Statistical analysis of trends in organic pollution and pollution by nutrients at selected Danube river stations

Jarušková, Daniela; Liška, Igor

doi:10.1039/c0em00376j

Cited by 6 publications

(4 citation statements)

References 24 publications

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“…On a global scale, pathogenic contamination of surface water poses the most significant health risks to humans and there are countless numbers of waterborne outbreaks due to untreated or poorly treated water [9]. According to [10], the riparian states should play a central role in shaping the physico-chemical and biological environment of the Danube River Basin which is always experiencing fluctuations in the organic and mineral content as presented in Figures 2-8.…”

Section: Discussionmentioning

confidence: 99%

An Ecological Assessment of the Pollution Status of the Danube River Basin in the Galati Region—Romania

Ajeagah¹,

Cioroi²,

Praisler³

et al. 2013

JWARP

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Physico-chemical parameters and bio-contamination assessment through protozoan cysts and helminths eggs were carried out from the period of June to September 2010 in order to appreciate the pollution of the Danube River Basin in Romania. It recorded a higher tenor in Magnesium ion (60 mg/L) with respect to the calcium ion (20 mg/L). Other ions identified at substantial proportions were iron (1.459 mg/L), manganese (6.583 mg/L), phenol (12.780 mg/L) and Aluminium (0.0441 mg/L). Twenty one ciliated protozoa were identified in our analysis of water in the Danube River. Prominent was the presence of Caenomorpha medusula and Metopus ovatus which are indicators of polysaprobity. Resistant forms of enteropathogenic protozoa were present in our samples. These are Cryptosporidium sp (65 oocysts/l in August), Entamoeba histolytica (22 cysts/L in September), Giardia sp with 30 cysts/L in August. The helminths identified were Ascaris lumbricoides, Clornochis sinensis, Diphyllobothium latum, Enterobius vermicularis, Heterophrys heterophrys, larva of strongiloides stercoralis and Taenia sp. There is a low impact of natural depollution mechanisms which can functionally reduce the impending effect of the communicable diseases that are being transmitted by humans who constantly explore this aquatic medium during their leisure or economic activities.

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Section: Discussionmentioning

confidence: 99%

An Ecological Assessment of the Pollution Status of the Danube River Basin in the Galati Region—Romania

Ajeagah¹,

Cioroi²,

Praisler³

et al. 2013

JWARP

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“…26,27 Trend analyses were undertaken on both non owadjusted orthophosphate-P concentrations (representing the inuence of both hydrological and non-hydrological factors) and ow-adjusted orthophosphate-P concentrations (representing non-hydrological factors only), following Hirsch et al 29 and Jaruskova and Liska. 30 Human related activity may account for a proportion of the latter. 31 For the ow-adjusted analyses, temporal trend analyses were undertaken on residuals obtained from ordinary least squares linear regression of orthophosphate-P concentration vs. ow.…”

Section: Temporal Trend Statistics and Load Estimation Algorithmsmentioning

confidence: 99%

Orthophosphate-P in the nutrient impacted River Taw and its catchment (SW England) between 1990 and 2013

Tappin

Comber

Worsfold

2016

Environ. Sci.: Processes Impacts

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Excess dissolved phosphorus (as orthophosphate-P) contributes to reduced river water quality within Europe and elsewhere. This study reports results from analysis of a 23 year (1990-2013) water quality dataset for orthophosphate-P in the rural Taw catchment (SW England). Orthophosphate-P and river flow relationships and temporal variations in orthophosphate-P concentrations indicate the significant contribution of sewage (across the catchment) and industrial effluent (upper R. Taw) to orthophosphate-P concentrations (up to 96%), particularly during the low flow summer months when maximum algal growth occurs. In contrast, concentrations of orthophosphate-P from diffuse sources within the catchment were more important (>80%) at highest river flows. The results from a 3 end-member mixing model incorporating effluent, groundwater and diffuse orthophosphate-P source terms suggested that sewage and/or industrial effluent contributes ≥50% of the orthophosphate-P load for 27-48% of the time across the catchment. The Water Framework Directive (WFD) Phase 2 standards for reactive phosphorus, introduced in 2015, showed the R. Taw to be generally classified as Poor to Moderate Ecological Status, with a Good Status occurring more frequently in the tributary rivers. Failure to achieve Good Ecological Status occurred even though, since the early-2000s, riverine orthophosphate-P concentrations have decreased (although the mechanism(s) responsible for this could not be identified). For the first time it has been demonstrated that sewage and industrial effluent sources of alkalinity to the river can give erroneous boundary concentrations of orthophosphate-P for WFD Ecological Status classification, the extent of which is dependent on the proportion of effluent alkalinity present. This is likely to be a European - wide issue which should be examined in more detail.

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“…There are several scientific studies that analyzed individual parameters in the Danube and how they evolved over longer periods of time [30,31] and a number of studies that looked at the complex interaction between parameters [32] and between parameters and their drivers [33][34][35][36][37][38][39]. However, to support authorities and decision makers, and to communicate information to the public, an overall assessment of water quality can be a very useful tool.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Trends in Water Quality Indices in the Lower Danube and Tributaries in Romania (1996–2017)

Frîncu

2021

IJERPH

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The Danube River is the second longest in Europe and its water quality is important for the communities relying on it, but also for supporting biodiversity in the Danube Delta Biosphere Reserve, a site with high ecological value. This paper presents a methodology for assessing water quality and long-term trends based on water quality indices (WQI), calculated using the weighted arithmetic method, for 15 monitoring stations in the Lower Danube and Danube tributaries in Romania, based on annual means of 10 parameters for the period 1996–2017. A trend analysis is carried out to see how WQIs evolved during the studied period at each station. Principal component analysis (PCA) is applied on sub-indices to highlight which parameters have the highest contributions to WQI values, and to identify correlations between parameters. Factor analysis is used to highlight differences between locations. The results show that water quality has improved significantly at most stations during the studied period, but pollution is higher in some Romanian tributaries than in the Danube. The parameters with the highest contribution to WQI are ammonium and total phosphorus, suggesting the need to continue improving wastewater treatment in the studied area. The methodology and the results of the study may be very useful instruments for specialists and decision makers in updating river basin management plans and prioritising intervention measures.

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Statistical analysis of trends in organic pollution and pollution by nutrients at selected Danube river stations

Cited by 6 publications

References 24 publications

An Ecological Assessment of the Pollution Status of the Danube River Basin in the Galati Region—Romania

An Ecological Assessment of the Pollution Status of the Danube River Basin in the Galati Region—Romania

Orthophosphate-P in the nutrient impacted River Taw and its catchment (SW England) between 1990 and 2013

Long-Term Trends in Water Quality Indices in the Lower Danube and Tributaries in Romania (1996–2017)

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