The Estimation of Phosphate and of Total Phosphorus in Sea Waters

1948 ◽  
Vol 27 (2) ◽  
pp. 337-359 ◽  
Author(s):  
H. W. Harvey
Keyword(s):  
Total Phosphorus ◽  
Sea Water ◽  
Organic Phosphorus ◽  
Physical Adsorption ◽  
Suspended Particles ◽  
Phosphorus Compounds ◽  
Molybdenum Blue ◽  
Hydrolysis Of ◽  
Growth Of Bacteria

A simple photoelectric meter is described which allows the molybdenum blue formed in sea water, due to the presence of phosphate, to be estimated within that due to ± 0·25 mg. phosphate-P per m.3.The effects of concentration of acid, molybdate, reductant, temperature and suspended particles on the rate of formation, fading and amount of molybdenum blue, formed in sea waters containing phosphate are detailed.Intramolecular changes taking place during storage of molybdate solutions, and while being mixed with acidified sea water, have been investigated.The hydrolysis of organic phosphorus compounds in acidified sea water at 140° C , and the prevention of arsenate formation, are described.Procedures, resulting from these investigations, for the estimation of phosphate, and of total phosphorus, are described.The growth of bacteria and the physical adsorption of organic phosphorus compounds in solution on the walls of glass vessels used for storage of sea water have been investigated, and a method of prevention evolved.

scholarly journals On changes taking place in sea water during storage

1941 ◽  
Vol 25 (2) ◽  
pp. 225-233 ◽  
Author(s):  
H. W. Harvey
Keyword(s):  
Solid Surface ◽  
Rapid Growth ◽  
Sea Water ◽  
Organic Phosphorus ◽  
Phosphorus Compounds ◽  
Dissolved Organic Phosphorus ◽  
Growth Of Bacteria

The rapid growth of bacteria when sea water is stored in glass vessels, and the possibility that this is brought about by the concentration of food by adsorption on the solid surface, are discussed. Some evidence is presented bearing upon such adsorption.The regeneration of phosphate from dissolved organic phosphorus compounds in the sea and in stored water is considered.

scholarly journals Sorption and hydrolysis of added organic phosphorus compounds in lake sediments1

1977 ◽  
Vol 22 (3) ◽  
pp. 415-422 ◽  
Author(s):  
M. G. Rodel ◽  
D. E. Armstrong ◽  
R. F. Harris
Keyword(s):  
Organic Phosphorus ◽  
Phosphorus Compounds ◽  
Hydrolysis Of

scholarly journals The Utilization of Organic Phosphorus by Phytoplankton

1946 ◽  
Vol 26 (3) ◽  
pp. 285-295 ◽  
Author(s):  
S. P. Chu
Keyword(s):  
Sea Water ◽  
Organic Phosphorus ◽  
Skeletonema Costatum ◽  
Marine Organisms ◽  
Phosphorus Compounds ◽  
Dissolved Organic Phosphorus ◽  
Nitzschia Closterium ◽  
Phaeocystis Pouchetii ◽  
Better Than

Cultural experiments were made with marine organisms in enriched crude sea water and in bacteria-free cultures with the phosphorus supplied in different forms. It was found that pyrophosphate cannot be utilized as a source of phosphorus as effectively as orthophosphate by the organisms cultured, i.e. Phaeocystis Pouchetii, Skeletonema costatum and Nitzschia closterium. Growth of Phaeocystis Pouchetii was a little better and lasted longer when phytin was supplied to natural sea water as a source of phosphorus than when orthophosphate was supplied. Phytin can also support a growth of Skeletonema costatum and Nitzschia closterium as good as, or a little better than, orthophosphate.The organic phosphorus compounds used in these experiments were found to be broken down into orthophosphate in natural sea water. In bacteria-free cultures phytin and glycerophosphoric acid can be effectively used as such by Nitzschia closterium forma minutissima as a source of phosphorus, while sodium nucleinate and lecithin can not be effectively used as such. The organic phosphorus dissolved out from the blades of Laminaria can also be utilized by this diatom as effectively as orthophosphorus.It would seem, therefore, that not only the dissolved orthophosphate as generally assumed, but the dissolved organic phosphorus in the sea may also be absorbed and utilized by plants.

scholarly journals Phosphatase Hydrolysis of Organic Phosphorus Compounds

2015 ◽  
Vol 03 (02) ◽  
pp. 39-51 ◽  
Author(s):  
Irenus A. Tazisong ◽  
Zachary N. Senwo ◽  
Zhongqi He
Keyword(s):  
Organic Phosphorus ◽  
Phosphorus Compounds ◽  
Hydrolysis Of

scholarly journals The Rate of Liberation of Phosphate in Sea Water by the Breakdown of Plankton Organisms

1935 ◽  
Vol 20 (2) ◽  
pp. 197-200 ◽  
Author(s):  
L. H. N. Cooper
Keyword(s):  
Sea Water ◽  
Organic Phosphorus ◽  
Time Lag ◽  
Phosphorus Compounds ◽  
Phosphate Content ◽  
Dissolved Organic Phosphorus ◽  
Short Time

Samples of animal and plant plankton were added to sea water in glass vessels and the subsequent changes in the phosphate content of the water were followed.The breakdown of the zooplankton was very rapid and more phosphate was set free than had originally been added as plankton. The balance was produced from dissolved organic phosphorus compounds in the water. The breakdown of phytoplankton showed a short time lag and only a part of the phosphorus added was set free as phosphate.

738. Phospholipids in New Zealand dairy products: III. Effect of storage on the phospholipids and on the partition of phosphorus in butter

1958 ◽  
Vol 25 (3) ◽  
pp. 475-479 ◽  
Author(s):  
A. K. R. McDowell
Keyword(s):  
New Zealand ◽  
Total Phosphorus ◽  
Dairy Products ◽  
Trichloroacetic Acid ◽  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Phosphorus Compounds ◽  
Inorganic P ◽  
Total Phosphorus Content ◽  
Total P

Average values for the total phosphorus content of sera from unsalted butter samples and for the phosphorus contents of the various fractions of the sera after partition with trichloroacetic acid were: total P, 83·6 mg./100g.; acid-soluble P, 32·4 mg./100 g.; inorganic P, 28·8 mg/100 g.; acid-insoluble P, 51·2 mg./100 g.; and phospholipid p, 33·6 mg./100 g.There was no evidence that decomposition of the phospholipids or other organic phosphorus compounds occurred in salted or unsalted sweet-cream butters during storage at –10° C. for 8 months.

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