scholarly journals Total nitrogen and total phosphorous in urban soils used for different purposes in Beijing, China

2012 ◽  
Vol 13 ◽  
pp. 95-104 ◽  
Author(s):  
Xiuli Zhao ◽  
Xinghui Xia
Keyword(s):  
Total Nitrogen ◽  
Urban Soils ◽  
Total Phosphorous ◽  
Beijing China

Levels and distribution of total nitrogen and total phosphorous in urban soils of Beijing, China

2012 ◽  
Vol 69 (5) ◽  
pp. 1571-1577 ◽  
Author(s):  
Xinghui Xia ◽  
Xiuli Zhao ◽  
Yunjia Lai ◽  
Haiyang Dong
Keyword(s):  
Total Nitrogen ◽  
Urban Soils ◽  
Total Phosphorous ◽  
Beijing China

Heavy metals in urban soils with various types of land use in Beijing, China

2011 ◽  
Vol 186 (2-3) ◽  
pp. 2043-2050 ◽  
Author(s):  
Xinghui Xia ◽  
Xi Chen ◽  
Ruimin Liu ◽  
Hong Liu
Keyword(s):  
Heavy Metals ◽  
Land Use ◽  
Urban Soils ◽  
Beijing China

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 Effects of land use intensity on the natural attenuation capacity of urban soils in Beijing, China

2015 ◽  
Vol 117 ◽  
pp. 89-95 ◽  
Author(s):  
Meie Wang ◽  
Jack H. Faber ◽  
Weiping Chen ◽  
Xiaoma Li ◽  
Bernd Markert
Keyword(s):  
Land Use ◽  
Natural Attenuation ◽  
Urban Soils ◽  
Land Use Intensity ◽  
Effects Of Land Use ◽  
Beijing China

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.  

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>

Sign in / Sign up

Export Citation Format

Share Document