Dissolved carbon and silica fluxes from Kali, Sharavati and Sita-Swarna rivers, Southwestern India

1975 ◽

Vol 10 (1) ◽

pp. 33-41 ◽

Cited By ~ 3

Author(s):

J. Butcher ◽

M. Boyer ◽

CD. Fowle

Keyword(s):

Carbon Dioxide ◽

Active Ingredient ◽

Algal Blooms ◽

Chemical Properties ◽

Total Carbon ◽

Dissolved Carbon ◽

Photosynthetic Productivity ◽

Dissolved Carbon Dioxide ◽

Microbial Numbers

Abstract Eleven small ponds, lined with polyethylene, were used to assess the consequences of applications of *DursbanR at 0.004, 0.030, 0.100 and 1.000 ppm and AbateR at 0.025 and 0.100 ppm active ingredient. The treated ponds showed a more pronounced long-term increase in pH and dissolved oxygen and decreasing total and dissolved carbon dioxide in comparison with untreated ponds. Algal blooms were of longer duration in treated ponds than in controls. Total photosynthetic productivity was higher in treated ponds but bacterial numbers did not change significantly. Photosynthetic productivity was estimated by following the changes in total carbon dioxide.

Download Full-text

Advances in sample digestion using microwave-ultraviolet radiations: phosphorus and sulfur determination in animal feed

Current Analytical Chemistry ◽

10.2174/1573411016999200930115139 ◽

2020 ◽

Vol 16 ◽

Author(s):

Diogo L. R. Novo ◽

Priscila T. Scaglioni ◽

Rodrigo M. Pereira ◽

Filipe S. Rondan ◽

Gilberto S. Coelho Junior ◽

...

Keyword(s):

Inductively Coupled Plasma ◽

Animal Feed ◽

Optical Emission ◽

Emission Spectrometry ◽

Official Method ◽

Dissolved Carbon ◽

Inductively Coupled ◽

Relative Standard ◽

Wide Range ◽

Sulfur Determination

Background: Conventional analytical methods for phosphorus and sulfur determination in several matrices present normally analytical challenges regarding inaccuracy, detectability and waste generation. Objective: The main objective is proposing a green and feasible analytical method for phosphorus and sulfur determination in animal feed. Methods: Synergic effect between microwave and ultraviolet radiations during sample preparation was evaluated for the first time for the animal feed digestion associated with further phosphorus and sulfur determination by ion chromatography with conductivity detection. Dissolved carbon and residual acidity in final digests were used for the proposed method assessment. Phosphorus and sulfur values were compared with those obtained using conventional microwave-assisted wet digestion in closed vessels associated with inductively coupled plasma optical emission spectrometry and with those obtained using Association of Official Analytical Chemists International official method. Recovery tests and certified reference material analysis were performed. Animal feeds were analyzed using the proposed method. Results: Sample masses of 500 mg were efficiently digested using only 2 mol L -1 HNO3. The results obtained by the proposed method was not differing significantly (p > 0.05) from those obtained by the conventional and official methods. Suitable recoveries (from 94 to 99%), agreement with certified values (101 and 104%) and relative standard deviations (< 8%) were achieved. Phosphorus and sulfur content in commercial products varied in a wide range (P: 5,873 to 28,387 mg kg-1 and S: 2,165 to 4,501 mg kg-1 ). Conclusion: The proposed method is a green, safe, accurate, precise and sensitive alternative for animal feed quality control.

Download Full-text

Strategies and adaptations to aquatic life at high altitude

10.1093/oso/9780198736868.003.0005 ◽

2017 ◽

Author(s):

Dean Jacobsen ◽

Olivier Dangles

Keyword(s):

High Altitude ◽

Environmental Conditions ◽

Low Temperatures ◽

Cold Adaptation ◽

Inorganic Carbon ◽

Direct Result ◽

Aquatic Life ◽

Dissolved Carbon ◽

Dissolved Carbon Dioxide ◽

Regulatory Capacity

Chapter 5 is focused on how organisms cope with the environmental conditions that are a direct result of high altitude. Organisms reveal a number of fascinating ways of dealing with a life at high altitude; for example, avoidance and pigmentation as protection against damaging high levels of ultraviolet radiation, accumulation of antifreeze proteins, and metabolic cold adaptation among species encountering low temperatures with the risk of freezing, oxy-regulatory capacity in animals due to low availability of oxygen, and root uptake from the sediment of inorganic carbon by plants living in waters poor in dissolved carbon dioxide. These and more adaptations are carefully described through a number of examples from famous flagship species in addition to the less well-known ones. Harsh environmental conditions work as an environmental filter that only allows the well-adapted species to slip through to colonize high altitude waters.

Download Full-text