• International Journal of Mineral Processing

    2019 7 11 the samples were determined by using BET model Nova1200e The conditions for BET analysis were sample degasification for 2 h at 200 C nitrogen gas and isotherm of 8 points Fig 2 Weight loss as a function of size fraction of the manganese silicate–carbonate ore tailing performed in nitrogen TA Q50 and air tubular furnace atmospheres

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  • Cannabis Potency Analysis by GC FID with Nitrogen

    2021 10 6 The QC sample was analysed using ten injections The average concentration for CBC was 27 6 µg/ml with an RSD of 1 52 CBD was 27 7 µg/ml with an RSD of 1 24 8 THC was 28 1 µg/ml with an RSD of 1 63 9 THC was 28 3 µg/ml with an RSD of 1 36 CBG was 27 6 with an RSD 1 25 and CBN was 28 0 with an RSD of 1 49

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  • Chemolithoautotropic Diazotrophy Dominates the

    nitrogen fertilizer production are expensive and labor consuming tasks 9 Biological nitrogen fixation which is an essential ecosystem function required by the tailing microbial

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  • CHNS Elemental Analysers

    2020 7 24 determination of carbon hydrogen nitrogen and sulphur in organic matrices and other types of materials They are capable of handling a wide variety of sample types including solids liquids volatile and viscous samples in the fields of pharmaceuticals

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  • Sample Preparation

    2019 6 10 Sample Preparation Grinding the tissues with liquid nitrogen fully then using 1mL ice PBS with PIC to dissolved powder to obtain the suspension Formaldehyde is used to cross link the proteins to the DNA The 4ug antibody combine with 400uL PBS and BSA will used to incubation

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  • Mercury contamination in soil tailing and plants on

    Some soil samples were taken from uncontaminated site as a reference to compare the results Tailing sample was collected from tailing pile near agricultural field Edible part of food crops grown naturally on contaminated and uncontaminated soils was also collected Soil and tailing were air dried and plant samples were dried at 70oC for two

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  • LIQUID NITROGEN FLUORESCENCE STUDIES OF THE

    2018 6 16 Liquid nitrogen temperature in vivo fluorescence emission spectra have been determined for the blue green algae Anacystis nidulans 1402 1 University of G6ttingen Anabaena cylindrica Lemm 1403/2a and Chlorogloea fritschii 1411/1 both from the Culture Collection of Algae

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  • Advanced GC MS Blog Journal Peak Tailing Like an

    2013 3 20 We found that peak tailing like an iceberg is much more harmful than commonly perceived In GC MS peak tailing can originate at the GC column but the main source of the phenomenon is the ion source an under heated transfer line induces more peak broadening than asymmetric peak tailing

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  • What Is Cannabis Foxtailing And What Causes It

    2019 3 12 The wet dry cycle can be pushed to the extreme for example some high mountain Kush strains love dry feet Nitrogen and fertiliser sensitivity is a common feature to sativas Many growers find that feeding bloom nutrients that are low in nitrogen by nature serve the plant best all throughout its life cycle even feeding at half to a

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  • Geochemical Perspectives Letters A new journal of the

    2021 9 3 Geochemical Perspectives Letters is an internationally peer reviewed journal of the European Association of Geochemistry produced by and for the geochemical community Open access Short 3000 words all inclusive Highest quality articles spanning geochemical sciences About the journal

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  • What is Peak Tailing

    2021 8 29 There are two main methods for defining peak tailing Tailing factor Tf widely used in the pharmaceutical industry Let a and b be the peak half widths at 5 of the peak height a is the front half width b is the back Tf = a b 2a Asymmetry factor As used in most other industries As in Tf a and b are the peak half widths

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  • What Causes Peak Tailing in HPLC

    2021 6 1 Poor peak shape includes both peak fronting and peak tailing How Is Peak Shape Measured USP Tailing Factor W 0 05 is the Width of the peak determined at 5 from the baseline of the peak height f is the distance between peak maximum and peak front at W 0 05 Asymmetry Peak Width at ½ Height What Factors Affect HPLC Peak Tailing

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  • Investigation of Band Tailing in Sputtered ZnO Al Thin

    2017 2 3 nitrogen for both sample series but the resulting electrical properties vary in between samples deposited with oxygen or nitrogen addition Apparently nitrogen can only be incorporated during deposition but already incorporated nitrogen can lead to the activation of acceptor like defects during thermal treatment B 2 Influence of oxygen

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  • δ15N measurement of organic and inorganic substances

    These unexpected results were shown to be related to the tailing of the nitrogen peak of nitrate containing compounds A series of experiments were set up to investigate the cause of this phenomenon using ammonium nitrate NH 4 NO 3 and potassium nitrate KNO 3 samples two organic laboratory standards as well as the international

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  • Final TIPS and Tricks HPLC Troubleshooting 2

    2016 9 11 Peak Tailing Identifying Column Secondary Interactions Tip Mobile phase modifier TEA competes with Sample for surface ion exchange sites at mid range pH values Column Alkyl C8 4 6 x 150 mm 5 μm Mobile Phase 85 25 mM Na 2HPO 4 pH 7 0 15 ACN Flow Rate 1 0 mL/min Temperature 35 C Sample 1

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  • Peak Tailing in HPLC

    2017 9 18 Peak tailing is the most common chromatographic peak shape distortion We want to address how to go about fixing these distortions but first let s understand what causes peak tailing Peak tailing occurs when the peak asymmetry factor As is greater than 1 2 although peaks with As greater than 1 5 are acceptable for many assays

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  • Tailing miniSOG structural bases of the complex

    2019 2 20 The luminescence exiting from the sample was filtered by a 1100 nm long pass filter Edmund Optics York U K and a narrow bandpass filter

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  • Peak Tailing and Resolution R

    compromised by tailing peaks If I wanted to regain the resolution of Figure 1a from the situation of Figure 1d I would need to either move the peak centers apart gener ally at the cost of run time or make chemi cal changes to reduce the peak tailing Peak tailing often can be minimized by using the newer Type B silica columns or mobile

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  • LIQUID NITROGEN FLUORESCENCE STUDIES OF THE

    2018 6 16 Liquid nitrogen temperature in vivo fluorescence emission spectra have been determined for the blue green algae Anacystis nidulans 1402 1 University of G6ttingen Anabaena cylindrica Lemm 1403/2a and Chlorogloea fritschii 1411/1 both from the Culture Collection of Algae

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  • 6890 Nitrogen Phosphurous Detector Recommended

    2016 9 8 variety of sample matrixes it is difficult to guarantee a consumable such as NPD beads for a specific finite time frame We have had NP beads last from 75 to over a 1000 hours of actual operation This means that the detector is operating and samples being run fairly routinely A customer who is not actually running sample

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  • Utilization of Iron Ore Tailing for the Preparation of α

    tailing B Characterization of α Fe 2 O 3 Fig 2 was the XRD pattern of α Fe 2 O 3 prepared from iron ore tailing The major diffraction peaks are consistent with the data of standard α Fe 2 O 3 sample No detectable impurities were noted in the XRD pattern This demonstrated that the prepared sample was composed of high

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  • Gas Chromatography Liner Selection Guide

    2020 12 17 gaseous sample If the diameter of the liner is too small the sample will expand beyond the capacity of the liner This will result in sample loss both through the septum purge flow and split line and give disrupted sample transfer onto the column This will likely be seen as peak tailing and poor peak area reproducibility

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  • Influences of oxidation ability on precision in nitrogen

    2021 5 5 Our results showed that sufficient oxygen should be injected to improve the sample combustion when analyzing δ 15 N in natural samples such as soil or marine sediment with low organic content In addition the measurement precision of δ 15 N was affected by the tailing of the CO 2 peak from the gas chromatography column into the subsequent

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  • Efficiency of biochar nitrogen addition and microbial

    2021 6 19 2 1 Soil sampling 2 were randomly located in a tailing slope of an opencast coal mining area in which five soil samples 0–30 cm were collected for each sample plot with a soil coring kit 20 cm in diameter for a total of 25 soil samples with a total weight of 50 kg All soil samples were thoroughly homogenized into one composite sample

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  • Tailing of Chromatographic Peaks in GC–MS Caused by

    2013 6 18 The second example in which halogenated solvents were associated with peak tailing are the GC–ECNI MS experiments of Kassel et al in which the ion source was briefly exposed to CCl 4 CHCl 3 or CH 2 Cl 2 to generate M Cl − ions The electron source remained switched off during the halogenated solvent treatment

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  • Assessing Nitrogen Legacies in Western Europe

    2021 4 26 Large sample long term databasis of catchment N inputs and outputs allows estimation of N transport time distribution by deconvolving time series Although TTs are often rather short the combination of input history and tailing of TTD lead to a large hydrologic legacy of mobile nitrate in the catchments note that this is the „best

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  • Gas Chromatography Liner Selection Guide

    2020 12 17 gaseous sample If the diameter of the liner is too small the sample will expand beyond the capacity of the liner This will result in sample loss both through the septum purge flow and split line and give disrupted sample transfer onto the column This will likely be seen as peak tailing and poor peak area reproducibility

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  • Advanced GC MS Blog Journal Peak Tailing Like an

    2013 3 20 We found that peak tailing like an iceberg is much more harmful than commonly perceived In GC MS peak tailing can originate at the GC column but the main source of the phenomenon is the ion source an under heated transfer line induces more peak broadening than asymmetric peak tailing

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  • Positive effects of plant diversity on soil microbial

    2020 9 17 collected and combined into one sample A part of each soil sample was air dried and homogenized and sieved <2 mm to remove plant roots and small stones and was used to ana lyze soil total nitrogen total phosphorus and organic matter Another part of each soil sample was homogenized and plant roots and small stones were removed Some of

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  • Influences of oxidation ability on precision in nitrogen

    2021 5 5 Our results showed that sufficient oxygen should be injected to improve the sample combustion when analyzing δ 15 N in natural samples such as soil or marine sediment with low organic content In addition the measurement precision of δ 15 N was affected by the tailing of the CO 2 peak from the gas chromatography column into the subsequent

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  • Evaluation of copper tailing amendments through poultry

    2020 10 24 Abstract In this study two amendments poultry waste and ammonium nitrate were evaluated to condition and stabilize a mine tailing and thus help the vegetation cover settle Individually ammonium nitrate was tested as a nitrogen source and chicken bone ash as a phosphate source For this laboratory tests were made on soil columns from the area to be remediated The mobility and

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  • Fluoride chloride nitrate and sulfate in aqueous

    2002 9 26 operator can analyze about 32 samples including blank calibration standards and reference sample solutions in a normal 8 hour day An additional 66 samples can be analyzed overnight Fluoride is generally determined from 08 to 4 mg/L chloride from 0 08 to 4 mg/L nitrate from

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  • Advanced GC MS Blog Journal Peak Tailing Like an

    2013 3 20 We found that peak tailing like an iceberg is much more harmful than commonly perceived In GC MS peak tailing can originate at the GC column but the main source of the phenomenon is the ion source an under heated transfer line induces more peak broadening than asymmetric peak tailing

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  • Diversity of free living nitrogen fixing microorganisms in

    Biological nitrogen fixing is an important source of nitrogen input in the natural ecological restoration of mine wastelands The diversity of nifH genes in tailings samples under different plant communities in Yangshanchong and Tongguanshan wastelands in Tongling was analyzed using polymerase chain reaction denaturing gradient gel electrophoresis PCR DGGE approach

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  • Diversity of free living nitrogen fixing microorganisms in

    2012 3 20 The composition of free living nitrogen fixing microbial communities in rhizosphere and non rhizosphere of pioneer plants growing on wastelands of copper mine tailings was studied by the presence of nifH genes using Polymerase Chain Reaction Denatured Gradient Gel Electrophoresis PCR DGGE approach Eleven rhizosphere tailing samples and nine non rhizosphere tailing samples from six plant

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  • EA IRMS Accurate and Precise Weight O and

    2016 9 1 nitrogen rich sample matrices1 2 3 N 2 and CO are formed in the reactor during the pyrolysis of nitrogen rich sample matrices However without complete chromatographic separation of any tailing N 2 peaks N 2 masses will be collected during isotopic analysis

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  • Peak Tailing and Resolution R

    compromised by tailing peaks If I wanted to regain the resolution of Figure 1a from the situation of Figure 1d I would need to either move the peak centers apart gener ally at the cost of run time or make chemi cal changes to reduce the peak tailing Peak tailing often can be minimized by using the newer Type B silica columns or mobile

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  • SFL8 Summary of Validated Methods

    2019 4 25 Sample Preparation As a general screening method the sample solution preparation is primarily at the analyst s discretion Any GC FID suitable solvent can be used to include methanol chloroform ether hexane etc Sample concentration is also at the analyst s discretion

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  • Wet Deposition of Atmospheric Nitrogen and Phosphorus

    Spatiotemporal variations of nitrogen N and phosphorus P and its impact on water pollution are significant to water ecosystem govern and recovery in sand source area Most previous studies are performed in coastal areas the Yangtze River Basin and southern of China While for reservoirs in sand source with more drought less precipitation more windy and evaporation is far greater than

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  • Peak Tailing in HPLC

    2017 9 18 Peak tailing is the most common chromatographic peak shape distortion We want to address how to go about fixing these distortions but first let s understand what causes peak tailing Peak tailing occurs when the peak asymmetry factor As is greater than 1 2 although peaks with As greater than 1 5 are acceptable for many assays

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