Why is there hydrogen sulfide in the Black Sea?

The Black Sea is the world largest water body containing hydrogen sulfide. This is because it has an inflow of salty Mediterranean Sea water in the deep layers and an inflow of river water on the top, so the sea is stratified and cannot even be mixed by wind.

How does hydrogen sulfide get into the seawater?

In the presence of excess dissolved oxygen in seawater, dissolved hydrogen sulfide (H2S) is oxidized rapidly in the seawater. On average, H2S breakdown at 9.9 ± 0.8 minute in the seawater when dissolved oxygen is in excess.

Why is the Black Sea so salty?

According to a number of marine geologists, the Black Sea was a freshwater lake around 7,000 years ago before a rise of water in the Mediterranean Sea caused the entry of salt water into the lake.

How do you get hydrogen sulfide?

In addition, hydrogen sulfide is produced by bacterial break- down of organic materials and human and animal wastes (e.g., sewage). Industrial activities that can produce the gas include petroleum/natural gas drilling and refining, wastewater treatment, coke ovens, tanneries, and kraft paper mills.

Why is there no oxygen at the bottom of the Black Sea?

The permanent stratification linked to salinity, the halocline, deprives the deep waters of oxygen. The marine food chain therefore develops above this boundary below which the waters are devoid of oxygen.

Why is the Black Sea called Black Sea?

The Black Sea has a depth of over 150 meters, and its waters are filled with hydrogen sulfide for almost two kilometers. From the perspective of sailors, the sea was black due to severe storms in the winter, during which the water is so dark it looks black.

What is hydrogen sulfide in the ocean?

The anaerobic bacteria that complete the decay process release toxic hydrogen sulfide into the ocean. The gas builds near the ocean floor until a bubble erupts to the surface. As it rises, the hydrogen combines with oxygen to form water molecules, leaving solid, yellow sulfur.

Is hydrogen sulfide in ocean water?

Hydrogen sulfide frequently occurs in oxygen-deficient areas of the ocean such as coastal lagoons, stagnant basins, and organ- ic-rich sediments where circulation is re- stricted. Rare occurrences in the open sea beneath areas with intense productivity have also been reported (Dugdale et al. 1977).

Why are Red Sea Dead sea and Black Sea named so?

(i) Red Sea – It is named Red sea because it contains a Cyanobacteria which turns the normally blue – green water a reddish one. It gets connected to the ocean without even one river meeting the sea. (ii) Black Sea – The Black Sea was first named by the ancient greeks as in hospitable sea.

What causes Sulphur smell in water?

Most frequently, however, the smell of sulfur in your water is likely due to the existence of sulfate-reducing bacteria, which produces hydrogen sulfide as a byproduct. What Causes a Sulfur Smell in Water? Even small amounts of hydrogen sulfide can lead to the smell or taste of sulfur in drinking water.

What causes sulfur smell in hot water?

You are most likely on well water, and there is a bacteria, known as SRB (sulfate-reducing bacteria), that gets into water heaters and, although harmless to humans from a pure health perspective, creates the odor by digesting naturally occurring sulfur-based elements in the water, releasing tiny amounts of hydrogen …

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