ANALISIS AIR TERCEMAR

Summary

This video presentation by Nur Jihan Azhari from the Chemical Analysis 2 class covers the analysis of contaminated water. It explains the importance of water, its unique properties, and its various sources such as surface water, groundwater, and rainwater. The video also addresses water pollution, its causes, and its effects on water quality. The script includes details on the physical, biological, and chemical parameters of water, such as turbidity, oxygen levels, and pollutants. The presentation concludes with a detailed procedure for analyzing the Biological Oxygen Demand (BOD) in water samples, showing how high BOD values indicate water contamination.

Takeaways

• 😀 Water is essential for all life forms on Earth, with a chemical formula of H2O, consisting of two hydrogen atoms and one oxygen atom connected by covalent bonds.
• 😀 Water has unique properties, such as its ability to change state, flow from high to low areas, and be absorbed through small openings.
• 😀 Capillarity is a notable property of water, where it can move upwards against gravity due to surface tension.
• 😀 Water is an excellent solvent, capable of dissolving various substances, which is used in daily activities like making beverages and cleaning.
• 😀 Water takes the shape of the container it occupies, and it exerts pressure equally in all directions, spreading evenly when spilled.
• 😀 Earth’s water is mainly sourced from surface water, groundwater, rainwater, and springs, with approximately 71% of the planet’s surface covered by water.
• 😀 Groundwater is a primary source of drinking water, but it must be extracted through wells or boreholes, and it originates from rainfall that infiltrates the soil.
• 😀 Polluted water is water that has been contaminated, either by human activities or natural processes, making it unsafe for use in its original capacity.
• 😀 Physical parameters of water include its natural color, odor, taste, turbidity, and temperature, which can indicate contamination levels.
• 😀 Biological parameters involve organisms like plankton, benthos, nekton, and neuston, which help assess the health of aquatic ecosystems.
• 😀 Chemical parameters of water, such as BOD (Biochemical Oxygen Demand), are essential for determining the extent of water pollution and the impact on aquatic life.

Q & A

What is the chemical formula of water and what does it represent?

The chemical formula of water is H2O, which means each molecule contains one oxygen atom and two hydrogen atoms, bonded together by covalent bonds.

What is the first property of water mentioned in the script?

The first property of water is its ability to change states. Water can change from liquid to gas (vapor) when heated, or to solid (ice) when cooled.

How does water flow naturally in the environment?

Water flows from higher to lower places, which can be observed in natural features like rivers and waterfalls, due to gravity.

What is capillarity, and how does it relate to water's behavior?

Capillarity is the ability of water to move against gravity, through narrow spaces. This property can be seen when water rises in a cloth or through small tubes.

What are the main sources of water on Earth, as mentioned in the script?

The main sources of water on Earth include surface water (rivers, lakes), groundwater, rainwater, and spring water.

What does water pollution refer to, and what causes it?

Water pollution refers to the contamination of water, making it unsuitable for its intended use. It is typically caused by human activities, such as dumping waste into rivers.

What are the physical parameters used to assess water quality?

Physical parameters include color, odor, taste, turbidity, and temperature. These properties can indicate the presence of pollutants.

What biological parameters are important in assessing water quality?

Biological parameters include the abundance of plankton, benthos, nekton, neuston, and periphyton. These organisms help assess the health and fertility of water bodies.

What chemical parameters are assessed in water pollution analysis?

Chemical parameters include organic and inorganic pollutants such as ammonia, phosphates, and heavy metals. These chemicals affect the oxygen levels in water.

How is BOD (Biochemical Oxygen Demand) analyzed, and what does it indicate?

BOD is analyzed by measuring the oxygen consumed by microorganisms to decompose organic matter. A high BOD indicates low oxygen levels in the water, which can harm aquatic life.