Abstract
Water and sediment samples of Jie River, China were collected and analyzed. The results showed that the average arsenic volume of water sample was 0.42 mg L-1 present in the Jie River. Among the riverway, the arsenic volume and pH kept rising with the flow. Standard leaching experiments showed the leachability of the sediments was lower than the hazardous materials permitted threshold volume but the leaching liquid exceeded the environmental quality standard for surface water which means the sediments might be a source to leach arsenic into aqueous system. In order to figure out the actual situation, simulated leaching experiments were performed. The results revealed that the sediments leaching could aggravate the water quality which was mostly influenced by the agitation and temperature. Solidification procedure was tested and suggested that with clean sand paved on the sediment, the amount of leaching arsenic will decrease 77.89%. Thus, it is of great help to apply cleaned sediments to remediate the contaminated sediments to reduce the leaching of arsenic into the aqueous system.
Highlights
Arsenic accumulation in river sediments has received great concern due to its high toxicity
The arsenic is ubiquitous in the rivers around the word[3], the average content of arsenic in river sediments is 5 mg kg-1
High concentration of arsenic in sediments poses great health threat to the human beings because the arsenic in sediment might leach into the aqueous system through desorption resulting in arsenic accumulation in aquatic life[4]
Summary
Arsenic accumulation in river sediments has received great concern due to its high toxicity. River sediments receive micro pollutants, trace metallic, and metalloid elements like arsenic[1]. The arsenic is ubiquitous in the rivers around the word[3], the average content of arsenic in river sediments is 5 mg kg-1. In some severe contaminated area such as mining area, the arsenic content in river sediments exceeds 200 mg kg-1. High concentration of arsenic in sediments poses great health threat to the human beings because the arsenic in sediment might leach into the aqueous system through desorption resulting in arsenic accumulation in aquatic life[4]. It is critical to estimate the risk of the arsenic occurrence amount in sediments to protect aquatic life and human health
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