Spatial and seasonal variations of organic carbon level in four major rivers in Korea

Lee, Jaewoong; Shin, Kisik; Park, Changhee; Lee, Seung–Hyun; Jin, Dal Rae; Kim, Yong-Seok; Yu, Soonju

doi:10.4491/eer.2015.094

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…Monitoring the COD and TOC content is important in assessing the degree of water pollution with organic pollutants, these indicators providing information on the presence and rate at which organic pollutants affect the water body [19,20]. In the present study chemical oxygen demand ranged between 15.6 -26.8 mg O 2 /L (figure 2a).…”

Section: Resultsmentioning

confidence: 66%

Assessment of chemical parameters in the lower Danube

Cotloguț¹,

Topa²,

Timofti³

et al. 2018

Ann_UGAL_Math_Phys_Mec

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This paper aims at monitoring the water quality and the pollution degree on a relevant sector from the Lower Danube using the levels of nutrients, minerals, organic matters and the oxygen conditions as the specific indicators. For this study, water samples were taken from 5 different sampling stations: Priza Dunarii, the confluence of the Danube with the Siret and the Prut, Dunare-Liberatatea, and Cotul Pisicii. In order to determine the pollution degree of the Danube water in the adjacent area of Galati city, nine chemical parameters were analysed: total nitrogen, nitrates, nitrates, ammonia, total phosphorus, chlorides, sulphate ions, total organic carbon (TOC) and chemical oxygen demand (COD). The results obtained were used to assess and classify the quality of the Lower Danube water into quality classes according to the Water Framework Directive transposed in Order 161/2006.

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Section: Resultsmentioning

confidence: 66%

Assessment of chemical parameters in the lower Danube

Cotloguț¹,

Topa²,

Timofti³

et al. 2018

Ann_UGAL_Math_Phys_Mec

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“…In general, a strong correlation between BOD5 and COD may indicate an increase in biodegradable and non-biodegradable organic contaminants resulting from human activities (Lee et al 2016). In our study, although BOD5 and COD are not significantly correlated at 1% with most of the variables, these two parameters present a strong positive correlation between them (BOD5-COD correlation: rho = 0.81, 0.84, 0, 95 and 0.7, during the four seasons, i.e.…”

Section: Correlation Analysismentioning

confidence: 99%

The effect of organic pollution on the seasonal dynamics of water quality of Hammam Boughrara Dam that is located in a semi-arid zone in the northwestern city of Tlemcen (Algeria)

Rezak,

Bergane,

Bahmani

2023

Preprint

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The present study aims to assess the impact of human activities on the water quality of Hammam Boughrara Dam, while highlighting the importance of seasonal variations of the organic pollution indicator parameters. The COD/BOD5 Ratio (CBR) values, over the period mentioned above, revealed the dominance of two categories, namely Moderately Biodegradable Effluent (MBE) and Difficult to Biodegrade Effluents (DBE) or Non-Biodegradable Effluents (NBE), with significant seasonal variations. The MBE category showed a maximum frequency in autumn (29 occurrences) and a minimum frequency in spring (20 occurrences), while the DBE or NBE category had a maximum frequency of 26 during winter and a minimum frequency of 21 during the autumn season. The analysis of Organic Pollution Index (OPI) revealed that the water of the dam under study is strongly impacted by organic pollution, with significant seasonal variations. This is confirmed by the predominance of the Organic Pollution (OP) category, with a maximum frequency in autumn and summer seasons (25 occurrences) and minimum in spring (21 occurrences), as well as by the Very Strong Organic Pollution (VSOP) category, with a maximum frequency in winter (23 occurrences) and minimum in summer (11 occurrences). The box-plot graphs showed positive skew, while others exhibited a negative one, with significant seasonal variations in the InterQuartile Range (IQR). It should also be mentioned that the correlation of the Organic Pollution Index (OPI) with the concentrations of NH₄⁺ and PO₄³⁻ ions is higher than that of the OPI with BOD5 and NO₂⁻. However, it must be recognized that the correlation between the OPI and BOD5 as well as NO₂⁻ remains significant at 1% threshold level. Moreover, the correlation coefficients showed significant seasonal variations. It is worth noting that the OPI showed a positive correlation with the dam’s water volume, during all four seasons, with correlation coefficients varying significantly for each season. On the other hand, the OPI exhibited negative correlation with COD, TDS and \({NO}_{3}^{-}\) concentrations in some seasons. In addition, positive correlations were observed between the concentrations of \({NH}_{4}^{+}\)and \({PO}_{4}^{3-}\) ions, as well as between the concentrations of \({NH}_{4}^{+}\) and \({NO}_{2}^{-}\) ions, throughout the four seasons.

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