Chronic Zinc Screening Water Effect Ratio for the H-12 Outfall, Savannah River Site

Coughlin, Deborah; Looney, B.B.; Millings, M.

doi:10.2172/946164

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…National Pollutant Discharge Elimination System (NPDES) permit development at the Savannah River Site (SRS), limits for Zn were proposed based on a simplified "recalculation" method. The recalculation was performed in 2007 resulting in a proposed limit for Zn of 153.2 µg/l [10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Doum Palm Seed Kernel as Natural Sorbent for Metal Ions Removal from Gombe Ternary Wastewater

Muhammad

Abdulkarim

Adamu

2019

PoS

View full text Add to dashboard Cite

Water pollution is one of the major challenges in cities and industrialized areas of the world. The effluent from Gombe ternary wastewater pollutes the surrounding waters thereby constituting health threat to the populace within its vicinity. In view of the above, a bio-sorption study of zinc and lead ions from Gombe ternary wastewater using doum palm seed kernel was carried out. The wastewater was characterized and was found to contain 0.03 mg/l lead metal ion and 0.81 mg/l zinc ion. The doum palm kernel bio-sorbent was obtained after oil extraction from the seed and processed as contained in the method mentioned in this paper. The kernel residue was characterized for functional groups using FTIR, surface morphology using SEM, surface area using BET, and elemental composition using XRF. The results indicated that the doum palm kernel is harmless, and possesses functional groups on its surface, which may be substituted with the metallic ions present in the wastewater. This gives the kernel the ability to adsorb positively charged ions on its surface by simple chemisorption. This mechanism is supported by the rough surface observed in the scanning electron microscopy. Adsorption and desorption of nitrogen was made at STP and the curve indicated very high correlation of close to unity. The surface area measured by multi BET method was recorded as 13.464 m 2 /g. This value is not high enough to adsorb metals by physical adsorption.

show abstract

Section: Introductionmentioning

confidence: 99%

Characterization of Doum Palm Seed Kernel as Natural Sorbent for Metal Ions Removal from Gombe Ternary Wastewater

Muhammad

Abdulkarim

Adamu

2019

PoS

View full text Add to dashboard Cite

show abstract

Water–effect ratio of copper and its application on setting site-specific water quality criteria for protecting marine ecosystems of Hong Kong

Bao

Lai

et al. 2017

Environ Sci Pollut Res

View full text Add to dashboard Cite

Generic water quality criteria (WQC) of a chemical are usually set based on results generated from toxicity tests which were conducted using standard laboratory water with well-controlled physiochemical properties. However, in natural aquatic environments, physiochemical characteristics, such as salinity, total suspended solid, total organic carbon and the co-existence of chemical contaminants, often vary spatially and temporally. These parameters can, in turn, alter the bioavailability of target chemicals and, thus, influence their toxicity to marine organisms. To account for site specificity, the US Environmental Protection Agency's water-effect ratio (WER = site water-LC50 / laboratory water-LC50) procedure can be applied to derive site-specific WQC. Most past studies, however, were conducted for freshwater systems. Here, for the first time, the WER of copper (Cu) was determined for three marine water control zones (WCZs) in Hong Kong: Victoria Harbour, Deep Bay and Southern WCZs. Samples of water were collected from three locations within each WCZ, while acute toxicities to the marine diatom Skeletonema costatum, intertidal copepod Tigriopus japonicus and larvae of marine medaka Oryzias melastigma were determined in site or laboratory (artificial seawater) waters. Results of this study showed that conservative final WER relative coefficients for Cu ranged from 0.57 to 0.73 for the three WCZs, and water from some locations caused >30% mortality in the fish larvae in the controls (without Cu addition). These results suggested that current generic WQC for Cu are likely under-protective for marine organisms in the three areas, and it should be tightened by multiplying it with site-specific WER to offer better protection to marine biodiversity and integrity of the ecosystem.

show abstract

Chronic Zinc Screening Water Effect Ratio for the H-12 Outfall, Savannah River Site

Cited by 2 publications

References 0 publications

Characterization of Doum Palm Seed Kernel as Natural Sorbent for Metal Ions Removal from Gombe Ternary Wastewater

Characterization of Doum Palm Seed Kernel as Natural Sorbent for Metal Ions Removal from Gombe Ternary Wastewater

Water–effect ratio of copper and its application on setting site-specific water quality criteria for protecting marine ecosystems of Hong Kong

Contact Info

Product

Resources

About