Seasonal and Spatial Variations of Heavy Metal Pollution in Water and Sediments of China’s Tiaozi River

Abstract

The objectives of this study were to investigate the seasonal and spatial variations of heavy metal pollution in the overlying water and surface sediments of the Tiaozi River, a tributary of the Liao River, which is one of the seven major rivers and one of the most heavily-polluted rivers in China. Water and sediment samples were collected over four seasons, analyzed for heavy metals (Pb, Cu, Ni, Mn, Cd, and Zn), and assessed with an integrated water quality index (WQI) and a geoaccumulation index (I geo). Results indicated that the maximum concentrations of all the metals in water and sediments occurred in winter and the minimum in summer. Assessment of the pollution indicated that the water was uncontaminated by heavy metals, but the sediments were slightly contaminated with Cu, Ni, Cd, and Zn. Therefore, the pollution of Cu, Ni, Cd, and Zn in the Tiaozi River Basin should be taken into account during the formation of regional management strategies for the water environment.

Seasonal Variations of Heavy Metal Accumulation in Water, Sediment and Target Organs of the Cichlid Fish, Oreochromis niloticus Inhabiting El-Bagouria Canal, El-Gharbia Governorate, Egypt

“…The fluctuations in manganese levels may be due to the variable amounts of effluent wastes which reached to the sampling stations. The present results were adapted to those recorded by Karadede-Akin (2007) and Pandey & Singh (2015), and differed with Daifullah et al (2003) who recorded the highest value of manganese during spring and Dong et al (2015) whose manganese peaked during winter.…”

Determination of Spatiotemporal Variations in Heavy Metal Concentration through Orontes River

“…Among them, heavy metals are primary environmental polluters due to their durability, bioaccumulation, nonbiodegradability and toxicity potential to living beings (Yılmaz and Doğan, 2008;Dong et al, 2015). Some heavy metals are tolerable in low concentrations due to their bio-chemical functions; yet, they all become toxic in higher concentrations since they cause damage to the nervous system and internal organs (Liu et al, 2009;Förstner and Prosi, 2013).…”

“…Therefore, monitoring and evaluating heavy metal concentrations in water bodies is a case-specific issue. Although different methodologies are employed for the evaluation of heavy metal concentration in literature (Verma and Gupta, 2015;Maanan et al, 2015;Tiwari et al, 2016), multivariate statistical methods become widely applied tools for these type of studies especially when huge and complex chemical data sets are of concern (Singh et al, 2005;Li et al, 2009;Dong et al, 2015;Varol, 2011). Also, the boxwhisker plot is used to identify basic statistical features of datasets through visual displays (Singh et al, 2005;Devic et al, 2015;Ogwueleka, 2015).…”

A Potential Toxicological Risk Assessment of Heavy Metals and Pesticides in Irrigated Rice Cultivars near Industrial Areas of Dhaka, Bangladesh

“…The toxicity of heavy metals arises from their persistence as environmental contaminants, characterized by resistance to destruction or alteration in their chemical composition. With global industrialization, the issue of environmental contamination by heavy metals has garnered increased attention, particularly human exposure through soil contamination (Dong et al, 2015). These metals can accumulate in human tissues from the consumption of fruits, crops, and vegetables grown in contaminated soil, leading to signi cant health risks.…”