scholarly journals The Effects of Wind and Tidal Current on the Oceanographical Environment of L. Nakanoumi and L. Shinji/The Change in Aquatic Environment and the Dynamical Structure in Lake Hamana/Behaviors of Inorganic Materials in the Estuary./Distribution of Organic Matter in Estuarine Regions of Tokyo Bay/Some Environmental Characteristics in the Brackish Lake Nakanoumi/Dynamics of Phytoplankton Population

1987 ◽  
Vol 48 (2) ◽  
pp. 148-159
Author(s):  
Yu ISHITOBI ◽  
Yosihiro MAZDA ◽  
Kazuo FUKUSHIMA ◽  
Ryoshi ISHIWATARI ◽  
Yoshio DATE ◽  
...  
Keyword(s):  
Organic Matter ◽  
Aquatic Environment ◽  
Tidal Current ◽  
Inorganic Materials ◽  
Tokyo Bay ◽  
Dynamical Structure ◽  
Brackish Lake ◽  
Environmental Characteristics ◽  
Phytoplankton Population ◽  
Lake Hamana

The Issue of Plastic and Microplastic Pollution in Soil

2019 ◽  
Vol 56 (3) ◽  
pp. 484-487 ◽  
Author(s):  
Valentina Constanta Tudor ◽  
Dorina Nicoleta Mocuta ◽  
Ruxandra Florina Teodorescu ◽  
Dragos Ion Smedescu
Keyword(s):  
Water Pollution ◽  
Organic Matter ◽  
Soil Pollution ◽  
Aquatic Environment ◽  
Negative Impact ◽  
Plastic Material ◽  
Soil Biota ◽  
Toxic Substances

Soil pollution with plastics represents a great threat to plants, animals, but especially to humans, as a very small quantity of the plastic which is discarded daily is recycled or incinerated in waste facilities, much of it reaching landfills where their decomposition lasts up to 1000 years and during this time the toxic substances penetrate the soil and the water. If, initially, the pollution with plastics has been identified and recognized in the aquatic environment, recent studies show that plastics residues exist in huge quantities in the soil. The present study focuses on the analysis of factors that pollute soil, so the various studies that have been carried out claim that soil pollution with plastic is much higher and increases in an aggressive manner, being estimated to be 4 to 23 times higher than water pollution with plastics, and the accumulation of microplastics in the soil has a negative impact on soil biota. Thus, once the plastic material accumulates in the soil, it is assimilated to organic matter and the mineral substitutes of the soil and persists for several hundred years.

Fish farming in Denmark: environmental impact of regulative legislation

1995 ◽  
Vol 31 (10) ◽  
pp. 73-84 ◽  
Author(s):  
T. M. Iversen
Keyword(s):  
Organic Matter ◽  
Environmental Impact ◽  
Freshwater Fish ◽  
Aquatic Environment ◽  
Action Plan ◽  
Fish Farming ◽  
Fish Farms ◽  
Nitrogen And Phosphorus ◽  
Local Impact ◽  
The Impact

The main environmental problems associated with fish farming in Denmark are attributable to the dam, the “dead reach” and nutrient and organic matter discharge. The environmental regulation of fish farming in Denmark started with the Environmental Protection Act of 1974, the Statutory Order of 1985 forbidding wet feed, and the Action Plan on the Aquatic Environment of 1987. In the case of freshwater fish farms, the latter was implemented through the measures stipulated in the 1989 Statutory Order on Fish Farms. The impact of Danish legislative measures to reduce and regulate the environmental effects of freshwater fish farms can be summarized as follows: - the number of fish farms has been reduced from about 800 in 1974 to about 500 at present; - production has tripled since 1974 and has been stable since 1989; - a change from wet to dry feed has reduced the environmental impact of the farms; - the national goals of the Action Plan on the Aquatic Environment of 1987 for reducing fish farm discharges of organic matter, nitrogen and phosphorus have been fulfilled. The main remaining problems are that: - the local impact of fish farms on downstream stream quality is still much too high in about 15% of cases; - the problem of the passage of migrating invertebrates and fish is still unsolved at some farms; - the problems posed by “dead reaches” are still unsolved. It is concluded that sustainable fish farming is possible in Denmark, but with the present technology production will have to be significantly reduced.

scholarly journals Study on Analysis and Sedimentation of Alumina Nanoparticles

2019 ◽  
Vol 16 (3) ◽  
pp. 510 ◽  
Author(s):  
Xuehong Zheng ◽  
Yuehan Li ◽  
Ding Chen ◽  
Airong Zheng ◽  
Qikang Que
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Ecological Risk ◽  
Sedimentation Rate ◽  
Aquatic Environment ◽  
Artificial Seawater ◽  
Alumina Nanoparticles ◽  
Natural Seawater ◽  
Ultrasonic Dispersion ◽  
Risk Effects

Dispersion and aggregation behavior of nanoparticles in aquatic environment may be affected by pH, salinity, and dissolved organic matter, which would change its ecological risk. Effects of time, power and temperature on the alumina nanoparticles (nano-Al2O3) ultrasonic dispersion in water were discussed. Al2O3 had a best ultrasonic dispersion for 30 min at 105 W and 30 °C. The concentration of Al2O3 could be measured by ultraviolet (UV) spectrophotometer, and the method was efficient and accurate. Furthermore, the sedimentation rate of Al2O3 was related to pH, salinity, and its concentration in the artificial seawater. When pH was 7.31, approaching the isoelectric point of Al2O3, they aggregated and settled fastest. Settlement coefficient (k) of Al2O3 increased by 3 and 2.7 times while the salinity and its concentration increased. The sedimentation rate was higher in natural seawater than that in artificial seawater. All results indicated that nano-Al2O3 would be removed in aquatic environment.

Characterization of dissolved organic matter for understanding the adsorption on nanomaterials in aquatic environment: A review

Chemosphere ◽  
2020 ◽  
pp. 128690
Author(s):  
Quang Viet Ly ◽  
Tahir Maqbool ◽  
Zhenghua Zhang ◽  
Quyet Van Le ◽  
Xiaochan An ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Aquatic Environment

Aggregation kinetics of microplastics in aquatic environment: Complex roles of electrolytes, pH, and natural organic matter

2018 ◽  
Vol 237 ◽  
pp. 126-132 ◽  
Author(s):  
Shuocong Li ◽  
Hong Liu ◽  
Rui Gao ◽  
Abliz Abdurahman ◽  
Juan Dai ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Aggregation Kinetics ◽  
Kinetics Of

Effects of natural organic matter on the photolysis of tetracycline in aquatic environment: Kinetics and mechanism

Chemosphere ◽  
2021 ◽  
Vol 263 ◽  
pp. 128338
Author(s):  
Chao Song ◽  
Kai-Xin Zhang ◽  
Xiao-Juan Wang ◽  
Shan Zhao ◽  
Shu-Guang Wang
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Kinetics And Mechanism

scholarly journals Transformation of CuO Nanoparticles in the Aquatic Environment: Influence of pH, Electrolytes and Natural Organic Matter

Nanomaterials ◽  
2017 ◽  
Vol 7 (10) ◽  
pp. 326 ◽  
Author(s):  
Cheng Peng ◽  
Chensi Shen ◽  
Siyuan Zheng ◽  
Weiling Yang ◽  
Hang Hu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Aquatic Environment ◽  
Cuo Nanoparticles ◽  
Influence Of Ph ◽  
Environment Influence

A THERMOGRAVIMETRIC STUDY OF ORGANIC MATTER OF REPRESENTATIVE CANADIAN PODZOL SOILS

1964 ◽  
Vol 44 (1) ◽  
pp. 7-13 ◽  
Author(s):  
M. Schnitzer ◽  
R. C. Turner ◽  
I. Hoffman
Keyword(s):  
Organic Matter ◽  
High Temperature ◽  
Low Temperature ◽  
Morphological Characteristics ◽  
Inorganic Materials ◽  
Pronounced Effect ◽  
Thermogravimetric Study ◽  
Surface Materials ◽  
Organic Matter Addition ◽  
Podzol Soils

Differential thermogravimetric (DTG) curves of untreated peat, muck, and 10 different Podzol L–H materials showed peaks at approximately 100 °C (moisture), 280° (low-temperature band), and 370 to 390 °C (high-temperature band). The maxima at 280 °C were sharp and characteristic of all surface materials investigated. The DTG curves were essentially the same for all of the Podzol L–H materials investigated.The DTG curves for 12 organic matter preparations extracted from Podzol Bh, Bfh, Bhf, Bfl, and Btf horizons showed maxima at 100 °C and in the 420 to 520 °C region (high-temperature band). The peaks at 280 °C were virtually absent in these materials. This suggested differences in composition between L–H and B horizon organic matter of the Podzols studied. The variations in the positions of the high-temperature bands of the B materials were related to the morphological characteristics of these soils in the field. From this it appeared that thermogravimetry might be a useful aid in soil classification.Addition of inorganic materials did not affect the position of the low-temperature bands but had a pronounced effect on the high-temperature bands of both L–H and B organic matter. Addition of Na caused the peaks of the latter to shift to higher temperatures while addition of Al and Fe caused shifts to lower temperatures.

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