Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine
Abstract It is widely accepted that the zeta potential in natural sandstones is negative in the brine pH and compositions found in the subsurface. The zeta potential is a measure of the electrical potential at a mineral surface. We report new measurements of the zeta potential using a saline natural...
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| Format: | Article |
| Language: | English |
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Wiley
2021-10-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2021GL094306 |
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| author | Mutlaq Alarouj Harry Collini Matthew D. Jackson |
| author_facet | Mutlaq Alarouj Harry Collini Matthew D. Jackson |
| author_sort | Mutlaq Alarouj |
| collection | DOAJ |
| description | Abstract It is widely accepted that the zeta potential in natural sandstones is negative in the brine pH and compositions found in the subsurface. The zeta potential is a measure of the electrical potential at a mineral surface. We report new measurements of the zeta potential using a saline natural brine rich in divalent ions. The sandstone samples were quartz dominated but some also contained dolomite, siderite, and clay minerals. The quartz‐dominated sandstones showed behavior consistent with earlier studies, but the dolomite‐ and siderite‐bearing samples returned positive zeta potentials. We suggest that this is caused by a positive zeta potential on dolomite and siderite mineral surfaces, adsorption of divalent ions onto quartz mineral surfaces, and/or ion exchange with clay minerals. The results have broad implications for the zeta potential of natural sandstones, because the magnitude and polarity of the zeta potential impact geophysical monitoring and the transport of the charged contaminants. |
| format | Article |
| id | doaj-art-166791c035cc4813b5055f90b5c9d2ad |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-166791c035cc4813b5055f90b5c9d2ad2025-08-20T03:22:14ZengWileyGeophysical Research Letters0094-82761944-80072021-10-014820n/an/a10.1029/2021GL094306Positive Zeta Potential in Sandstones Saturated With Natural Saline BrineMutlaq Alarouj0Harry Collini1Matthew D. Jackson2Earth Science and Engineering Department Imperial College London London UKEarth Science and Engineering Department Imperial College London London UKEarth Science and Engineering Department Imperial College London London UKAbstract It is widely accepted that the zeta potential in natural sandstones is negative in the brine pH and compositions found in the subsurface. The zeta potential is a measure of the electrical potential at a mineral surface. We report new measurements of the zeta potential using a saline natural brine rich in divalent ions. The sandstone samples were quartz dominated but some also contained dolomite, siderite, and clay minerals. The quartz‐dominated sandstones showed behavior consistent with earlier studies, but the dolomite‐ and siderite‐bearing samples returned positive zeta potentials. We suggest that this is caused by a positive zeta potential on dolomite and siderite mineral surfaces, adsorption of divalent ions onto quartz mineral surfaces, and/or ion exchange with clay minerals. The results have broad implications for the zeta potential of natural sandstones, because the magnitude and polarity of the zeta potential impact geophysical monitoring and the transport of the charged contaminants.https://doi.org/10.1029/2021GL094306zeta potentialnatural sandstonenatural brinesurface charge |
| spellingShingle | Mutlaq Alarouj Harry Collini Matthew D. Jackson Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine Geophysical Research Letters zeta potential natural sandstone natural brine surface charge |
| title | Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine |
| title_full | Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine |
| title_fullStr | Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine |
| title_full_unstemmed | Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine |
| title_short | Positive Zeta Potential in Sandstones Saturated With Natural Saline Brine |
| title_sort | positive zeta potential in sandstones saturated with natural saline brine |
| topic | zeta potential natural sandstone natural brine surface charge |
| url | https://doi.org/10.1029/2021GL094306 |
| work_keys_str_mv | AT mutlaqalarouj positivezetapotentialinsandstonessaturatedwithnaturalsalinebrine AT harrycollini positivezetapotentialinsandstonessaturatedwithnaturalsalinebrine AT matthewdjackson positivezetapotentialinsandstonessaturatedwithnaturalsalinebrine |