Chemical sediment variables from the Faroe area: Organic content, Nitrogen, Phosphorus, Zinc, and Copper / Evnafrøðiligar bleytbotnsdátur á føroyskum havøki: lívrunnið tilfar, nitrogen, fosfor, sink og kopar

2017 ◽  
Vol 57 ◽  
pp. 159
Author(s):  
Jan Sørensen ◽  
Jákup K. Bærentsen ◽  
Jógvan F. Hansen ◽  
Ámundur Nolsø ◽  
Birna V. Trygvadóttir
Keyword(s):  
Total Nitrogen ◽  
Organic Content ◽  
Loss On Ignition ◽  
Marine Biological Laboratory ◽  
Total Phosphorous ◽  
Sediment Types ◽  
Chemical Sediment ◽  
Inshore Waters ◽  
Sediment Data ◽  
Nitrogen Phosphorus

<p><strong>Ú</strong><strong>r</strong><strong>t</strong><strong>ak</strong>: Havlívfrøðiliga royndarstøðin hevur síðan 1998 gjørt regluligar kanningar av botnsigi í føroyskum firðum. Kanningarnar fevndu um fylgjandi evnafrøðiligu brigdlar: nøgd av lívrunnum tilfari (gløðitap), sinki, kopari og heildarnøgd av køvievni og fosfori. Greinin viðger broytni av hesum og fevnir um 229 staksýni.</p><p>Í hesi grein eru eisini savnað úrslit, sum onnur hava almannakunngjørt um somu evnafrøðiligu broytlar.</p><p>Úrslitini eru bólkað eftir dýpi og eftir hvørjum slagi av botnsigi, ið tað snýr seg um. Eisini verður hugt eftir, hvussu virðini eru inni við land og borið verður saman við, hvussu tað er útiá.</p><p>Inni við land var nøgdin av lívrunnum tilfari, nitrogeni, fosfori, sinki og kopari í botnsiginum ávikavist: 0,5-13,0 %, 0,14-4,01 g/kg, 0,43-2,02 g/kg, 12-98 mg/kg og 14-120 mg/kg. Útiá var innihaldið av lívrunnum tilfari millum 1,3 og 5,6 %, meðan innihaldið av sinki og kopari vóru 13-47 mg/kg og 5-38 mg/kg.</p><p><strong>A</strong><strong>bstract</strong>: Since 1998 Kaldbak Marine Biological Laboratory (KMBL) has regularly performed seabed surveys in Faroese fjords. The analyses performed on the sediments included the chemical variables: Organic content (loss on ignition), total nitrogen, total phosphorus, zinc and copper. This paper deals with the variability of the variables in the Faroe area.</p><p>The results of 229 seabed samples are included. Inshore data are compared and related to depth intervals and according to sediment types. Sediment data from inshore waters are compared to sediment data from offshore localities.</p><p>Also included in this paper are eight reports that include data on the above mentioned chemical variables.</p><p>From inshore waters the concentration of organic matter, total nitrogen, total phosphorous, zinc and copper in the sediments was, respectively: 0.5-13.0 %, 0.14-4.01 g/kg, 0.43-2.02 g/kg, 12-98 mg/kg and 14-120 mg/kg. Organic content from offshore localities showed values from 1.3 to 5.6 % while the content of zinc and copper were 13-47 mg/kg and 5-38 mg/kg, respectively.</p>

scholarly journals One-step Oxidation of Total Organic Carbon, Total Nitrogen, and Total Phosphorous using Wet Chemical Oxidation

2020 ◽  
Vol 42 (12) ◽  
pp. 603-609
Author(s):  
Jeong-Hwan Choi ◽  
Dong-Hun Shin ◽  
Hye-Bin Kim ◽  
Jong-Gook Kim ◽  
Kitae Baek
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Total Nitrogen ◽  
Uv Irradiation ◽  
Oxidation Process ◽  
Irradiation Time ◽  
Suitable Condition ◽  
Chemical Oxidation ◽  
Total Phosphorous ◽  
Wet Chemical

Objective:This study proposed the simultaneous multi-oxidation of total organic carbon, total nitrogen, and total phosphorous using modified wet chemical oxidation method.Methods:The multi oxidation process was based on the dual radical system with sulfate and hydroxyl radicals. The sodium persulfate (Na2S2O8) and sodium hydroxide (NaOH) were activated at 40℃ and UV irradiation with 254 nm to generate the sulfate radical and hydroxyl radical. The organic matters were oxidized by the dual radicals, and TOC, TN, and TP values were compared with the control group.Results and Discussion:The dual radical system oxidized organic carbon to carbon dioxide effectively, and the TOC values were similar to the value obtained from the high-temperature combustion technique. However, the residual persulfate after oxidation process interfered the absorbance for TN and inhibit the complexation in TP measurement. The residual persulfate was effectively converted to sulfate by longer heating and UV irradiation, and the interferences were more sensitive to reaction temperature than UV irradiation time. As a result, a higher temperature condition was more effective and enhanced the applicability of multi-oxidation.Conclusions:The multi oxidation of TOC, TN, and TP was demonstrated by wet chemical oxidation, and the proposed method is expected to secure the sample and reduce the analytic time. However, the more suitable condition to enhance the accuracy of TOC, TN, and TP in the multi-oxidation system should be studied further.

scholarly journals Nutrient status of rangeland in upper Mustang

2015 ◽  
Vol 24 (1) ◽  
pp. 41-46
Author(s):  
M. Maharjan ◽  
K. D. Awasthi ◽  
K. R. Pande ◽  
N. Thapa
Keyword(s):  
Total Nitrogen ◽  
Soil Depth ◽  
Soil Nutrient ◽  
Nutrient Status ◽  
Available Phosphorus ◽  
Top Soil ◽  
Palatable Species ◽  
North And South ◽  
Nitrogen Phosphorus ◽  
Livestock Rearing

The study aimed at assessing the nutrient status of rangeland in upper Mustang. The assessment is necessary to know about the soil quality or productivity of soil of rangeland. Livestock rearing is one of the main occupations in upper Mustang but nowadays due to lack of palatable species for livestock, people are leaving the occupation which is directly affecting their livelihood status. Therefore this research was carried out to find out if the soil nutrient is the reason behind the lack of availability of palatable species in the rangeland. For soil sampling, north and south aspects were taken. In case of altitude, 3850 m, 3650 m and 3450 m were taken. Soil samples were taken from soil profile up to 60cm depth at interval of 20 cm. Available phosphorus and available potassium were found to be high at north aspect but total nitrogen was found to be high at south aspect. Both total nitrogen and available phosphorus were found to be high at 3650 m. Available potassium was gradually decreased with increasing altitude. Total nitrogen, available potassium and available phosphorus were gradually decreased with increasing soil depth. Nutrient status was high at top soil (0-20 cm).The soil nutrient (Nitrogen, Phosphorus, Potassium) status was found to be good in the study area. Further research on biophysical and ecological aspect of Rangeland in Upper Mustang is necessary to manage it properly.Banko Janakari, Vol. 24, No. 1, PP. 41-46

Influence of chemical properties on nitrogen mineralization and nitrification in podzolized sands. Implications for forest management

Soil Research ◽  
1990 ◽  
Vol 28 (6) ◽  
pp. 981 ◽  
Author(s):  
JC Carlyle ◽  
JR Lowther ◽  
PJ Smethurst ◽  
EKS Nambiar
Keyword(s):  
Forest Management ◽  
Total Nitrogen ◽  
Nitrogen Mineralization ◽  
Management Practices ◽  
Organic Phosphorus ◽  
Chemical Properties ◽  
South Australia ◽  
Major Effect ◽  
Correct Classification ◽  
Loss On Ignition

The relationship between selected chemical properties and nitrogen mineralization and nitrification was examined in soils collected from 39 sites of varying history. All sites were on podzolized sands; such soils represent more than 95% of the P. radiata growing area in south-east of South Australia/western Victoria. Given their uniformity in texture and similarity in pedogenesis, the organic matter concentrations of the sampled soils were highly variable (loss-on-ignition 0.8-10.2%). Total nitrogen was highly correlated with loss-on-ignition (r2 = 0.95, P<0.001). Nitrogen mineralization was correlated neither with total nitrogen nor loss-on-ignitition (i.e. P > 0.05), but was correlated with organic phosphorus (r2 = 0 70, P < 0.001), suggesting a major effect of phosphorus on nitrogen mineralization in these soils. On the basis of nitrate production during a 56-day aerobic incubation of disturbed soil, 18 soils were classed as strongly nitrifying (having a high potential to nitrify) and 18 as weakly nitrifying (having a low potential to nitrify). This separation reflected differences in other soil properties, with discriminant analysis giving a 91.7% correct classification into the two groups using only pH and Bray (II) extractable phosphorus for discrimination. Strongly and weakly nitrifying groups could also be discriminated on the basis of their value/chroma rating (after ignition), with a 94.4% probability of correct classification. Within each classification, nitrogen mineralization was correlated with total nitrogen (r2 =0.59 and 0.65, P< 0.001, for strongly and weakly nitrifying soils, respectively) but with a different relationship in each case. The significance of this difference in nitrogen dynamics is discussed in relation to site-specific forest management practices.

Ecotoxicity and chemical sediment data classification by the use of self-organising maps

2009 ◽  
Vol 631 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Stefan Tsakovski ◽  
Blazej Kudlak ◽  
Vasil Simeonov ◽  
Lidia Wolska ◽  
Jacek Namiesnik
Keyword(s):  
Data Classification ◽  
Use Of Self ◽  
Chemical Sediment ◽  
Sediment Data

A mass balance study on nitrification and deammonification in vertical flow constructed wetlands treating landfill leachate

2007 ◽  
Vol 56 (3) ◽  
pp. 117-123 ◽  
Author(s):  
G. Sun ◽  
D. Austin
Keyword(s):  
Mass Balance ◽  
Total Nitrogen ◽  
Landfill Leachate ◽  
Nitrogen Loss ◽  
Organic Content ◽  
Vertical Flow ◽  
Ammoniacal Nitrogen ◽  
High Concentration ◽  
Balance Study ◽  
Mass Balance Study

A laboratory-scale, mass-balance study was carried out on the transformation of nitrogenous pollutants in four vertical flow wetland columns. Landfill leachate containing low organic matter, but a high concentration of ammoniacal-nitrogen, was treated under dissolved oxygen concentrations close to saturation. Influent total nitrogen (TN) comprised ammoniacal-nitrogen with less than 1% nitrate and nitrite, negligible organic nitrogen, and very low BOD. Nitrification occurred in three of the four columns. There was a substantial loss of total nitrogen (52%) in one column, whereas other columns exhibited zero to minor losses (&lt;12%). Nitrogen loss under study conditions was unexpected. Two hypotheses are proposed to account for it: (1) either the loss of TN is attributed to nitrogen transformation into a form (provisionally termed α-nitrogen) that is undetectable by the analytical methods used; or (2) the loss is caused by microbial denitrification or deammonification. By elimination and stoichiometric mass balance calculations, completely autotrophic nitrogen-removal over nitrite (CANON) deammonification is confirmed as responsible for nitrogen loss in one column. This result reveals that CANON can be native to aerobic engineered wetland systems treating high ammonia, low organic content wastewater.

Ecological relationships of wild rice, Zizania aquatica. 5. Enhancement of wild rice production by Potamogeton robbinsii

1987 ◽  
Vol 65 (7) ◽  
pp. 1433-1438 ◽  
Author(s):  
P. F. Lee
Keyword(s):  
Discriminant Analysis ◽  
Bulk Density ◽  
Wild Rice ◽  
Organic Content ◽  
Loss On Ignition ◽  
Sediment Samples ◽  
Ecological Relationships ◽  
Zizania Aquatica ◽  
Limiting Nutrient ◽  
Clay Sediment

Production of wild rice in a lake with clay sediment was examined inside and outside clumps of Potamogeton robbinsii (L.). Dry weights of wild rice plants were 10–15 times greater inside than outside these clumps. Analyses of variance of sediment samples revealed that values of loss on ignition, phosphorus, manganese, and zinc were higher inside the clumps of P. robbinsii, while values of bulk density, pH, and water depth were higher outside the clumps. Discriminant analysis was able to separate the samples on the basis of the values of phosphorus, manganese, and zinc relative to bulk density, copper, calcium, and depth. Experiments with various fertilizer treatments under controlled conditions determined that the primary limiting nutrient in the sediment outside the P. robbinsii clumps was phosphorus. It was proposed that as Potamogeton robbinsii decayed, it increased the organic content of the clay sediment, thereby lowering the pH and increasing the availability of nutrients.

scholarly journals Comparison of Adsorptive Removal of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution using Granular Activated Charcoal (GAC)

2013 ◽  
Vol 9 (1) ◽  
pp. 1822-1836
Author(s):  
Keon Sang Ryoo ◽  
Jong-Ha Choi ◽  
Yong Pyo Hong
Keyword(s):  
Aqueous Solution ◽  
Kinetic Model ◽  
Adsorption Capacity ◽  
Total Nitrogen ◽  
Activated Charcoal ◽  
Adsorption Equilibrium ◽  
Order Kinetic ◽  
Total Phosphorous ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The present study is to explore the possibility of utilizing granular activated charcoal (GAC) for the removal of total phosphorous (T-P) and total nitrogen (T-N) in aqueous solution. Batch adsorption studies were carried out to determine the influences of various factors like initial concentration, contact time and temperature. The adsorption data showed that GAC has a similar adsorption capacity for both T-N and T-P. The adsorption degree of T-N and T-P on GAC was highly concentration dependent. It was found that the adsorption capacity of GAC is quite favorable at a low concentration. At concentrations of 1.0 mg L-1 of T-P and 2.0 mg L-1 of T-N, approximately 97 % of adsorption was achieved by GAC. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher R2 compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium qe,cal from pseudo-second-order kinetic model were relatively similar to the experimental adsorption equilibrium qe,exp. To evaluate the effect of thermodynamic parameters at different temperatures, the change in free energy ΔG, the enthalpy ΔH and the entropy ΔS were estimated. Except for adsorption of T-P at 278 K, the ΔG values obtained were all negative at the investigated temperatures. It indicates that the present adsorption system occurs spontaneously. The adsorption process of T-N by GAC was exothermic in nature, whereas T-P showed endothermic behavior. In addition, the positive values of ΔS imply that there was the increase in the randomness of adsorption of T-N and T-P at GAC-solution interface.  

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