|
|
|
Information about chemistry of seawater |
What is exactly natural seawater? |
Rating: +++++ |
Visitors: 38828 |
Comments: 0 |
Posted: 15.07.2009 |
|
As an introduction to this article an obligatory question: What is natural seawater? If
we leave aside the solid particles, gases and colloidal matter present in marine water, and we
concentrate only on the dissolved organic matter, the result may be surprising for a few:
|
full entry... |
Boron - (Borum) - B |
Rating: +++++ |
Visitors: 11761 |
Comments: 0 |
Posted: 20.02.2008 |
|
Boron occurs in nature exclusively in the form of boron compounds. With an average molar
concentration of 4,16.10-4 mol/l, boron is the eighth most common element in marine
water. Expressed in mass units its average concentration is 4,5.10-3 g/l (4,5
mg/l). |
full entry... |
Iodine - (Iodum) - I |
Rating: +++++ |
Visitors: 11602 |
Comments: 0 |
Posted: 12.12.2008 |
|
Iodine occurs on Earth exclusively in the form of iodine compounds, primarily diluted in
salt-water and freshwater. With an average molar concentration of 4.10-7 mol/l, iodine is
the eighteenth most abundant element in sea water. Expressed in mass units, the iodine concentration
ranges between 2,5.10-5 - 6,4.10-5 g/l (0,025 - 0,064
mg/l). |
full entry... |
Potassium - (Kalium) - K |
Rating: +++++ |
Visitors: 11792 |
Comments: 0 |
Posted: 17.01.2008 |
|
Potassium occurs in large amounts in the earth crust, while in seawater and in living
organisms exclusively in the form of potassium compounds. With an average molar concentration of
1,02.10-2 mol/l (expressed in mass units: 399 mg/l) potassium is the eighth most abundant
element in seawater. |
full entry... |
Nitrogen - (Nitrogenium) - N |
Rating: +++++ |
Visitors: 19245 |
Comments: 0 |
Posted: 01.04.2012 |
|
Nitrogen primary form on Earth is molecular nitrogen. With an average molar concentration
of 2,25.10-5 mol/l is nitrogen the fifteenth most common element in sea water. Expressed
in mass units, the nitrogen concentration ranges between 0 and 45.10-6 g/l (0 - 45
μg/l). |
full entry... |
Phosphorus - (Phosphorum) - P |
Rating: +++++ |
Visitors: 18967 |
Comments: 0 |
Posted: 18.09.2009 |
|
Due to its high reactivity, phosphorus occurs in nature only in the form of
phosphorus compounds, to the greater extent
in the minerals of Earth crust. According to its average molar concentration of 1,6.10-6
mol/l, phosphorus is the sixteenth most abundant element in seawater. Expressed in mass units its
average concentration is 4,96.10-5 g/l (50 μg/l). |
full entry... |
Amino Acids |
Rating: +++++ |
Visitors: 11301 |
Comments: 0 |
Posted: 27.02.2009 |
|
Amino acids (AA) are in general any organic compounds containing
carboxylic (-C00H) and amine (-NH2) functional groups. From among
vast number of AAs, most important are L-alpha-amino acids - headstones of all proteins and
thus key in natural sciences. |
full entry... |
Fatty Acids |
Rating: +++++ |
Visitors: 10650 |
Comments: 0 |
Posted: 12.08.2008 |
|
Fatty acids (FAs) are organic monocarboxylic acids. Their molecule always begins with a
methyl group (-CH3) and is terminated with a carboxylic one (-COOH). In-between there are
at least 6 methylene groups (-CH2-) and may contain one or more double bonds (-CH=CH-).
Carboxylic acids with a lower carbon atom number than 8 are not considered as fatty
acids. |
full entry... |
|
|
|
|