What are the types of gases in seawater? What gases are in seawater?

The gases in seawater are mainly composed of oxygen and carbon dioxide.

Mainly. The oxygen in seawater comes mainly from the atmosphere and the photosynthesis of marine plants.

Carbon dioxide in seawater also comes mainly from the respiration of the atmosphere and marine organisms and the decomposition of biological debris. Therefore, the amount of oxygen and carbon dioxide in seawater is closely related to the amount of oxygen and carbon dioxide in the atmosphere and the amount of life in the ocean.

When plants in the ocean grow luxuriantly and photosynthesis is strong, the water contains more dissolved oxygen and less carbon dioxide; When there are many biological debris and plant photosynthesis is weak, the water contains more carbon dioxide and less oxygen. When the temperature of seawater increases, the oxygen content of seawater decreases; When the water temperature drops, the oxygen content in the seawater increases.

Solubility of carbon dioxide in seawater.

Very limited, but plants in the ocean are able to consume large amounts of carbon dioxide, and in a slightly alkaline environment, carbon dioxide in seawater combines with calcium ions to produce calcium carbonate.

Precipitation. As a result, carbon dioxide in the atmosphere is constantly dissolved in the seawater, so the air on the ocean or on the coast is always fresh. In this sense, the ocean is a huge regulator of the Earth's climate.

Gases present in the Earth's atmosphere can also be found in oceans and seas, but in different proportions. Comparatively, the Earth's atmosphere contains about 76% nitrogen, 21% oxygen, and 1% argon, and all other gases (e.g. carbon dioxide) about 76% by weight. In the ocean, the most common gases are oxygen (in to/million parts and varies with the depth of the ocean, with the highest concentration at the sea surface), nitrogen (in parts per million), and argon (in parts per million), with only trace amounts of carbon dioxide.

Among the gases of seawater, the inert gas is the most stable, and the change in its content distribution in seawater is usually small; The distribution and variation of oxygen and carbon dioxide content are related to chemical, physical, biological and geological processes in the ocean; Trace gases such as hydrogen, methane and carbon monoxide are mainly produced in the biochemical processes of the ocean, so their content varies greatly in time and space. Synthetic gases are not inherent in the oceans, and their distribution in the oceans is complex; Some radioactive gases, such as carbon dioxide-14, radon-222 and krypton-85, have their own decay laws and are more complex in their distribution in the ocean. Therefore, according to the difference of gases in seawater, the difference in composition and the characteristics of distribution, the physical, chemical, biological and geological processes that occur in the ocean can be studied.

All the gaseous components of the atmosphere, such as nitrogen, oxygen, inert gases, carbon dioxide, and gaseous components released into the atmosphere during human production processes, have some solubility in seawater. Gases dissolved in seawater are continuously exchanged through the interface between the ocean and the atmosphere (see Gases Exchange Between the Ocean and the Atmosphere). The overall effect is:

On the one hand, the ocean absorbs the increasing levels of gaseous components in the air, such as carbon dioxide and organic fluorine. On the other hand, the ocean releases gases such as carbon monoxide, methane, hydrogen, nitrous oxide, and methane iodide into the atmosphere. Nitrous oxide, carbon monoxide, hydrogen and some organic fluorines in the atmosphere can destroy the ozone layer through chemical reactions or photochemical reactions, affecting the earth's environment and climate. Therefore, what kind of gas is the source and sink of the ocean, and the exchange rate and flux of gas at the interface between the ocean and the atmosphere are all important research topics.

Peroxide or superoxide, which meets water to form O2

Strong. There is about 2 mmol l of dissolved inorganic carbon in seawater, mainly in the form of HCO3-. The addition of acid forms CO2 gas.

Strong oxidants, such as acidic KMno4, turn chloride ions in seawater into chlorine gas.

A pair of electrodes with sufficient DC voltage – forming an electrolyzer, which is equivalent to electrolyzing a NaCl solution, forming H2 and Cl2 and part of O2

Reactive metals, such as K and Na, react with water to form H2

Marine phytoplankton can photosynthesize dissolved CO2 in seawater to produce O2 when exposed to light

Some microorganisms in the ocean can produce some gases under certain conditions, such as N2O, CH4, H2S, etc.

The most important thing is water! Needless to say, seawater is a solution, and a solution is made up of solutes and solvents (water).

The solute composition is as follows:

There are 11 kinds of chemicals with the most abundant content in seawater: sodium, magnesium, calcium, potassium, strontium and other five cations; Chlorine, sulfate, bicarbonate (including carbonate), bromine and fluorine are five anionic and boric acid molecules. The top three are sodium, chloride and magnesium.

Here's what I copied from the encyclopedia.

The components in seawater can be divided into five categories:

1.Main components (macro, macroelements): refers to the components in seawater with a concentration greater than 1 106mg kg.

There are five kinds of cations Na+, K+, Ca2+, Mg2+ and SR2+ in this category, Cl, SO42, Br, HCO3 (CO32), F in anions, and H3Bo3 in molecular form, the sum of which accounts for the salt content of seawater. So it's called the main ingredient. Because the content of these components in seawater is large, the concentration ratio of each component is approximately constant, and biological activities and total salinity changes have little effect on it, so it is called a conserved element.

The Si content in seawater is sometimes greater than 1 mg kg, but because its concentration is greatly affected by biological activities and its properties are unstable, it is a non-conservative element, so the main components are not included in the discussion.

2.Gases dissolved in seawater, such as oxygen, nitrogen and inert gases.

3.Nutrients (nutrients, biogens): mainly related to the growth of marine plants, usually referring to N, P and Si.

The amount of these elements in seawater is often affected by plant activity, and when their levels are very low, they can limit the normal growth of plants, so these elements are important for living things.

4.Trace elements: those that are very low in seawater, but do not belong to nutrients.

5.Organic substances in seawater: such as amino acids, humus, chlorophyll, etc.

At most, it must be water, followed by salt nacl