni (in the Maramures County, in the N-W part of Romania), on the Someș River flow rate and some general physico-chemical parameters (pH, total dissolved solids and suspended matter). Someș River is a left tributary of the Tisa River on the Hungarian territory, and is part of the Someș- Crasna hydrographic catchment, summing 5528 km network length coded, who drains an area of 15740 km2. Interpretation of the collected data and statistical processing has demonstrated that the fluctuations of the flow rate of the river are closely dependent on the seasons from the considered period (2004-2012) and correlations between hydrological and chemical parameters. Because a large part of the Someș River crosses the human settlements and important agricultural areas, the study may be useful in the prediction of flooding and drought risks.