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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

260
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...
260
Quality of Water01:19

Quality of Water

381
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...
381

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Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
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Assessing environmental pollution levels in marinas.

José M Guerra-García1, Carlos Navarro-Barranco1, Gemma Martínez-Laiz1

  • 1Laboratorio de Biología Marina, Departamento de Zoología, Facultad de Biología, Universidad de Sevilla, Avenida Reina Mercedes 6, 41012 Seville, Spain.

The Science of the Total Environment
|December 28, 2020
PubMed
Summary

Marinas show significant pollution differences, with turbidity, biocides, hydrocarbons, and coliforms as key indicators. A new index, Marinas Environmental Pollution Index (MEPI), reveals moderate to bad pollution levels in Southern Iberian Peninsula marinas.

Keywords:
IrgarolMEPI indexQuality assessmentRecreational boatingSediment

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Area of Science:

  • Marine environmental science
  • Environmental chemistry
  • Ecotoxicology

Background:

  • Recreational boating and marina development are increasing globally.
  • Environmental data for these ecosystems, crucial for risk assessment and management, remain scarce.
  • Pollutant data are essential for international environmental management strategies.

Purpose of the Study:

  • To compare pollution levels across marinas in the Southern Iberian Peninsula (SIP).
  • To identify key environmental variables differentiating marina pollution.
  • To develop and test a new method for assessing marina environmental quality.

Main Methods:

  • Analysis of 64 variables (30 in seawater, 34 in sediments) across SIP marinas.
  • Uni and multivariate statistical analyses to identify significant differences.
  • Development and application of the Marinas Environmental Pollution Index (MEPI) using sediment stressors and established guidelines.

Main Results:

  • Significant differences in environmental variables were found among SIP marinas, highlighting the need for local management.
  • Turbidity and Irgarol 1051 in seawater, and granulometry, hydrocarbons, and faecal coliforms in sediment were key differentiating factors.
  • MEPI scores for SIP marinas ranged from 60 to 110, indicating bad to moderate pollution levels.

Conclusions:

  • Marina pollution varies significantly, necessitating localized management strategies.
  • The developed MEPI provides a straightforward tool for assessing marina environmental quality.
  • Accurate pollution data and assessment tools are vital for eco-certifications like Blue Flags and evaluating management effectiveness.