Total Nitrogen Phosphorus

  • Total nitrogen and community turnover determine

    The concentrations of total nitrogen (TN), total phosphorus (TP), dissolved phosphate (PO 4 3−P), and permanganate index (COD Mn) in lake water were determined following standard methods (State Environmental Protection Administration of China,

  • Total nitrogen and community turnover determine phosphoruTotal nitrogen and community turnover determine phosphoruTotal nitrogen and community turnover determine phosphoruCSDN 专业开发者社区知乎专栏 随心写作，自由表达 知乎

  • Total Nitrogen & Phosphorus Analysis Thermo Fisher

    A new method for analysis of total nitrogen and phosphorus. The traditional method for measuring total nitrogen has the following drawbacks: TKN determination uses toxic

  • Frontiers Drivers of Soil Total Nitrogen and Phosphorus

    Although soil total nitrogen (STN) and soil total phosphorus (STP) play significant roles in terrestrial ecosystem function, their storage and driving factors in the

  • Storage, Distribution, and Associated Controlling Factors of Frontiers Distribution Characteristics and Controlling Factor

  • Total nitrogen, total phosphorus, and nutrient limitation in

    Total nitrogen (TN) and total phosphorus (TP) measurements and contemporaneous measurements of chlorophyll a (Chl a) and phytoplankton nutrient

  • Total Nitrogen & Phosphorus Analysis Thermo Fisher

    A new method for analysis of total nitrogen and phosphorus. The traditional method for measuring total nitrogen has the following drawbacks: TKN determination uses toxic

  • Removal of Total Nitrogen and Phosphorus Using Single

    Abstract. Phytoremediation is a potentially suitable technology for taking up large amounts of N and P during plant growth and the removal of plant material,

  • Soil organic carbon, total nitrogen, available nutrients, and

    The results showed that straw burying significantly increased soil organic carbon (SOC), soil total nitrogen (STN), soil total phosphorus (STP), soil total potassium

  • Spatial distribution patterns of soil total phosphorus

    Phosphorus (P) is an important element in terrestrial ecosystems and plays a critical role in soil quality and ecosystem productivity. Soil total P distributions have

  • How I can calculate the Total Nitrogen (TN) and

    Calculate the annual uptake of P by both plants and soil. Annual plant uptake P = 30 kg/ha Annual soil P sorption uptake = 4000 kg/ha divided by 50 years = 80 kg/ha Total annual P capacity = (30

  • Characteristics of Nitrogen and Phosphorus Losses and

    The average concentration of total nitrogen(TN) and total phosphorus(TP) reached 10. 05 mg·L~(1) and 1. 10 mg·L~(1),far exceeding the occurrence standard of

  • Total nitrogen and community turnover determine

    The concentrations of total nitrogen (TN), total phosphorus (TP), dissolved phosphate (PO 4 3−P), and permanganate index (COD Mn) in lake water were determined following standard methods (State Environmental Protection Administration of China, 2002). The samples were filtered with a Whatman GF/F filter (biomass intercepted by 0.7 µm

  • Are nitrogentophosphorus ratios of Chinese

    Tong et al. demonstrate an increased mass ratio of total nitrogen to total phosphorus (TN:TP) and decreased TP concentration in many Chinese lakes in association with widespread construction of

  • Simultaneous determination of total nitrogen and total

    Here, we used an electrolytically generated hydroxide eluent combined with a highcapacity, hydroxideselective, anionexchange column for the determination of total nitrogen (as nitrateN) and total phosphorus (as phosphateP) in environmental samples by IC. This method yielded LODs for nitrateN and phosphateP of 1.0 and 1.3

  • Total Nitrogen & Phosphorus Analysis Thermo Fisher

    A new method for analysis of total nitrogen and phosphorus. The traditional method for measuring total nitrogen has the following drawbacks: TKN determination uses toxic mercury. TKN determination is subject to interferences by high concentrations of nitrate. Multiple methods used for determination of different nitrogen sources add complexity.

  • Removal of Total Nitrogen and Phosphorus Using Single

    Abstract. Phytoremediation is a potentially suitable technology for taking up large amounts of N and P during plant growth and the removal of plant material, thereby avoiding eutrophication. We compared the capacity of nine different aquatic plant species for removing total P (TP), total N (TN), and NH 4+ N from raw domestic sewage wastewater

  • Frontiers Runoff regulation and nitrogen and phosphorus

    The performance of the media including runoff reduction, nitrate nitrogen (NO3N) removal, ammonium nitrogen (NH4+N) removal, and total phosphorus (TP) removal were assessed by column experiment. The effect of different level of modification, ratio of zeolite in substrate, and rainfall intensity on media performance were investigated.

  • How I can calculate the Total Nitrogen (TN) and

    Calculate the annual uptake of P by both plants and soil. Annual plant uptake P = 30 kg/ha Annual soil P sorption uptake = 4000 kg/ha divided by 50 years = 80 kg/ha Total annual P capacity = (30

  • Methods of Analysis by the U.S. Geological Survey

    Determination of Total and Dissolved Nitrogen and Phosphorus in Water By Charles J. Patton and Jennifer R. Kryskalla Abstract Alkaline persulfate digestion was evaluated and validated as a more sensitive, accurate, and less toxic alternative to Kjeldahl digestion for routine determination of nitrogen and phosphorus in surface

  • Nitrogen and phosphorus additions accelerate

    Nitrogen (N) and phosphorus (P) additions reduced soil organic carbon (SOC) contents and stocks in alpine meadows on the Tibetan Plateau. However, little is known about microbial mechanisms behind SOC decline. Results showed that the total SOC pool was reduced by 2–9% under N and P additions, of which slow C pool

  • Characteristics of Nitrogen and Phosphorus Losses and

    The average concentration of total nitrogen(TN) and total phosphorus(TP) reached 10. 05 mg·L~(1) and 1. 10 mg·L~(1),far exceeding the occurrence standard of eutrophication,which should be cause for concern. The nitrate nitrogen(NN) and particulate phosphorus(PP) in the rainfall were 69. 47 kg and 6. 83 kg on August

  • Simultaneous determination of total nitrogen and total

    Here, we used an electrolytically generated hydroxide eluent combined with a highcapacity, hydroxideselective, anionexchange column for the determination of total nitrogen (as nitrateN) and total phosphorus (as phosphateP) in environmental samples by IC. This method yielded LODs for nitrateN and phosphateP of 1.0 and 1.3

  • Nitrogen and phosphorus removal in simulated

    The results showed that the removal rate of total nitrogen (TN) in medium and highpollutant concentration water samples and total phosphorus (TP) in medium and lowpollutant concentration water with I. ensata reached more than 75%. Li Y, Li S, Chen H, Zhuang P, Wang F () Removal of total nitrogen and phosphorus using single or

  • Frontiers Runoff regulation and nitrogen and phosphorus

    The performance of the media including runoff reduction, nitrate nitrogen (NO3N) removal, ammonium nitrogen (NH4+N) removal, and total phosphorus (TP) removal were assessed by column experiment. The effect of different level of modification, ratio of zeolite in substrate, and rainfall intensity on media performance were investigated.

  • Total nitrogen estimation in agricultural soils via aerial

    Measuring soil health indicators (SHIs), particularly soil total nitrogen (TN), is an important and challenging task that affects farmers’ decisions on timing, placement, and quantity of

  • Effect of Rational Fertilizer for Eggplants on Nitrogen and

    Total nitrogen, total phosphorus, and organic phosphorus concentrations in water decrease the most during flowering and maturity because of increased root uptake and nutrient utilization capacity in late plant growth; Nendel et al. found that in dry or temperate environments, potentially mineralized nitrogen accounts for a higher

  • Eutrophication of lakes cannot be controlled by reducing

    Concentrations of total phosphorus (TP) in the epilimnion during icefree season in all years of fertilization averaged 42 μg/liter (Fig. 2A). Total nitrogen (TN) in Lake 227 averaged 825 μg of N per liter in 1969–1974, the period when high N fertilizer was added (Fig. 2C). It stayed constant for several years after N fertilizer was

  • Estimation of Total Nitrogen and Phosphorus in New

    The New England SPARROW models for total nitrogen and total phosphorus have Rsquared values of 0.95 and 0.94, with mean square errors of 0.16 and 0.23, respectively. Variables that were statistically significant in the total nitrogen model include permitted municipalwastewater discharges, atmospheric deposition, agricultural area, and

  • The nitrogen : phosphorus relationship in lakes ASLO

    The nitrogen : phosphorus relationship in lakes John A. Downing Departement de Sciences biologiques, Universite de Montreal, C.P. 6 128, Succursale A, Montreal, Quebec H3C Published data on mean annual epilimnetic total N (TN) and P (TP) were analyzed to find how TN : TP varies with lake trophic status.

  • Characteristics of Nitrogen and Phosphorus Losses and

    The average concentration of total nitrogen(TN) and total phosphorus(TP) reached 10. 05 mg·L~(1) and 1. 10 mg·L~(1),far exceeding the occurrence standard of eutrophication,which should be cause for concern. The nitrate nitrogen(NN) and particulate phosphorus(PP) in the rainfall were 69. 47 kg and 6. 83 kg on August

  • Nitrogen and phosphorus additions accelerate

    Nitrogen (N) and phosphorus (P) additions reduced soil organic carbon (SOC) contents and stocks in alpine meadows on the Tibetan Plateau. However, little is known about microbial mechanisms behind SOC decline. Results showed that the total SOC pool was reduced by 2–9% under N and P additions, of which slow C pool