Determination of Phosphorus, Potassium, Calcium, and Magnesium Simultaneously in North Carolina, Ammonium Acetate, and Bray P1 Soil Extracts by AutoAnalyzer

2015 ◽  
pp. 97-112
Author(s):  
R. L. Flannery ◽  
D. K. Markus
Keyword(s):  
North Carolina ◽  
Ammonium Acetate ◽  
Soil Extracts ◽  
Calcium And Magnesium ◽  
Bray P1

Automated Analysis of Soil Extracts for Phosphorus, Potassium, Calcium, and Magnesium

1980 ◽  
Vol 63 (4) ◽  
pp. 779-787 ◽  
Author(s):  
Roy L Flannery ◽  
Denes K Markus
Keyword(s):  
Atomic Absorption ◽  
Ammonium Acetate ◽  
Sandy Loam ◽  
Acid Soil ◽  
Extraction Methods ◽  
Soil Extraction ◽  
Soil Extracts ◽  
Loam Soil ◽  
Bray P1 ◽  
Acid Extractant

Abstract An automated method is described for determining P in double acid (0.05N HCI + 0.025N H2SO4) and Bray P1 (0.025N HCI + 0.03N NH4F) soil extracts and K, Ca, and Mg in double acid and 1N ammonium acetate soil extracts. Comparisons are made between double acid and Bray P1 soil extraction methods for removal of P from a Freehold sandy loam soil that had been differentially fertilized with P fertilizers. Comparisons are also made between the double acid and ammonium acetate soil extraction methods for removal of K, Ca, and Mg from the same soil that had been differentially fertilized and limed with K fertilizers and pulverized–dolomitic limestone, respectively. Comparisons are made between automated and atomic absorption determinations of K, Ca, and Mg in standard solutions and double acid and ammonium acetate soil extracts. Bray P1 soil extractant removed 30–73% more P than did the double acid soil extractant from Freehold sandy loam soil. Ammonium acetate extractant removed about 25% more K from soil than did the double acid extractant. Double acid soil extractant removed more Ca from the soil than did ammonium acetate extractant, particularly at high soil Ca levels. Greater amounts of Ca were found in both types of soil extracts by the automated than by atomic absorption techniques. Double acid extractant removed more Mg from soil than did ammonium acetate extractant. The 2 instrumentation methods produced similar results for Mg and K analyses of both soil extract types.

scholarly journals Complexometric titration with potenciometric indicator to determination of calcium and magnesium in soil extracts¹

2011 ◽  
Vol 35 (4) ◽  
pp. 1331-1336 ◽  
Author(s):  
Claudia Mara Pereira ◽  
Cristhiane Anete Neiverth ◽  
Shizuo Maeda ◽  
Marcela Guiotoku ◽  
Luziane Franciscon
Keyword(s):  
Flame Atomic Absorption Spectrometry ◽  
Calcium Ion ◽  
Analytical Techniques ◽  
Absorption Spectrometry ◽  
Selective Electrode ◽  
Soil Extracts ◽  
Complexometric Titration ◽  
Flame Atomic Absorption ◽  
Calcium And Magnesium

This study proposes a method of direct and simultaneous determination of the amount of Ca2+ and Mg2+ present in soil extracts using a Calcium Ion-Selective Electrode and by Complexometric Titration (ISE-CT). The results were compared to those obtained by conventional analytical techniques of Complexometric Titration (CT) and Flame Atomic Absorption Spectrometry (FAAS). There were no significant differences in the determination of Ca2+ and Mg2+ in comparison with CT and FAAS, at a 95 % confidence level. Additionally, results of this method were more precise and accurate than of the Interlaboratorial Control (IC).

Determination of Aluminum Ion Activity in Soil Extracts

1959 ◽  
Vol 23 (4) ◽  
pp. 266-269 ◽  
Author(s):  
W. L. Lindsay ◽  
Michael Peech ◽  
J. S. Clark
Keyword(s):  
Soil Extracts ◽  
Aluminum Ion ◽  
Ion Activity

Determination of Nitrates in Soil Extracts

1973 ◽  
Vol 37 (4) ◽  
pp. 660-660 ◽  
Author(s):  
C. G. Kowalenko ◽  
L. E. Lowe
Keyword(s):  
Soil Extracts

LC–MS/MS Determination of Apigenin in Rat Plasma and Application to Pharmacokinetic Study

2020 ◽  
Vol 21 ◽  
Author(s):  
Shixing Zhu ◽  
Jiayuan Zhang ◽  
Zhihua Lv ◽  
Mingming Yu
Keyword(s):  
Formic Acid ◽  
Pharmacokinetic Study ◽  
Ammonium Acetate ◽  
Rat Plasma ◽  
Biological Properties ◽  
Plasma Samples ◽  
Supply Rate ◽  
Natural Plant ◽  
Ammonium Acetate Buffer

Background: Apigenin, a natural plant flavone, has been shown to possess a variety of biological properties. Objective: In this report, a highly selective and sensitive LC-MS/MS method was developed and validated for the determination of apigenin in rat plasma. Methods: Analysts were separated on the HSS T3 column (1.8 μm 2.1×100 mm) using acetonitrile and 0.1% formic acid in 2 mM ammonium acetate buffer at a supply rate of 0.200 mL/min as eluent in gradient model. Results: Plasma samples were treated by protein precipitation using acetonitrile for the recovery ranging from 86.5% to 90.1% for apigenin. The calibration curves followed linearity in the concentration range of 0.50-500 ng/mL. The inter-day and intra-day precisions at different QC levels within 13.1% and the accuracies ranged from -10.6% to 8.6%. Conclusion: The assay has been successfully applied to the pharmacokinetic study of apigenin in rats.

scholarly journals Concurrent chromatographic determination of pseudoephedrine and loratadine from combination syrups and tablets

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Imad Osman Abu Reid
Keyword(s):  
Ammonium Acetate ◽  
Chemical Properties ◽  
Chromatographic Determination ◽  
Analytical Challenge ◽  
Intermediate Precision ◽  
Box Behnken Design ◽  
Complex Samples ◽  
System Suitability ◽  
Nonpolar Compounds

Abstract Background Chromatographic separation of polar and nonpolar compounds when presented in combined dosage forms has always been considered as great analytical challenge. Separation and retention of both polar and nonpolar compounds by the same stationary phase can be a useful approach for analyses of complex samples with such a difference in chemical properties. Loratadine (nonpolar) and pseudoephedrine (polar) are typical examples of this situation. Results The Box–Behnken design was used to optimize the separation process, an efficient separation of loratadine and pseudoephedrine was achieved within 6 min; employing a mixture of 16.0 mM ammonium acetate buffer (pH 4.5) and acetonitrile (23:77, v/v) as isocratic mobile phase, pumped at 1.0 mL/min through a Zorbax cyanopropyl column (250 mm × 4.6 mm, 5 μm), the analytes were detected at 250 nm. Under the same conditions, separation of sodium benzoate preservative co-formulated with the two analytes in syrup formulation was also achieved. The calibration curve demonstrated excellent linearity in the range of 24.6–123.2 μg/mL and 594.8–2974.0 μg/mL for loratadine and pseudoephedrine, respectively with determination coefficient (r2) > 0.999. Conclusion The method’s accuracy bias < 2.0%, repeatability and intermediate precision (%RSD < 2.0%) were verified. In addition, system suitability parameters were found within the acceptable limits. Satisfactory results were obtained upon the application of the validated method to the analysis of commercial tablet and syrup formulations.

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