William B. White and Elizabeth L. White (USA): their contributions to karst hydrogeology discussed in an interview

Goldscheider, Nico; Baker, P.; Wu, Yuexia; Groves, Chris

doi:10.1007/s10040-008-0337-7

Cited by 4 publications

(5 citation statements)

References 13 publications

(13 reference statements)

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“…All experiments were performed at least in triplicate. Breakthrough curves were then used to calculate recovered mass according to the following equation [32]:…”

Section: Column Experimentsmentioning

confidence: 99%

Retention and Transport of Nanoplastics with Different Surface Functionalities in a Sand Filtration System

Okutan,

Hul,

Stoll

et al. 2023

Nanomaterials

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The efficiency of sand filtration was investigated in terms of the behavior of the nanoplastics (NPLs) with different surface functionalities. The initial condition concentrations of NPLs were varied, and their effects on retention and transport were investigated under a constant flow rate in saturated porous media. The behavior of NPLs in this porous system was discussed by considering Z- average size and zeta (ζ) potential measurements of each effluent. The retention efficiencies of NPLs were ranked as functionalized with amidine [A-PS]+ > with sulfate [S-PS]− > with surfactant-coated amidine [SDS-A-PS]−. The reversibility of the adsorption process was revealed by introducing surfactant into the sand filter system containing adsorbed [A-PS]+ at three different initial state concentration conditions. The deposition behavior on sand grain showed that positively charged NPLs were attached to the quartz surface, and negatively charged NPLs were attached to the edge of the clay minerals, which can be caused by electrical heterogeneities. The homoaggregates made of positively charged NPLs were more compact than those made of negatively charged NPLs and surfactant-coated NPLs. An anti-correlation was revealed, suggesting a connection between the fractal dimension (Df) of NPL aggregates and retention efficiencies. Increased Df values are associated with decreased retention efficiencies.The findings underscore the crucial influence of NPL surface properties in terms of retention efficiency and reversible adsorption in the presence of surfactants in sand filtration systems.

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“…All experiments were performed at least in triplicate. Breakthrough curves were then used to calculate recovered mass according to the following equation [32]:…”

Section: Column Experimentsmentioning

confidence: 99%

Retention and Transport of Nanoplastics with Different Surface Functionalities in a Sand Filtration System

Okutan,

Hul,

Stoll

et al. 2023

Nanomaterials

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“…The main tributaries are: Vojskova, Rumin, Ruda, Zvizda, etc. The shallow karst aquifers of carbonate are characterized by heterogeneity and anisotropy in contact with surface water through the epikarst zone [21][22][23], as in the Dinaric karst [24][25][26][27][28]. Between horizontally and Vojskova, Rumin, Ruda, Zvizda, etc.…”

Section: Study Area Overviewmentioning

confidence: 99%

“…Between horizontally and Vojskova, Rumin, Ruda, Zvizda, etc. The shallow karst aquifers of carbonate are characterized by heterogeneity and anisotropy in contact with surface water through the epikarst zone [21][22][23], as in the Dinaric karst [24][25][26][27][28]. Between horizontally and vertically distant aquifers, between which there is no isolating factor, water flows under the influence of gravity through karst channels, microfractures, and macrofractures, resulting in opposing groundwater flows [24].…”

Section: Study Area Overviewmentioning

confidence: 99%

“…Figure 1 shows the entire study area and all sampling sites (Table S1 for description and codes). Water and sediment sampling was conducted at 35 representative sampling sites The CRB requires a transboundary approach to water resources management that includes protection, controlled use, and long-term sustainable management in terms of water availability and quality [26]. The two countries rely on a common groundwater resource, and have rights and obligations under the Water Convention and the Water Framework Directive.…”

Section: Study Area Overviewmentioning

confidence: 99%

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Geochemistry of Metals and Organic Matter in Water and Sediments of the Karst River Cetina, Croatia

Maldini¹,

Cukrov

Pikelj

et al. 2023

Water

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The Cetina River Basin (CRB) belongs to a Dinaric karst area (Croatia). According to the obtained results on water and sediment quality, the Cetina River reaches the sixth goal of Sustainable Development (source of drinking water). Together with the CRB water quality assessment, it was confirmed that sediments undoubtedly contribute to the purification of watercourses from trace metals as well as organic matter. In 5 years, water samples were collected at 20 sampling sites and sediment samples were collected at 18 sampling sites. The fresh water of the Cetina River belongs to the hydrocarbonate type due to its lithology. The concentrations of the measured elements in the sediments, normalized to Al, are an indicator of possible pressures affecting the ecosystem of the river. According to the Principal Component Analysis (PCA) for elements in sediments, Principal Component 1 (PC1) describes the geogenic origin of the elements, while Principal Component 2 (PC2) describes positive values reflecting anthropogenic pressures (Total Nitrogen, TN; and Total Phosphorus, TP). Depending on element composition, the factor scores related to PC1 and PC2 resulted in four different groups of sites. The first three groups of sediments showed geological impact, while the fourth group was partially anthropogenic in origin. The hierarchical cluster analysis showed four clusters in relation to the content of the elements. Cluster analysis of all elements and the Total Organic Carbon (TOC) in the sediments showed grouping in only two clusters, the first cluster consisting of Ca, and the second of TOC with other elements.

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“…However, due to the acceleration of industrialization and urban process, extensive mining activities are one of the main reasons for China's serious environmental problems [13,14]. At present, heavy metal mining pollution and ecological risks are the focus of China's water and soil protection, especially in the southwest [15][16][17], where special action needs to be urgently conducted due to its large-scale development and utilization of mineral resources, fragile ecological environment and difficulty in recovering after pollution [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Arsenic and Heavy Metals in Sediments Affected by Typical Gold Mining Areas in Southwest China: Accumulation, Sources and Ecological Risks

Chen

Zha

et al. 2023

IJERPH

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Gold mining is associated with serious heavy metal pollution problems. However, the studies on such pollution caused by gold mining in specific geological environments and extraction processes remain insufficient. This study investigated the accumulation, fractions, sources and influencing factors of arsenic and heavy metals in the sediments from a gold mine area in Southwest China and also assessed their pollution and ecological risks. During gold mining, As, Sb, Zn, and Cd in the sediments were affected, and their accumulation and chemical activity were relatively high. Gold mining is the main source of As, Sb, Zn and Cd accumulation in sediments (over 40.6%). Some influential factors cannot be ignored, i.e., water transport, local lithology, proportion of mild acido-soluble fraction (F1) and pH value. In addition, arsenic and most tested heavy metals have different pollution and ecological risks, especially As and Sb. Compared with the other gold mining areas, the arsenic and the heavy metal sediments in the area of this study have higher pollution and ecological risks. The results of this study show that the local government must monitor potential environmental hazards from As and Sb pollution to prevent their adverse effects on human beings. This study also provides suggestions on water protection in the same type of gold-mining areas.

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William B. White and Elizabeth L. White (USA): their contributions to karst hydrogeology discussed in an interview

Cited by 4 publications

References 13 publications

Retention and Transport of Nanoplastics with Different Surface Functionalities in a Sand Filtration System

Retention and Transport of Nanoplastics with Different Surface Functionalities in a Sand Filtration System

Geochemistry of Metals and Organic Matter in Water and Sediments of the Karst River Cetina, Croatia

Arsenic and Heavy Metals in Sediments Affected by Typical Gold Mining Areas in Southwest China: Accumulation, Sources and Ecological Risks

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