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Related Concept Videos

Quality of Water01:19

Quality of Water

568
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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Testing Water Quality01:14

Testing Water Quality

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When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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States of Water01:23

States of Water

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
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Quality Control01:05

Quality Control

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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
Quality control helps track data, visualize trends, and identify variations, making it easier to detect deviations that may affect the accuracy of an analysis. One way to do this is by generating a quality control chart, which...
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Quality Assurance01:19

Quality Assurance

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Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...
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Microbial Morphologies01:29

Microbial Morphologies

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Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
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Continuous Hydrologic and Water Quality Monitoring of Vernal Ponds
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Microbial Water Quality: Monitoring and Modeling.

Y A Pachepsky, A Allende, L Boithias

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    Understanding microbial water quality is crucial for human, animal, and environmental health. This research explores advances and challenges in monitoring, predicting, and managing microbial contamination in water sources.

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    Area of Science:

    • Environmental Microbiology
    • Water Quality Science
    • Public Health

    Background:

    • Microbial water quality is a critical factor linking human, animal, and environmental health.
    • Multidisciplinary research is essential for effective monitoring, prediction, and management of microbial contamination.
    • Understanding the release, transport, and survival of microorganisms is key to safeguarding water resources.

    Purpose of the Study:

    • To provide a panoramic view of current advances and challenges in microbial water quality research.
    • To consolidate international expertise on various facets of microbial water quality.
    • To identify promising research directions for enhancing water resource protection.

    Main Methods:

    • Analysis of spatiotemporal variability in microbial water quality.
    • Investigation of predictors for microbial variations.
    • Evaluation of the role of sediments, biofilms, and molecular markers.
    • Assessment of subsurface microbial transport and antibiotic resistance.
    • Exploration of real-time monitoring, nowcasting, and watershed modeling.

    Main Results:

    • Significant challenges exist in observing and understanding microbial water quality dynamics.
    • Variability in microbial water quality is influenced by multiple environmental factors.
    • Correlation studies highlight the relationship between indicator organisms, pathogens, and risk assessment.
    • Molecular markers and advanced modeling offer new insights into microbial behavior.

    Conclusions:

    • Despite challenges, significant progress has been made in microbial water quality research.
    • Future research should focus on integrating diverse methodologies for a comprehensive understanding.
    • Enhanced knowledge is vital for developing effective strategies to protect and improve water quality.