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The Seafarer’s Essential Glossary
Gas Safety
Master essential gas safety terminology for life-saving onboard practices.
- Learn the core terms for establishing basic gas safety.
- Explore categorized terms for easier reference.
- Prioritize safety by pairing knowledge with expert assessments.
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The Seafarer’s Essential Glossary
Understanding Water Testing at Sea
Master maritime water testing with key insights and practical knowledge
• Clarify complex terms, equipment, and methodologies.
• Ensure compliance with water safety regulations.
• Protect crew wellbeing and preserve marine environments.
Dear seafarer,
Maritime water testing is a multifaceted field. This glossary aims to simplify its complex terminology. It encompasses a diverse collection of terms, equipment, and methodologies, each playing a pivotal role in ensuring the crew’s wellbeing and preserving our marine environments.
Whether you are ensuring water safety, adhering to regulations, or optimizing vessel performance, we aim to empower you with knowledge for informed decisions.
We hope you find this glossary a handy tool in your work.
Safe sailing from all of us at Martin Bruusgaard AS!
Algal Blooms
Rapid and excessive algae growth, often due to nutrient enrichment, impacting water quality, marine ecosystems, oxygen levels, and aquatic organism health.
Alkalinity
Water’s capacity to resist pH changes, primarily due to bicarbonate ions. A key parameter in water chemistry affecting aquatic life, buffering capacity, and acid rain effects.
Ballast Water
Water taken on by a ship to maintain stability, often subject to testing for pollutants and organisms due to its ecological risks associated with unintended species transport.
Biochemical Oxygen Demand (BOD)
The amount of oxygen microorganisms require to decompose organic matter in water, a measure of water pollution and degradation. Reflects the organic pollution load and the water’s selfpurification capacity, providing insights into its health.
Bilge Water
Accumulated water in a ship’s lowest compartments, often containing pollutants. Necessitates regular assessment and proper management to prevent marine contamination.
Boiler Water
The water contained within a ship’s boiler system, which is heated to produce steam for various maritime applications, such as propulsion, power generation, and heating. Proper treatment and maintenance of boiler water is essential to prevent corrosion scale buildup and ensure efficient and safe operation of the ship’s boilers.
Brackish Water
A mix of freshwater and seawater found in coastal areas, with intermediate salinity. Vital for diverse ecosystems adapting to changing salt levels, and linking land and sea environments.
Calibration Standards
Known reference solutions used to calibrate measurement instruments, ensuring accurate and reliable results during water testing and quality assessment.
Chemical Oxygen Demand (COD)
The amount of oxygen needed to oxidize organic and inorganic substances in water. Chemically indicates the overall pollution level and organic matter load.
Chlorine
A disinfectant commonly used in water treatment to control microbial growth and ensure potable water safety. Essential for maintaining safe drinking water by eliminating harmful bacteria, viruses, and pathogens, and preventing waterborne diseases. Excessive levels can adversely affect aquatic ecosystems when present in ballast tanks.
Coliforms/E. coli
Indicator bacteria present in water samples, signifying potential fecal contamination. Their detection aids in assessing water safety and identifying risks to human health, necessitating proper disinfection and treatment measures, especially in potable water systems.
Comparator Unit
A device comparing the color of a water sample with standard color scales, allowing rapid visual assessment of water quality parameters, facilitating quick onsite analysis, and aiding in decision making for water treatment and management.
Conductivity
The ability of water to conduct electrical current, influenced by ion concentration and water composition. A parameter used to assess water purity, pollution, and salinity levels.
Contaminant Detection
Identification and quantification of pollutants, pathogens, and harmful substances in water samples, enabling effective management of water quality and minimizing health-related and environmental risks.
Cooling Water
Water circulated through ship cooling systems, dissipating excess heat generated by machinery. Monitoring and maintaining appropriate temperature levels are crucial to prevent overheating, maintain equipment efficiency, and ensure the safe operation of maritime systems.
Data Interpretation
The process of analyzing water testing results, identifying trends, patterns and anomalies, and translating data into actionable insights for informed decision making and policy formulation.
Data Logger
A device recording water measurements over time, crucial for trend analysis, long-term monitoring, and ensuring data accuracy in water quality assessments.
Digestor Unit
A laboratory equipment applying controlled heat to water samples, facilitating the breakdown of complex substances into simpler components, enabling thorough analysis of organic and inorganic content in water for precise water quality assessment.
Dissolved Oxygen (DO)
Oxygen gas dissolved in water is vital for aquatic organisms’ respiration and metabolic processes, reflecting water quality and its capacity to support marine life. Low DO levels can lead to oxygen depletion and harm marine ecosystems.
Enterococci
Bacteria commonly found in the intestines of humans and animals. Their presence in water samples indicates fecal contamination and the potential presence of harmful pathogens, requiring thorough water testing and treatment to ensure safety.
Freshwater
Untreated water suitable for drinking, cooking, hygiene, and ship operations, requiring consistent quality monitoring.
Grey Water
Wastewater from non-toilet sources like sinks, showers, and laundry. Distinct from black water (sewage) and requires treatment before safe discharge to prevent environmental contamination.
Hardness
The concentration of calcium and magnesium ions in water. Impacts suitability for various uses, potential for scale formation, and interactions with cleaning agents and appliances.
Heavy Metals (Lead, Mercury, Cadmium)
Toxic elements entering water bodies through industrial processes, runoff, and other sources. Poses severe threats to water quality, aquatic life, and human health.
Heterotrophs
Microorganisms relying on organic carbon for growth. Their abundance and diversity in water samples reflect organic pollution levels and overall water quality, assisting in assessing ecosystem health and pollution impacts.
Invasive Species
Non-native organisms unintentionally introduced to new ecosystems via ballast water discharge, capable of disrupting local biodiversity, ecosystems, and species interactions.
Legionella
A bacterium responsible for Legionnaires’ disease, a severe respiratory illness contracted through inhalation of contaminated water droplets. Monitoring and prevention is crucial onboard to safeguard crew and passenger health.
Marine Biofouling
Accumulation of marine organisms on ship hulls and structures, affecting vessel performance, fuel efficiency, and water quality, necessitating mitigation strategies and management.
Marine Ecosystem Health
The overall well-being and functioning of marine environments, influenced by water quality, pollution levels, habitat preservation, and the balance of various species and interactions.
Microplastics
Tiny plastic particles originating from the degradation of larger plastics, pervasive in water bodies. Can potentially impact aquatic habitats, marine life and enter the food chain. Requires careful assessment and mitigation.
Milligrams Per Liter (mg/L)
A standard unit for quantifying the concentration of a substance in water by weight, frequently employed in water quality analysis to determine the presence of various compounds and contaminants.
Nutrient Enrichment (Eutrophication)
The excessive influx of nutrients, often from agricultural runoff or sewage discharge. Leads to algal overgrowth, oxygen depletion, and ecological imbalances in water bodies.
Nutrient Levels (Nitrogen, Phosphorus)
The concentration of essential nutrients influencing water quality, aquatic plant growth, and eutrophication potential. Pivotal for managing ecological balance and preventing algal blooms.
Oil and Hydrocarbons
Pollutants from oil spills, industrial runoff, and maritime activities. Hazardous to marine ecosystems, aquatic organisms, and water quality, demanding swift remediation efforts.
Oil Spills
Accidental release of oil into water bodies, causing immediate and long-term environmental damage, impacting aquatic life, shoreline habitats, and water quality, necessitating urgent response and cleanup measures.
Organic Compounds
Carbon-based substances from industrial processes, agricultural runoff, and human activities. Potential pollutants impacting water quality, aquatic organisms, and overall ecosystem health.
Parts Per Billion (ppb)
A more refined unit for minute concentrations, essential for accurately measuring extremely dilute substances and potential pollutants in water samples.
Parts Per Million (ppm)
A measurement unit indicating the proportion of a substance in water, valuable for quantifying trace concentrations and assessing water quality parameters.
Parts Per Thousand (ppt)
A unit often used to express water salinity, particularly relevant for maritime operations and assessing the health and balance of marine ecosystems. Note that ppt can also mean Parts Per Trillion.
Pathogens (Bacteria, Viruses)
Microorganisms causing diseases in humans and animals, often originating from fecal contamination, necessitating vigilant testing and monitoring to ensure safe water supplies.
pH (Potential of Hydrogen)
The measure of water’s acidity or alkalinity, influencing chemical reactions, solubility, and species’ physiological processes; crucial for understanding ecosystem dynamics and pollution effects. Measurable on a scale of 0 to 14.
Photometer
Device measuring light intensity or color, significant for colorimetric water analysis, turbidity assessments, and quick on-site testing of specific water parameters.
Pesticides and Herbicides
Chemicals entering water bodies through agricultural runoff and pollution. Has potential to harm aquatic life, disrupt ecosystems, and impact water quality, necessitating monitoring and control.
Potable Water (Drinking Water)
Clean, safe water suitable for human consumption on board. A fundamental necessity for crew health, necessitating rigorous testing, treatment, and quality control.
Quality Control
Stringent procedures and protocols implemented to maintain precision, accuracy, and reliability during water testing, ensuring consistent and trustworthy results for risk assessment and regulatory compliance.
Reagents
Chemical substances used in water testing to induce specific reactions crucial for accurately detecting, quantifying, and identifying target substances in water samples.
Refractometer
A device employing light refraction to determine water salinity, valuable for maritime operations, ecological studies, and desalination processes, aiding in assessing water composition and its suitability for specific uses. A quick and accurate method to determine salt concentrations.
Risk Assessment
Evaluation of potential environmental and health hazards based on comprehensive water testing, assisting in prioritizing preventive measures, resource allocation, and response strategies to protect both onboard safety and marine ecosystems.
Salinity
The concentration of dissolved salts, primarily sodium chloride, affecting water density. A critical parameter for maritime water testing as it affects the density, buoyancy, and physical properties of water. Salinity levels can impact marine life, ship stability, and vessel desalination processes.
Salinometer
A device measuring water salinity using electrical conductivity or refractive index, crucial for maritime operations, water quality assessment, and desalination efficiency.
Sampling Kit
Collection of tools facilitating proper water sample collection, preserving sample integrity, and enabling accurate representation of water conditions for subsequent analysis.
Seawater
Saltwater from the ocean encompassing essential minerals and elements. Pivotal for maritime activities and ecological balances.
Sewage Water
Wastewater originating from onboard facilities such as toilets and sinks, demanding thorough treatment to prevent marine pollution and ensure compliance.
Spectrophotometer
Instrument analyzing light absorption and transmission through a sample, used extensively for water quality tests, chemical analysis, and quantification of substances.
Thermometer
A measuring instrument gauging water temperature, a critical parameter influencing aquatic life, chemical reactions, and water quality assessments, aiding various onboard processes and system performance.
Thio Bags
Specialized containers preserving water samples by inhibiting microbial growth and maintaining sample integrity during transportation and storage, essential for accurate onsite water testing and analysis.
Titration Kit
A set of tools used to perform titration, a process to determine the concentration of an unknown substance by reacting it with a solution of known concentration.
Total Dissolved Solids (TDS)
The sum of dissolved minerals, salts, and other substances in water, impacting taste, suitability, and desalination processes; relevant for marine and human consumption. High TDS levels can affect water taste, corrosion potential, and suitability for various shipboard uses.
Total Suspended Solids (TSS)
Refers to the concentration of solid particles suspended in water. Monitoring TSS levels is essential for understanding sediment transport, water clarity, and potential sources of pollution.
Trend Analysis
Examination of historical water quality data to discern patterns, changes, and shifts over time, aiding in the identification of long-term trends and the development of effective management strategies.
Turbidity
Cloudiness caused by suspended particles, impacting water clarity, light penetration, and biological processes; a vital indicator of sediment transport, pollution, and ecosystem health. Relevant for assessing water clarity and the effectiveness of filtration systems.
Turbidity Tube
A transparent cylindrical tool allowing visual assessment of water cloudiness caused by suspended particles. A key indicator of water quality, sediment load, and light penetration, affecting aquatic ecosystems and water clarity.
UV-Meter
An instrument measuring ultraviolet (UV) light intensity, crucial for evaluating the effectiveness of UV disinfection methods and ensuring microbial control in water systems to maintain onboard safety and potable water quality.
Vibrio cholerae
Bacteria causing cholera, a severe waterborne disease leading to dehydration and potential death. Onboard monitoring and prevention strategies are essential to prevent outbreaks and protect crew health.
Waterborne Pollution
Contaminants that enter water bodies through runoff, industrial discharge, and various human activities, endangering aquatic life, ecosystem health, and water quality, demanding control and prevention efforts.
Water Quality Monitoring
Ongoing assessment and evaluation of various water properties to ensure environmental compliance, ecosystem health, and the safety of onboard water supplies for crew and passengers.
Water Testing Kits
Comprehensive sets containing various tools, equipment, and reagents necessary for onsite water analysis, enabling efficient and thorough water quality assessment.
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